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UCC3818DW 参数 Datasheet PDF下载

UCC3818DW图片预览
型号: UCC3818DW
PDF下载: 下载PDF文件 查看货源
内容描述: BiCMOS功率因数前置稳压器 [BiCMOS POWER FACTOR PREREGULATOR]
分类和应用: 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管信息通信管理
文件页数/大小: 32 页 / 948 K
品牌: TI [ TEXAS INSTRUMENTS ]
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UCC2817, UCC2818, UCC3817, UCC3818
BiCMOS POWER FACTOR PREREGULATOR
SLUS395J - FEBRUARY 2000 - REVISED MARCH 2009
D
Controls Boost Preregulator to Near-Unity
D
D
D
D
D
D
D
D
D
D
D
D
Power Factor
Limits Line Distortion
World Wide Line Operation
Over-Voltage Protection
Accurate Power Limiting
Average Current Mode Control
Improved Noise Immunity
Improved Feed-Forward Line Regulation
Leading Edge Modulation
150-µA Typical Start-Up Current
Low-Power BiCMOS Operation
12-V to 17-V Operation
Frequency Range 6 kHz to 220 kHz
D, DW, N, and PW PACKAGES
(TOP VIEW)
GND
PKLMT
CAOUT
CAI
MOUT
IAC
VAOUT
VFF
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
DRVOUT
VCC
CT
SS
RT
VSENSE
OVP/EN
VREF
description
The UCCx817/18 family provides all the functions necessary for active power factor corrected preregulators.
The controller achieves near unity power factor by shaping the ac input line current waveform to correspond
to that of the ac input line voltage. Average current mode control maintains stable, low distortion sinusoidal line
current.
Designed in Texas Instrument’s BiCMOS process, the UCC2817/UCC2818 offers new features such as lower
start-up current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry, a leading-edge
modulation technique to reduce ripple current in the bulk capacitor and an improved, low-offset (±2 mV) current
amplifier to reduce distortion at light load conditions.
block diagram
VCC
15
OVP/EN 10
16 V (FOR UCC2817 ONLY)
SS
VAOUT
13
1.9 V
7
VOLTAGE
ERROR AMP
X
÷
MULT
X
X2
CURRENT
AMP
+
+
OSC
MIRROR
2:1
CLK
+
0.33 V
+
8.0 V
PWM
S
Q
PWM
LATCH
R
R
1
CLK
IAC
MOUT
6
5
4
CAI
3
12
14
CT
UDG-98182
OSCILLATOR
+
2
PKLMT
GND
+
16
DRVOUT
OVP
ZERO POWER
ENABLE
UVLO
16 V/10 V (UCC2817)
10.5 V/10 V (UCC2818)
VCC
7.5 V
REFERENCE
9
VREF
VSENSE 11
7.5 V
+
VFF
8
CAOUT RT
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.
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.
Copyright
2006 − 2009, Texas Instruments Incorporated
www.ti.com
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