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产品型号UC2843AQD8RQ1的概述

UC2843AQD8RQ1芯片概述 UC2843AQD8RQ1是一款高性能的电源管理集成电路,属于ON Semiconductor公司的一系列PWM(脉宽调制)控制器。被广泛应用于各种开关电源的设计中,如DC-DC转换器和电动机驱动等。该芯片不仅具备高效能的输出功率控制能力,还具有多种保护功能,以确保电源的稳定性和可靠性。 UC2843AQD8RQ1的详细参数 UC2843AQD8RQ1的工作电压范围为8V到30V,适合多种应用场景。其主要参数包括: - 启动电流:200 μA - 功率损耗:小于1W - 频率范围:可调频率,通常在100kHz到250kHz之间 - 最大输出电流:1A - 温度范围:-40°C至+85°C 此外,该芯片还支持脉宽调制技术,能够实现高效的转化和较小的输出纹波,使得电源系统达到更高的可靠性和稳定性。 厂家、包装及封装 UC2843AQD8RQ1由ON S...

产品型号UC2843AQD8RQ1的Datasheet PDF文件预览

UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ  
CURRENT-MODE PWM CONTROLLER  
SGLS164 – APRIL 2003  
D 8-PIN PACKAGE  
(TOP VIEW)  
D
D
Extended Temperature Performance of  
–40°C to 125°C  
Optimized for Off-line and DC to DC  
Converters  
COMP  
V
V
1
2
3
4
8
7
6
5
REF  
CC  
V
FB  
D
D
D
D
D
D
D
D
D
D
D
Low Start Up Current (<0.5 mA)  
Trimmed Oscillator Discharge Current  
Automatic Feed Forward Compensation  
Pulse-by-Pulse Current Limiting  
Enhanced Load Response Characteristics  
Under-Voltage Lockout With Hysteresis  
Double Pulse Suppression  
I
OUTPUT  
GND  
SENSE  
R /C  
T
T
D 14-PIN PACKAGE  
(TOP VIEW)  
COMP  
NC  
V
REF  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
NC  
V
V
High Current Totem Pole Output  
Internally Trimmed Bandgap Reference  
500 kHz Operation  
FB  
NC  
CC  
V
C
I
OUTPUT  
GND  
SENSE  
NC  
Low R Error Amp  
O
R /C  
PWR GND  
8
T
T
description  
The UC2842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC2842/3/4/5  
family. Providing the necessary features to control current mode switched mode power supplies, this family has the  
following improved features. Start up current is guaranteed to be less than 0.5 mA. Oscillator discharge is trimmed  
to 8.3 mA. During under voltage lockout, the output stage can sink at least 10 mA at less than 1.2 V for V  
5 V.  
over  
CC  
The difference between members of this family are shown in the table below.  
PART NUMBER  
UC2842A  
UVLO ON  
16 V  
UVLO OFF  
10 V  
MAXIMUM DUTY CYCLE  
<100%  
<100%  
<50%  
UC2843A  
8.5 V  
7.9 V  
UC2844A  
16 V  
10 V  
UC2845A  
8.5 V  
7.9 V  
<50%  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
Copyright 2003, Texas Instruments Incorporated  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ  
CURRENT-MODE PWM CONTROLLER  
SGLS164 APRIL 2003  
ORDERING INFORMATION  
ORDERABLE  
PART NUMBER  
TOP-SIDE  
MARKING  
PACKAGE  
T
A
SOIC-8 D8  
SOIC-8 D8  
SOIC-14 D  
SOIC-14 D  
SOIC-8 D8  
SOIC-8 D8  
SOIC-14 D  
SOIC-14 D  
SOIC-8 D8  
SOIC-8 D8  
SOIC-14 D  
SOIC-14 D  
SOIC-8 D8  
SOIC-8 D8  
SOIC-14 D  
SOIC-14 D  
Tape and reel  
Tube  
UC2842AQD8R  
UC2842AQD8  
UC2842AQDR  
UC2842AQD  
2842AQ  
2842AQ  
2842AQ  
2842AQ  
2843AQ  
2843AQ  
2843AQ  
2843AQ  
2844AQ  
2844AQ  
2844AQ  
2844AQ  
2845AQ  
2845AQ  
2845AQ  
2845AQ  
Tape and reel  
Tube  
Tape and reel  
Tube  
UC2843AQD8R  
UC2843AQD8  
UC2843AQDR  
UC2843AQD  
Tape and reel  
Tube  
40°C to 125°C  
Tape and reel  
Tube  
UC2844AQD8R  
UC2844AQD8  
UC2844AQDR  
UC2844AQD  
Tape and reel  
Tube  
Tape and reel  
Tube  
UC2845AQD8R  
UC2845AQD8  
UC2845AQDR  
UC2845AQD  
Tape and reel  
Tube  
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines  
are available at www.ti.com/sc/package.  
