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  • 深圳市宗天技术开发有限公司

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  • 深圳市芯脉实业有限公司

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  • 深圳市隆亿诚科技有限公司

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  • UC2854DWTR
  • 数量3219 
  • 厂家Texas Instruments 
  • 封装16-SOIC(0.295,7.50mm 宽) 
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  • 数量3294 
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  • 数量4000 
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  • 深圳市晶美隆科技有限公司

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  • 数量13510 
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  • 深圳市晶美隆科技有限公司

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  • 数量18836 
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  • 深圳市拓亿芯电子有限公司

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  • 数量30000 
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  • 深圳市华斯顿电子科技有限公司

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  • 数量24461 
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  • 深圳市华斯顿电子科技有限公司

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  • 数量12500 
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  • 深圳市西源信息科技有限公司

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  • 数量8800 
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  • 北京齐天芯科技有限公司

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  • 数量15000 
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  • 深圳市中杰盛科技有限公司

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  • 数量12000 
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  • 深圳市正信鑫科技有限公司

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  • 数量4000 
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  • 深圳市芯福林电子有限公司

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  • UC2854DWTR
  • 数量36000 
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  • 深圳市毅创腾电子科技有限公司

     该会员已使用本站16年以上
  • UC2854DWTR
  • 数量4025 
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  • 深圳市惊羽科技有限公司

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  • UC2854DWTR
  • 数量6328 
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  • 深圳市硅诺电子科技有限公司

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  • 数量51287 
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  • 深圳市羿芯诚电子有限公司

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  • 数量8800 
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  • 数量90000 
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  • 上海磐岳电子有限公司

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  • 数量5800 
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  • 深圳市欧昇科技有限公司

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  • 数量9000 
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  • 深圳市宗天技术开发有限公司

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  • 数量21000 
  • 厂家Texas Instruments 
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产品型号UC2854DWTR的概述

芯片UC2854DWTR的概述 UC2854DWTR是一款由德州仪器(Texas Instruments)公司设计和制造的高性能PWM(脉宽调制)控制器。这款芯片广泛应用于光伏逆变器、电源管理系统、开关模式电源(SMPS)等领域。它以其高效、稳定的工作性能受到电源工程师的广泛青睐。UC2854DWTR采用了最新的控制算法,能够实现对电流的精确控制,从而显著提升系统的整体效率。 该芯片的工作电压范围广泛,能够适应不同电源的需求,并支持专用的电流限制和软启动功能。这些特性使得UC2854DWTR在现代电源设计中具有重要意义。同时,该芯片还具有多种保护机制,如过压、欠压、过流等,确保系统在各种工况下的安全运行。 芯片UC2854DWTR的详细参数 UC2854DWTR具有以下主要参数: 1. 电源电压范围:10V至30V,适合多种电源设计要求。 2. 最大输出电流:1A,能够驱动大多数功率M...

