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UCC3818A PDF预览

UCC3818A

更新时间： 2024-11-26 04:48:11
品牌 Logo 应用领域
德州仪器 - TI 稳压器
页数 文件大小 规格书
33页 639K
描述
BiCMOS POWER FACTOR PREREGULATOR

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中文翻译

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UCC3818A 数据手册

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SLUS577B − SEPTEMBER, 2003 − REVISED FEBRUARY 2006  
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FEATURES  
DESCRIPTION  
D
Controls Boost Preregulator to Near-Unity  
Power Factor  
The UCC3817A and the UCC3818A 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.  
D
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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  
Designed in Texas Instrument’s BiCMOS process,  
the UCC3817A/UCC3818A 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  
SS 13  
16 V (FOR UCC3817A ONLY)  
7.5 V  
REFERENCE  
9
VREF  
UVLO  
16 V/10 V (UCC3817A)  
1.9 V  
ENABLE  
−
+
VAOUT  
7
10.5 V/10 V (UCC3818A)  
ZERO POWER  
0.33 V  
VCC  
−
+
VOLTAGE  
ERROR AMP  
VSENSE 11  
7.5 V  
−
+
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  
OSCILLATOR  
IAC  
6
5
PKLMT  
−
+
MOUT  
4
3
12  
14  
CAI  
CAOUT RT  
CT  
UDG-03122  
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 2006, Texas Instruments Incorporated  
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