block diagram  
NOTES: 1. A = DIL-8 Pin Number. B = SO-14 Pin Number.  
2. Toggle flip flop used only in 2844A and 2845A.  
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ  
CURRENT-MODE PWM CONTROLLER  
SGLS164 APRIL 2003  
Ordering Information  
UC 284  
4
A
Q
D
R
TAPE and REEL INDICATOR  
PACKAGE  
D
= Plastic SOIC, 14 pin  
D8 = Plastic SOIC, 8 pin  
AUTOMOTIVE TEMPERATURE RANGE INDICATOR  
IMPROVED PERFORMANCE INDICATOR  
PRODUCT OPTION  
2 through 5  
3
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ  
CURRENT-MODE PWM CONTROLLER  
SGLS164 APRIL 2003  
†‡  
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)  
V
V
voltage (low impedance source) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 V  
CC  
CC  
voltage (I  
mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . self limiting  
CC  
Output current, I  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1 A  
O
Output energy (capacitive load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 µJ  
Analog Inputs (pins 3, 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to 6.3 V  
Error Amp Output Sink current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA  
Power Dissipation at T < +25_C (D package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 W  
A
Package thermal impedance, θ (see Note 1): D (8-pin) package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W  
JA  
Storage temperature range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65_C to 150_C  
stg  
Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . 260_C  
Stresses beyond those listed under absolute maximum ratingsmay cause permanent damage to the device. These are stress ratings only, and  
functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditionsis not implied.  
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.  
Unless otherwise indicated, voltages are reference to ground and currents are positive into and negative out of the specified terminals.  
NOTE 1: Long term hightemperature storage and/or extended use at maximum recommended operating conditions may result in a reduction of  
overall device life. See http://www.ti.com/ep_quality for additional information on enhanced plastic packaging.  
electrical characteristics, T = 40_C to 125_C, V  
= 15 V (see Note 1), R = 10 k, C = 3.3 nF, and  
T T  
A
CC  
T = T (unless otherwise stated)  
A
J
PARAMETER  
TEST CONDITIONS  
MIN  
TYP  
MAX UNITS  
Reference Section  
Output voltage  
4.95  
5.0  
6
5.05  
20  
V
T = 25_C,  
I
O
= 1 mA  
J
Line regulation voltage  
Load regulation voltage  
Temperature stability  
Total output variation voltage  
V
IN  
= 12 V to 25 V  
mV  
mV  
I
O
= 1 mA to 20 mA  
6
25  
See Notes 2 and 3  
Line, Load, Temp.  