产品型号UC2854DWTR的Datasheet PDF文件预览

UC1854  
UC2854  
UC3854  
High Power Factor Preregulator  
FEATURES  
DESCRIPTION  
Control Boost PWM to 0.99 Power Factor  
The UC1854 provides active power factor correction for power sys-  
tems that otherwise would draw non-sinusoidal current from sinusoi-  
dal power lines. This device implements all the control functions  
necessary to build a power supply capable of optimally using available  
power-line current while minimizing line-current distortion. To do this,  
the UC1854 contains a voltage amplifier, an analog multiplier/divider,  
a current amplifier, and a fixed-frequency PWM. In addition, the  
UC1854 contains a power MOSFET compatible gate driver, 7.5V ref-  
erence, line anticipator, load-enable comparator, low-supply detector,  
and over-current comparator.  
Limit Line Current Distortion To <5%  
World-Wide Operation Without Switches  
Feed-Forward Line Regulation  
Average Current-Mode Control  
Low Noise Sensitivity  
Low Start-Up Supply Current  
Fixed-Frequency PWM Drive  
Low-Offset Analog Multiplier/Divider  
1A Totem-Pole Gate Driver  
The UC1854 uses average current-mode control to accomplish fixed-  
frequency current control with stability and low distortion. Unlike peak  
current-mode, average current control accurately maintains sinusoidal  
line current without slope compensation and with minimal response to  
noise transients.  
The UC1854’s high reference voltage and high oscillator amplitude  
minimize noise sensitivity while fast PWM elements permit chopping  
frequencies above 200kHz. The UC1854 can be used in single and  
three phase systems with line voltages that vary from 75 to 275 volts  
and line frequencies across the 50Hz to 400Hz range. To reduce the  
burden on the circuitry that supplies power to this device, the UC1854  
features low starting supply current.  
Precision Voltage Reference  
These devices are available packaged in 16-pin plastic and ceramic  
dual in-line packages, and a variety of surface-mount packages.  
BLOCK DIAGRAM  
UDG-92055  
6/98  
UC1854  
UC2854  
UC3854  
ABSOLUTE MAXIMUM RATINGS  
Supply Voltage VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V  
GT Drv Current, Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A  
GT Drv Current, 50% Duty Cycle. . . . . . . . . . . . . . . . . . . . . . . . . 1.5A  
Input Voltage, VSENSE, VRMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11V  
Input Voltage, ISENSE, Mult Out . . . . . . . . . . . . . . . . . . . . . . . . . . . 11V  
Input Voltage, PKLMT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V  
Input Current, RSET, IAC, PKLMT, ENA . . . . . . . . . . . . . . . . . . . 10mA  
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W  
Storage Temperature . . . . . . . . . . . . . . . . . . . . –65oC to +150oC  
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . . . . . +300oC  
Note 1: All voltages with respect to Gnd (Pin 1).  
Note 2: All currents are positive into the specified termi-  
nal.  
Note 3: ENA input is internally clamped to approximately  
14V.  
Note 4: Consult Unitrode Integrated Circuits databook for  
information regarding thermal specifications and limita-  
CONNECTION DIAGRAMS  
PACKAGE PIN FUNCTION  
DIL–16 & SOIC-16  
(Top View)  
J, N & DW Packages  
PLCC-20 & LCC-20  
(Top View)  
Q & L Packages  
FUNCTION  
N/C  
PIN  
1
Gnd  
2
PKLMT  
CA Out  
ISENSE  
N/C  
Mult Out  
IAC  
VA Out  
VRMS  
N/C  
VREF  
ENA  
VSENSE  
RSET  
N/C  
SS  
CT  
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
VCC  
GT Drv  
Unless otherwise stated, VCC=18V, RSET=15k to ground, CT=1.5nF to ground, PKLMT=1V, ENA=7.5V,  
VRMS=1.5V, IAC=100µA, ISENSE=0V, CA Out=3.5V, VA Out=5V, VSENSE=7.5V, no load on SS, CA Out,  
VA Out, REF, GT Drv, –55oC<TA<125oC for the UC1854, –40oC<TA<85oC for the UC2854, and  
0oC<TA<70oC for the UC3854, and TA=TJ.  
ELECTRICAL  
CHARACTERISTICS  
PARAMETER  
OVERALL  
TEST CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
Supply Current, Off  
ENA=0V  
1.5  
10  
2.0  
16  
mA  
mA  
V
Supply Current, On  
VCC Turn-On Threshold  
VCC Turn-Off Threshold  
ENA Threshold, Rising  
