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UCC2819A PDF预览

UCC2819A

更新时间： 2024-11-20 04:48:15
品牌 Logo 应用领域
德州仪器 - TI 调节器输出元件
页数 文件大小 规格书
21页 508K
描述
PROGRAMMABLE OUTPUT POWER FACTOR PREREGULATOR

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中文翻译

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UCC2819A 数据手册

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SLUS579 − OCTOBER, 2003  
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FEATURES  
DESCRIPTION  
D
Controls Boost Preregulator to Near-Unity  
Power Factor  
The UCC2819A/UCC3819A 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.  
D
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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  
Designed in Texas Instrument’s BiCMOS process,  
the UCC3819A offers new features such as lower  
start-up current, lower power dissipation,  
overvoltage protection, a shunt UVLO detect  
circuitry and a leading-edge modulation technique  
to reduce ripple current in the bulk capacitor.  
150-µA Typical Start-Up Current  
Low-Power BiCMOS Operation  
10.8-V to 17-V Operation  
Programmable Output Voltage (Tracking  
Boost Topology)  
The UCC3819A allows the output voltage to be  
programmed by bringing out the error amplifier  
noninverting input.  
BLOCK DIAGRAM  
VCC  
15  
OVP/EN 10  
7.5 V  
REFERENCE  
9
VREF  
1.9 V  
ENABLE  
−
+
UVLO  
10.2 V/9.7 V  
VAOUT  
7
ZERO POWER  
0.33 V  
VCC  
−
+
VOLTAGE  
ERROR AMP  
VSENSE 11  
VAI 13  
−
+
CURRENT  
AMP  
8.0 V  
PWM  
OVP  
Q
+
−
X
÷
MULT  
−
+
16 DRVOUT  
−
+
X
S
2
VFF  
8
X
PWM  
LATCH  
OSC  
CLK  
R
R
MIRROR  
2:1  
1
2
GND  
CLK  
IAC  
6
5
PKLMT  
−
+
OSCILLATOR  
MOUT  
4
3
12  
14  
UDG-03124  
CAI  
CAOUT RT  
CT  
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.  
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Copyright 2003, Texas Instruments Incorporated  
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