0.2  
0.4 mV/_C  
5.1  
4.9  
V
f = 10 Hz to 10 kHz,  
See Note 2  
Output noise voltage  
T = 25_C  
J
50  
µV  
Long term stability  
Output short-circuit current  
Oscillator Section  
Initial accuracy  
1000 hours,  
See Note 2  
T
= 125_C  
5
25  
mV  
mA  
A
30  
100  
180  
See Note 4  
T = 25_C  
J
47  
52  
0.2  
5
57  
1
kHz  
%
Voltage stability  
V
= 12 V to 25 V  
CC  
= MIN to MAX, See Note 2  
Temperature stability  
Amplitude peak-to-peak  
T
A
%
V pin 7,  
See Note 2  
1.7  
8.3  
V
T = 25_C  
7.8  
7.5  
8.8  
8.8  
J
Discharge current  
V pin 7 = 2 V,  
See Note 5  
mA  
T = Full range  
J
4
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ  
CURRENT-MODE PWM CONTROLLER  
SGLS164 APRIL 2003  
electrical characteristics, T = 40_C to 125_C, V  
= 15 V (see Note 1), R = 10 k, C = 3.3 nF, and  
A
CC  
T
T
T = T (unless otherwise stated)  
A
J
PARAMETER  
TEST CONDITIONS  
MIN  
TYP  
MAX UNITS  
Error Amplifier Section  
Input voltage  
COMP = 2.5 V  
2.45  
2.5  
0.3  
90  
2.55  
V
µA  
dB  
MHz  
dB  
mA  
mA  
V
Input bias current  
Open loop voltage gain (A  
Unity gain bandwidth  
PSRR  
1  
V
O
= 2 V to 4 V  
65  
0.7  
60  
VOL)  
See Note 2  
= 12 V to 25 V  
T = 25_C  
1
J
V
CC  
70  
Output sink current  
Output source current  
FB = 2.7 V,  
FB = 2.3 V,  
FB = 2.3 V,  
FB = 2.7 V,  
COMP = 1.1 V  
COMP = 5 V  
2
6
0.5  
5
0.8  
6
V
V
high  
low  
R
R
= 15 kto GND  
OUT  
L
L
= 15 kto V  
0.7  
1.1  
V
OUT  
REF  
Current Sense Section  
Gain  
See Notes 6 and 7  
COMP = 5 V,  
2.85  
0.9  
3
1
3.15  
1.1  
V/V  
V
Maximum input signal  
PSRR  
See Note 6  
V
CC  
= 12 V to 25 V,See Note 6  
70  
2  
150  
dB  
µA  
ns  
Input bias current  
Delay to output  
Output Section (OUT)  
10  
I
= 0 V to 2 V,  
See Note 2  
300  
SENSE  
I
I
I
I
= 20 mA  
0.1  
15  
0.4  
2.2  
OUT  
OUT  
OUT  
OUT  
Low-level output voltage  
High-level output voltage  
V
V
= 200 mA  
= 20 mA  
13  
12  
13.5  
13.5  
50  
= 200 mA  
Rise time  
C
C
= 1 nF,  
See Note 2  
See Note 2  
T = 25_C  
J
150  
150  
1.2  
ns  
ns  
V
L
J
Fall time  
= 1 nF,  
T = 25_C  
50  
L
UVLO saturation  
V
= 5 V,  
I
= 10 mA  
OUT  
0.7  
CC  
Undervoltage Lockout Section  
UC2842A,  
UC2844A  
15  
7.8  
9
16  
8.4  
10  
17  
9
Start threshold  
V
V
UC2843A,  
UC2845A  
UC2842A,  
UC2844A  
11  
8.2  
Minimum operation voltage after turn on  
UC2843A,  
UC2845A  
7
7.6  
5
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ  
CURRENT-MODE PWM CONTROLLER  
SGLS164 APRIL 2003  
electrical characteristics, T = 40_C to 125_C, V  
= 15 V (see Note 1), R = 10 k, C = 3.3 nF, and  
T T  
A
CC  
T = T (unless otherwise stated)  
A
J
PARAMETER  
TEST CONDITIONS  
MIN  
TYP  
MAX UNITS  
PWM Section  
UC2842A, UC2843A  
UC2844A, UC2845A  
94  
96  
48  
100  
%
Maximum duty cycle  
47  
50  
Minimum duty cycle  
Total Standby Current  
Start-up current  
0
%
0.3  
11  
0.5  
17  
mA  
mA  
V
Operating supply current  
FB = 0 V,  
= 25 mA  
SENSE = 0 V  
V
internal zener voltage  
I
30  
34  
CC  
NOTES: 1. Adjust V  
CC  
above the start threshold before setting at 15 V.  
CC  
2. Not production tested.  
3. Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation:  
.V (max)andV (min)arethemaximumandminimumreferencevoltagemeasured  
V
(max) V  
(min)  
T (max) T (min)  
REF  
REF  
REF  
REF  
Temp Stability =  
J
J
over the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the extremes in temperature.  