ENA Threshold Hysteresis  
ENA Input Current  
14.5  
9
16  
17.5  
11  
10  
V
2.4  
2.55  
0.25  
–0.2  
–.01  
2.7  
0.3  
5.0  
1.0  
V
0.2  
V
ENA=0V  
VRMS=5V  
–5.0  
–1.0  
µA  
µA  
VRMS Input Current  
VOLTAGE AMPLIFIER  
Voltage Amp Offset Voltage  
VSENSE Bias Current  
Voltage Amp Gain  
VA Out=5V  
–8  
–500  
70  
8
mV  
nA  
dB  
V
–25  
100  
500  
Voltage Amp Output Swing  
0.5 to 5.8  
–20  
Voltage Amp Short Circuit Current VA Out=0V  
SS Current SS=2.5V  
–36  
–20  
–5  
–6  
mA  
µA  
–14  
2
UC1854  
UC2854  
UC3854  
Unless otherwise stated, VCC=18V, RSET=15k to ground, CT=1.5nF to ground, PKLMT=1V, ENA=7.5V,  
VRMS=1.5V, IAC=100µA, ISENSE=0V, CA Out=3.5V, VA Out=5V, VSENSE=7.5V, no load on SS, CA Out,  
VA Out, REF, GT Drv, –55oC<TA<125oC for the UC1854, –40oC<TA<85oC for the UC2854, and  
0oC<TA<70oC for the UC3854, and TA=TJ.  
ELECTRICAL  
CHARACTERISTICS  
PARAMETER  
CURRENT AMPLIFIER  
TEST CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
Current Amp Offset Voltage  
ISENSE Bias Current  
–4  
–500  
4
mV  
nA  
V
–120  
500  
Input Range, ISENSE, Mult Out  
Current Amp Gain  
–0.3 to 2.5  
80  
110  
0.5 to 16  
–20  
dB  
V
Current Amp Output Swing  
Current Amp Short Circuit Current CA Out=0V  
–36  
400  
–5  
mA  
kHz  
Current Amp Gain-BW Product  
REFERENCE  
TA=25oC (Note 6)  
IREF=0mA, TA=25oC  
800  
Reference Output Voltage  
7.4  
7.35  
–15  
–10  
–50  
7.5  
7.5  
5
7.6  
7.65  
15  
V
IREF=0mA, Over Temp.  
–10mA<IREF<0mA  
15V<VCC<35V  
V
VREF Load Regulation  
VREF Line Regulation  
VREF Short Circuit Current  
MULTIPLIER  
mV  
mV  
mA  
2
10  
REF=0V  
–28  
–12  
Mult Out Current IAC Limited  
Mult Out Current Zero  
Mult Out Current RSET Limited  
Mult Out Current  
IAC=100µA, RSET=10k, VRMS=1.25V  
IAC=0µA, RSET=15k  
–220  
–2.0  
–280  
–50  
–200  
–0.2  
–255  
–42  
–180  
2.0  
µA  
µA  
µA  
µA  
µA  
µA  
µA  
µA  
V
IAC=450µA, RSET=15k, VRMS=1V, VA Out = 6V  
IAC=50µA, VRMS=2V, VA=4V  
IAC=100µA, VRMS=2V, VA=2V  
IAC=200µA, VRMS=2V, VA=4V  
IAC=300µA, VRMS=1V, VA=2V  
IAC=100µA, VRMS=1V, VA=2V  
(Note 5)  
–220  
–33  
–38  
–27  
–12  
–165  
–250  
–95  
–150  
–225  
–80  
–105  
–150  
–60  
Multiplier Gain Constant  
OSCILLATOR  
–1.0  
Oscillator Frequency  
RSET=15k  
RSET=8.2k  
46  
86  
55  
102  
5.4  
1.1  
62  
118  
5.9  
1.3  
kHz  
kHz  
V
CT Ramp Peak-to-Valley Amplitude  
CT Ramp Valley Voltage  
GATE DRIVER  
4.9  
0.8  
V
Maximum GT Drv Output Voltage 0mA load on GT Drv, 18V<VCC<35V  
13  
12  
14.5  
12.8  
0.9  
1.0  
0.1  
1.0  
35  
18  
V
V
GT Drv Output Voltage High  
GT Drv Output Voltage Low, Off  
GT Drv Output Voltage Low  
–200mA load on GT Drv, VCC=15V  
VCC=0V, 50mA load on GT Drv  
200mA load on GT Drv  
10mA load on GT Drv  
1.5  
2.2  
0.4  
V
V
V
Peak GT Drv Current  
GT Drv Rise/Fall Time  
GT Drv Maximum Duty Cycle  
CURRENT LIMIT  
10nF from GT Drv to Gnd  
1nF from GT Drv to Gnd  
VCA Out=7V  
A
ns  
%
95  
PKLMT Offset Voltage  
PKLMT Input Current  
PKLMT to GT Drv Delay  
–10  
10  
mV  
µA  
ns  
PKLMT=–0.1V  
–200  
–100  
175  
PKLMT falling from 50mV to –50mV  
k × IAC × (VA Out1)  
IMult Out =  
Note 5: Multiplier Gain Constant (k) is defined by:  
2
VRMS  
Note 6: Guaranteed by design. Not 100% tested in production.  
3
UC1854  
UC2854  
UC3854  
PIN DESCRIPTIONS  
(Pin Numbers Refer to DIL Packages)  
Gnd (Pin 1) (ground): All voltages are measured with re- VRMS (Pin 8) (RMS line voltage): The output of a boost  
spect to Gnd. VCC and REF should be bypassed directly PWM is proportional to the input voltage, so when the line  
voltage into a low-bandwidth boost PWM voltage regula-  
tor changes, the output will change immediately and  
slowly recover to the regulated level. For these devices,  
the VRMS input compensates for line voltage changes if it  
is connected to a voltage proportional to the RMS input  
line voltage. For best control, the VRMS voltage should  
stay between 1.5V and 3.5V.  
to Gnd with an 0.1µF or larger ceramic capacitor. The tim-  
ing capacitor discharge current also returns to this pin, so  
the lead from the oscillator timing capacitor to Gnd should  
also be as short and as direct as possible.  
PKLMT (Pin 2) (peak limit): The threshold for PKLMT is  
0.0V. Connect this input to the negative voltage on the  
current sense resistor as shown in Figure 1. Use a resis-  
tor to REF to offset the negative current sense signal up  
to Gnd.  
REF (Pin 9) (voltage reference output): REF is the output  
of an accurate 7.5V voltage reference. This output is ca-  
pable of delivering 10mA to peripheral circuitry and is in-  
ternally short circuit current limited. REF is disabled and  
will remain at 0V when VCC is low or when ENA is low.  
CA Out (Pin 3) (current amplifier output): This is the out-  
put of a wide-bandwidth op amp that senses line current  
and commands the pulse width modulator (PWM) to force  
the correct current. This output can swing close to Gnd,  
allowing the PWM to force zero duty cycle when neces-  
Bypass REF to Gnd with an 0.1µF or larger ceramic ca-  
pacitor for best stability.  
sary. The current amplifier will remain active even if the IC ENA (Pin 10) (enable): ENA is a logic input that will en-  
is disabled. The current amplifier output stage is an NPN able the PWM output, voltage reference, and oscillator.  
emitter follower pull-up and an 8k resistor to ground.  
ENA also will release the soft start clamp, allowing SS to  
rise. When unused, connect ENA to a +5V supply or pull  
ENA high with a 22k resistor. The ENA pin is not intended  
to be used as a high speed shutdown to the PWM output.  
ISENSE (Pin 4) (current sense minus): This is the inverting  
input to the current amplifier. This input and the non-in-  
verting input Mult Out remain functional down to and be-  
low Gnd. Care should be taken to avoid taking these  
V
SENSE  
(Pin 11) (voltage amplifier inverting input): This is  
inputs below –0.5V, because they are protected with di- normally connected to a feedback network and to the  
odes to Gnd. boost converter output through a divider network.  
Mult Out (Pin 5) (multiplier output and current sense RSET (Pin 12) (oscillator charging current and multiplier  
plus): The output of the analog multiplier and the non-in- limit set): A resistor from RSET to ground will program os-  
verting input of the current amplifier are connected to- cillator charging current and maximum multiplier output.  
gether at Mult Out. The cautions about taking ISENSE Multiplier output current will not exceed 3.75V divided by  
below –0.5V also apply to Mult Out. As the multiplier out- the resistor from RSET to ground.  
put is a current, this is a high impedance input similar to  
SS (Pin 13) (soft start): SS will remain at Gnd as long as  
ISENSE, so the current amplifier can be configured as a  
the IC is disabled or VCC is too low. SS will pull up to over  
differential amplifier to reject Gnd noise. Figure 1 shows  
8V by an internal 14µA current source when both VCC be-  
an example of using the current amplifier differentially.  
comes valid and the IC is enabled. SS will act as the ref-  
IAC (Pin 6) (input AC current): This input to the analog  
multiplier is a current. The multiplier is tailored for very  
low distortion from this current input (IAC) to Mult Out, so  
this is the only multiplier input that should be used for  
sensing instantaneous line voltage. The nominal voltage  
on IAC is 6V, so in addition to a resistor from IAC to recti-  
fied 60Hz, connect a resistor from IAC to REF. If the resis-  
tor to REF is one fourth of the value of the resistor to the  
rectifier, then the 6V offset will be cancelled, and the line  
current will have minimal cross-over distortion.  
erence input to the voltage amplifier if SS is below REF.  
With a large capacitor from SS to Gnd, the reference to  
the voltage regulating amplifier will rise slowly, and in-  
crease the PWM duty cycle slowly. In the event of a dis-  
able command or a supply dropout, SS will quickly  
discharge to ground and disable the PWM.  
CT (Pin 14) (oscillator timing capacitor): A capacitor from  
CT to Gnd will set the PWM oscillator frequency accord-  
ing to this relationship:  
1.25  
F =  