4. Output frequency equals oscillator frequency for the UC2842A and UC2843A. Output frequency is one half oscillator frequency for the  
UC2844A and UC2845A.  
5. This parameter is measured with R = 10 kto V  
. This contributes approximately 300 µA of current to the measurement. The total  
T
REF  
current flowing into the R  
6. Parameter measured at trip point of latch with V  
pin will be approximately 300 µA higher than the measured value.  
T/C  
at 0 V.  
v 0.8 V.  
FB  
7. Gain is defined by:  
; 0 v V  
DV  
SENSE  
COMP  
DV  
SENSE  
A =  
PA  
RAMETER MEASUREMENT INFORMATION  
Error Amp can source and sink up to 0.5 mA, and sink up to 2 mA.  
Figure 1. Error Amp Configuration  
6
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ  
CURRENT-MODE PWM CONTROLLER  
SGLS164 APRIL 2003  
PARAMETER MEASUREMENT INFORMATION  
During UVLO, the Output is low.  
Figure 2. Under Voltage Lockout  
Peak Current (Is) is Determined By The Formula:  
1.0V  
RS  
IsmaxȀ  
A small RC filter may be required to supress switch transients.  
Figure 3. Current Sense Circuit  
7
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ  
CURRENT-MODE PWM CONTROLLER  
SGLS164 APRIL 2003  
PARAMETER MEASUREMENT INFORMATION  
Error Amplifier Open-Loop Frequency Response  
Output Saturation Characteristics  
Figure 5  
Figure 4  
AP  
PLICATION INFORMATION  
Oscillator Frequency vs Timing Resistance  
Maximum Duty Cycle vs Timing Resistor  
Figure 6. Oscillator  
8
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ  
CURRENT-MODE PWM CONTROLLER  
SGLS164 APRIL 2003  
APPLICATION INFORMATION  
High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be  
connected close to pin 5 in a single point ground. The transistor and 5k potentiometer are used to sample the oscillator waveform and apply an  
adjustable ramp to pin 3.  
Figure 7. Open-Loop Laboratory Text Fixture  
A fraction of the oscillator ramp can be resistively summed  
with the current sense signal to provide slope compensation  
for converters requiring duty cycles over 50%.  
Note that capacitor, C, forms a filter with R2 to suppress the  
leading edge switch spikes.  
Figure 8. Slope Complression  
9
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ  
CURRENT-MODE PWM CONTROLLER  
SGLS164 APRIL 2003  
APPLICATION INFORMATION  
Power Supply Specifications  
1. Input Voltage  
2. Line Isolation  
95VAC to 130VAC (50Hz/60Hz)  
3750V  
3. Switching Frequency 40 kHz  
4. Efficiency, Full Load  
5. Output Voltage:  
70%  
A. +5V, ±5%; 1A to 4A Load  
B. +12V, ±3%; 0.1A to 0.3A Load Ripple voltage: 100 mV P-P Max  
C. 12V, ±3%; 0.1A to 0.3A Load Ripple voltage: 100 mV P-P Max  
Figure 9. Off-Line Flyback Regulator  
10  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
PACKAGE OPTION ADDENDUM  
www.ti.com  
6-Sep-2007  
PACKAGING INFORMATION  
Orderable Device  
UC2842AQD  
Status (1)  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
Package Package  
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)  
Qty  
Type  
Drawing  
SOIC  
D
14  
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
UC2842AQD8  
UC2842AQD8R  
UC2842AQDR  
UC2843AQD  
SOIC  
SOIC  
SOIC  
SOIC  
SOIC  
SOIC  
SOIC  
SOIC  
SOIC  
SOIC  
SOIC  
SOIC  
D
D
D
D
D
D
D
D
D
D
D
D
8
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
14  
14  
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
UC2843AQD8  
UC2843AQD8R  
UC2843AQD8RQ1  
UC2843AQDR  
UC2845AQD  
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
14  
14  
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
50 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
UC2845AQD8  
UC2845AQD8R  
UC2845AQDR  
75 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
14  
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
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.  
(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  
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on  
Addendum-Page 1  
PACKAGE OPTION ADDENDUM  
www.ti.com  
6-Sep-2007  
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  
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