VA Out (Pin 7) (voltage amplifier output): This is the out-  
put of the op amp that regulates output voltage. Like the  
current amplifier, the voltage amplifier will stay active  
even if the IC is disabled with either ENA or VCC. This  
means that large feedback capacitors across the amplifier  
will stay charged through momentary disable cycles. Volt-  
age amplifier output levels below 1V will inhibit multiplier  
output. The voltage amplifier output is internally limited to  
approximately 5.8V to prevent overshoot. The voltage  
amplifier output stage is an NPN emitter follower pull-up  
and an 8k resistor to ground.  
RSET × CT  
VCC (Pin 15) (positive supply voltage): Connect VCC to a  
stable source of at least 20mA above 17V for normal op-  
eration. Also bypass VCC directly to Gnd to absorb supply  
current spikes required to charge external MOSFET gate  
capacitances. To prevent inadequate GT Drv signals,  
these devices will be inhibited unless VCC exceeds the  
upper under-voltage lockout threshold and remains  
above the lower threshold.  
4
UC1854  
UC2854  
UC3854  
PIN DESCRIPTIONS (cont.)  
GT Drv (Pin 16) (gate drive): The output of the PWM is a pedance and the GT Drv output driver that might cause  
totem pole MOSFET gate driver on GT Drv. This output is the GT Drv output to overshoot excessively. Some over-  
internally clamped to 15V so that the IC can be operated shoot of the GT Drv output is always expected when driv-  
with VCC as high as 35V. Use a series gate resistor of at ing a capacitive load.  
least 5 ohms to prevent interaction between the gate im-  
TYPICAL CHARACTERISTICS at TA = TJ = 25°C  
Current Amplifier Gain and Phase vs Frequency  
Voltage Amplifier Gain and Phase vs Frequency  
120  
120  
Phase  
Margin  
Phase  
Margin  
100  
100  
80  
60  
40  
20  
0
80  
60  
40  
20  
0
degrees  
degrees  
Open-Loop  
Gain  
Open-Loop  
Gain  
dB  
dB  
-20  
-20  
0.1  
1
10  
100  
1000  
10000  
0.1  
1
10  
100  
1000  
10000  
Frequency  
kHz  
Frequency  
kHz  
Gate Drive Rise and Fall Time  
Gate Drive Maximum Duty Cycle  
700  
600  
500  
100%  
95%  
90%  
Rise Time  
Fall Time  
400  
ns  
Duty  
85%  
Cycle  
300  
200  
100  
0
80%  
75%  
70%  
1
10  
100  
0
0.01  
0.02  
0.03  
0.04  
0.05  
R
SET, k  
Load Capacitance,  
µF  
Multiplier Output vs Voltage on Mult  
Oscillator Frequency vs RSET and CT  
1000  
600  
500  
Mult Out=3V  
Mult Out=2V  
Mult Out=1  
Mult Out=0V  
400  
100pF  
Frequency  
Multiplier  
Output  
µA  
kHz  
100  
200pF  
500pF  
300  
200  
VRMS=2V, VA Out=5V  
1nF  
2nF  
100  
0
5nF  
3nF  
10nF  
10  
10  
1
100  
0
100 200 300 400 500 600 700  
AC, µA  
800  
I
RSET, k  
5
UC1854  
UC2854  
UC3854  
o
TYPICAL CHARACTERISTICS at TA = TJ = 25 C (cont.)  
Multiplier Output vs Multiplier Inputs with Mult Out=0V  
250  
600  
500  
400  
V
RMS=1.5V  
VRMS=3V  
VA Out=5V  
200  
150  
VA Out=3.5V  
VA Out=3V  
300  
Mult Out  
VA Out=2.5V  
VA Out=1.25V  
Mult Out  
µA  
100  
µA  
200  
VA Out=2V  
50  
0
100  
0
VA Out=1.25V  
0
100  
200  
300  
400  
500  
0
100  
200  
300  
AC, µA  
400  
500  
I
AC, µA  
I
140  
160  
140  
120  
100  
V
RMS=5V  
V
RMS=4V  
VA Out=5V  
120  
100  
VA Out=5V  
VA Out=4V  
VA Out=3V  
Mult Out  
80  
Mult Out,  
VA Out=3V  
80  
µA  
µA  
60  
60  
40  
VA Out=2V  
40  
VA Out=1.5V  
VA Out=1.25V  
20  
0
20  
0
0
0
100  
200  
IAC,  
300  
400  
500  
100  
200  
300  
µA  
400  
500  
µ
A
IAC,  
APPLICATIONS INFORMATION  
A 250W PREREGULATOR  
The circuit of Figure 1 shows a typical application of the  
UC3854 as a preregulator with high power factor and effi-  
ciency. The assembly consists of two distinct parts, the  
control circuit centering on the UC3854 and the power  
section.  
The power section is a "boost" converter, with the induc-  
tor operating in the continuous mode. In this mode, the  
duty cycle is dependent on the ratio between input and  
output voltages; also, the input current has low switching  
frequency ripple, which means that the line noise is low.  
Furthermore, the output voltage must be higher than the  
peak value of the highest expected AC line voltage, and  
all components must be rated accordingly.  
cycle of this output is simultaneously controlled by four  
separate inputs to the chip:  
INPUT  
PIN #  
FUNCTION  
VSENSE........................11 .......... Output DC Voltage  
IAC.................................6 .......... LineVoltage Waveform  
ISENSE/Mult Out .........4/5 .......... Line Current  
VRMS.............................8 .......... RMS Line Voltage  
Additional controls of an auxiliary nature are provided.  
They are intended to protect the switching power MOS-  
FETS from certain transient conditions, as follows:  
INPUT  
PIN #  
FUNCTION  
ENA ............................10 .......... Start-Up Delay  
SS...............................13 .......... Soft Start  
PKLIM...........................2 .......... Maximum Current Limit  
In the control section, the UC3854 provides PWM pulses  
(GT Drv, Pin 16) to the power MOSFET gate. The duty  
6
UC1854  
UC2854  
UC3854  
APPLICATIONS INFORMATION (cont.)  
PROTECTION INPUTS  
ISENSE/Mult Out (Line current): The voltage drop across  
the 0.25 ohm current-sense resistor is applied to pins 4  
and 5 as shown. The current-sense amplifier also oper-  
ates with high low-frequency gain, but unlike the voltage  
amplifier, it is set up to give the current-control loop a very  
wide bandwidth. This enables the line current to follow the  
line voltage as closely as possible. In the present exam-  
ple, this amplifier has a zero at about 500Hz, and a gain  
of about 18dB thereafter.  
ENA (Enable): The ENA input must reach 2.5 volts be-  
fore the REF and GT Drv outputs are enabled. This pro-  
vides a means to shut down the gate in case of trouble, or  
to add a time delay at power up. A hysteresis gap of  
200mV is provided at this terminal to prevent erratic op-  
eration. Undervoltage protection is provided directly at pin  
15, where the on/off thresholds are 16V and 10V. If the  
ENA input is unused, it should be pulled up to VCC  
through a current limiting resistor of 100k.  
VRMS (RMS line voltage): An important feature of the  
UC3854 preregulator is that it can operate with a three-to-  
one range of input line voltages, covering everything from  
low line in the US (85VAC) to high line in Europe  
(255VAC). This is done using line feedforward, which  
keeps the input power constant with varying input voltage  
(assuming constant load power). To do this, the multiplier  
divides the line current by the square of the RMS value of  
the line voltage. The voltage applied to pin 8, proportional  
to the average of the rectified line voltage (and propor-  
tional to the RMS value), is squared in the UC3854, and  
then used as a divisor by the multiplier block. The multi-  
plier output, at pin 5, is a current that increases with the  
current at pin 6 and the voltage at pins 7, and decreases  
with the square of the voltage at pin 8.  
SS (Soft start): The voltage at pin 13 (SS) can reduce  
the reference voltage used by the error amplifier to regu-  
late the output DC voltage. With pin 13 open, the refer-  
ence voltage is typically 7.5V. An internal current source  
delivers approximately -14µA from pin 13. Thus a capaci-  
tor connected between that pin and ground will charge  
linearly from zero to 7.5V in 0.54C seconds, with C ex-  
pressed in microfarads.  
PKLIM (Peak current limit): Use pin 2 to establish the  
highest value of current to be controlled by the power  
MOSFET. With the resistor divider values shown in Figure  
1, the 0.0V threshold at pin 2 is reached when the voltage  
drop across the 0.25 ohm current sense resistor is  
7.5V*2k/10k=1.5V, corresponding to 6A. A bypass capaci-  
tor from pin 2 to ground is recommended to filter out very  
high frequency noise.  
PWM FREQUENCY: The PWM oscillator frequency in  
Figure 1 is 100kHz. This value is determined by CT at pin  
14 and RSET at pin 12. RSET should be chosen first be-  
cause it affects the maximum value of IMULT according to  
the equation:  
CONTROL INPUTS  
VSENSE (Output DC voltage sense): The threshold voltage  
for the VSENSE input is 7.5V and the input bias current is  
typically 50nA. The values shown in Figure 1 are for an  
output voltage of 400V DC. In this circuit, the voltage am-  
plifier operates with a constant low frequency gain for  
minimum output excursions. The 47nF feedback capacitor  
places a 15Hz pole in the voltage loop that prevents  
120Hz ripple from propagating to the input current.  
3.75V  
RSET  
IMULT  
=
MAX  
This effectively sets a maximum PWM-controlled current.  
With RSET=15k,  
3.75V  
15k  
IMULT  
=
= 250µA  
MAX  
IAC (Line waveform): In order to force the line current  
waveshape to follow the line voltage, a sample of the  
power line voltage in waveform is introduced at pin 6. This  
signal is multiplied by the output of the voltage amplifier in  
the internal multiplier to generate a reference signal for  
the current control loop.  
Also note that the multiplier output current will never ex-  
ceed twice IAC.  
With the 4k resistor from Mult Out to the 0.25 ohm current  
sense resistor, the maximum current in the current sense  
resistor will be  
This input is not a voltage, but a current (hence IAC). It is  
set up by the 220k and 910k resistive divider (see Figure  
1). The voltage at pin 6 is internally held at 6V, and the  
two resistors are chosen so that the current flowing into  
pin 6 varies from zero (at each zero crossing) to about  
400µA at the peak of the waveshape. The following for-  
mulas were used to calculate these resistors:  
IMULT  
×4k  
MAX  
IMAX  
=
= 4A  
0.25Ω  
Having thus selected RSET, the current sense resistor,  
and the resistor from Mult Out to the current sense resis-  
tor, calculate CT for the desired PWM oscillator frequency  
from the equation  
Vpk 260VAC × √2  
1.25  
CT =  
RAC  
=
=
= 910k  
IACpk  
400µA  
F × RSET  
RAC  
4
RREF  
=
= 220k  
(where Vpk is the peak line voltage)  
7
UC1854  
UC2854  
UC3854  
FIGURE 1 - Typical Application  
This diagram depicts a complete 250 Watt Preregulator. At full load, this preregulator will exhibit a power factor of 0.99  
at any power line voltage between 80 and 260 VRMS. This same circuit can be used at higher power levels with minor  
modifications to the power stage. See Design Note 39B and Application Note U-134 for further details.  
UDG-92056-1  
NOTE: Boost inductor can be fabricated with ARNOLD MPP toroidal core part number A-438381-2, using a 55 turn primary and a  
13 turn secondary.  
UNITRODE CORPORATION  
7 CONTINENTAL BLVD. MERRIMACK, NH 03054  
These products contain patented circuitry and are sold under license from Pioneer Magnetics, Inc.  
TEL. (603) 424-2410 FAX (603) 424-3460  
8
PACKAGE OPTION ADDENDUM  
www.ti.com  
20-Dec-2007  
PACKAGING INFORMATION  
Orderable Device  
Status (1)  
Package Package  
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)  
Qty  
Type  
Drawing  
5962-9326101M2A  
5962-9326101MEA  
UC1854J  
OBSOLETE TO/SOT  
L
J
20  
16  
16  
16  
20  
20  
16  
16  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
TBD  
Call TI  
A42 SNPB  
A42 SNPB  
A42 SNPB  
Call TI  
Call TI  
ACTIVE  
ACTIVE  
ACTIVE  
CDIP  
CDIP  
CDIP  
1
1
1
N / A for Pkg Type  
N / A for Pkg Type  
N / A for Pkg Type  
Call TI  
J
UC1854J883B  
UC1854L  
J
OBSOLETE TO/SOT  
OBSOLETE TO/SOT  
L
UC1854L883B  
UC2854BJ  
L
Call TI  
Call TI  
ACTIVE  
ACTIVE  
CDIP  
SOIC  
J
1
A42 SNPB  
N / A for Pkg Type  
UC2854DW  
DW  
40 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
UC2854DWG4  
UC2854DWTR  
UC2854DWTRG4  
UC2854N  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
SOIC  
SOIC  
SOIC  
PDIP  
PDIP  
SOIC  
SOIC  
SOIC  
SOIC  
SOIC  
PDIP  
PDIP  
PLCC  
PLCC  
PLCC  
PLCC  
DW  
DW  
DW  
N
16  
16  
16  
16  
16  
16  
16  
16  
16  
16  
16  
16  
20  
20  
20  
20  
40 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
25 Green (RoHS & CU NIPDAU N / A for Pkg Type  
no Sb/Br)  
UC2854NG4  
N
25 Green (RoHS & CU NIPDAU N / A for Pkg Type  
no Sb/Br)  
UC3854DW  
DW  
DW  
DW  
DW  
DW  
N
40 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
UC3854DWG4  
UC3854DWTR  
UC3854DWTR-FG4  
UC3854DWTRG4  
UC3854N  
40 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
25 Green (RoHS & CU NIPDAU N / A for Pkg Type  
no Sb/Br)  
UC3854NG4  
N
25 Green (RoHS & CU NIPDAU N / A for Pkg Type  
no Sb/Br)  
UC3854Q  
FN  
FN  
FN  
FN  
46 Green (RoHS &  
no Sb/Br)  
CU SN  
CU SN  
CU SN  
CU SN  
Level-2-260C-1 YEAR  
Level-2-260C-1 YEAR  
Level-2-260C-1 YEAR  
Level-2-260C-1 YEAR  
UC3854QG3  
UC3854QTR  
UC3854QTRG3  
46 Green (RoHS &  
no Sb/Br)  
1000 Green (RoHS &  
no Sb/Br)  
1000 Green (RoHS &  
no Sb/Br)  
(1) The marketing status values are defined as follows:  
ACTIVE: Product device recommended for new designs.  
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.  
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in  
a new design.  
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.  
OBSOLETE: TI has discontinued the production of the device.  
Addendum-Page 1  
PACKAGE OPTION ADDENDUM  
www.ti.com  
20-Dec-2007  
(2)  
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check  
http://www.ti.com/productcontent for the latest availability information and additional product content details.  
TBD: The Pb-Free/Green conversion plan has not been defined.  
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements  
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered  
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.  
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and  
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS  
compatible) as defined above.  
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame  
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)  
(3)  
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder  
temperature.  
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is  
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the  
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take  
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incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited  
information may not be available for release.  
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI  
to Customer on an annual basis.  
Addendum-Page 2  
PACKAGE MATERIALS INFORMATION  
www.ti.com  
11-Mar-2008  
TAPE AND REEL INFORMATION  
*All dimensions are nominal  
Device  
Package Package Pins  
Type Drawing  
SPQ  
Reel  
Reel  
A0 (mm)  
B0 (mm)  
K0 (mm)  
P1  
W
Pin1  
Diameter Width  
(mm) W1 (mm)  
(mm) (mm) Quadrant  
UC2854DWTR  
UC3854DWTR  
SOIC  
SOIC  
DW  
DW  
16  
16  
2000  
2000  
330.0  
330.0  
16.4  
16.4  
10.85  
10.85  
10.8  
10.8  
2.7  
2.7  
12.0  
12.0  
16.0  
16.0  
Q1  
Q1  
Pack Materials-Page 1  
PACKAGE MATERIALS INFORMATION  
www.ti.com  
11-Mar-2008  
*All dimensions are nominal  
Device  
Package Type Package Drawing Pins  
SPQ  
Length (mm) Width (mm) Height (mm)  
UC2854DWTR  
UC3854DWTR  
SOIC  
SOIC  
DW  
DW  
16  
16  
2000  
2000  
346.0  
346.0  
346.0  
346.0  
33.0  
33.0  
Pack Materials-Page 2  
IMPORTANT NOTICE  
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TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard  
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www.ti.com/wireless  
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配单直通车
UC2854DWTR产品参数
型号:UC2854DWTR
Brand Name:Texas Instruments
是否无铅: 不含铅
是否Rohs认证: 符合
生命周期:Active
IHS 制造商:TEXAS INSTRUMENTS INC
零件包装代码:SOIC
包装说明:SOP, SOP16,.4
针数:16
Reach Compliance Code:compliant
ECCN代码:EAR99
HTS代码:8542.39.00.01
Factory Lead Time:1 week
风险等级:0.75
模拟集成电路 - 其他类型:POWER FACTOR CONTROLLER
控制模式:CURRENT-MODE
控制技术:PULSE WIDTH MODULATION
最大输入电压:35 V
最小输入电压:15 V
标称输入电压:18 V
JESD-30 代码:R-PDSO-G16
JESD-609代码:e4
长度:10.285 mm
湿度敏感等级:2
功能数量:1
端子数量:16
最高工作温度:85 °C
最低工作温度:-40 °C
最大输出电流:1.5 A
最大输出电压:7.6 V
最小输出电压:7.4 V
标称输出电压:7.5 V
封装主体材料:PLASTIC/EPOXY
封装代码:SOP
封装等效代码:SOP16,.4
封装形状:RECTANGULAR
封装形式:SMALL OUTLINE
峰值回流温度(摄氏度):260
认证状态:Not Qualified
座面最大高度:2.65 mm
子类别:Switching Regulator or Controllers
最大供电电流 (Isup):10 mA
最大供电电压 (Vsup):30 V
标称供电电压 (Vsup):18 V
表面贴装:YES
切换器配置:BOOST
最大切换频率:118 kHz
技术:BIPOLAR
温度等级:INDUSTRIAL
端子面层:Nickel/Palladium/Gold (Ni/Pd/Au)
端子形式:GULL WING
端子节距:1.27 mm
端子位置:DUAL
处于峰值回流温度下的最长时间:NOT SPECIFIED
宽度:7.49 mm
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