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參數(shù)資料
| 型號(hào)： | UCC35705EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | UCC35705 Evaluation Module(UCC35705評(píng)估模塊) |
| 中文描述： | UCC35705評(píng)估模塊（UCC35705評(píng)估模塊） |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大小： | 194K |
| 代理商： | UCC35705EVM |
SLUU141
–
March 2003
6
48-V to 3.3-V RCD Forward with UCC35705 Voltage-Mode Control and Self-Driven Synchronous Rectification
4
Schematic
UCC35705EVM is built around the UCC35705 high speed voltage mode controller in a forward converter
configuration. J1 provides the 48-V
DC
nominal, 36-V
DC
to 72-V
DC
supply to the power transformer (T1) and
primary switch (Q1). The output stage uses synchronous recitifers (Q2 and Q3) to rectify the transformer
voltage, which is then smoothed by the output filter made from the output inductor (L1) and output capacitors
(C17, C18 and C19).
The UCC35705 is configured with a unity gain buffer feedback pin designed to use a secondary side
compensation network and optoisolator (U3).
The secondary side compensation network is a type three network with two zeros to cancel the voltage mode
control double pole from the output L/C tank filter and two high-frequency poles to increase the control bandwidth
and improve the supplies transient response. The feedback network uses a TL431 adjustable shunt regulator
(U4) for low cost and high noise immunity while the soft-start network (C16, R23 and D5) forces the feedback
network to come up slowly and minimizes overshoot during powerup.
A secondary dc input (J2) provides a V
CC
bias voltage for the UCC35705 PWM (U2) and the TPS2829 MOSFET
driver (U1). UCC35705EVM does not have self-biasing circuitry and will not operate without this secondary dc
input.
UCC35705EVM is designed with a 50-
feedback resistor (R24) and two test points (TP1 and TP2) to allow
for non-invasive analysis of the converters loop response with a network analyzer.
+
+
Figure 1. UCC35705EVM Board Schematic
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| UCC35705P | 功能描述:電壓模式 PWM 控制器 High Speed Vltg Mode RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| UCC35705PG4 | 功能描述:電壓模式 PWM 控制器 High Speed Vltg Mode RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| UCC35706 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH - SPEED VOLTAGE MODE PULSE MODE WIDTH MODULATOR |
| UCC35706D | 功能描述:電壓模式 PWM 控制器 High Speed Vltg Mode RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| UCC35706DG4 | 功能描述:電壓模式 PWM 控制器 High Speed Vltg Mode RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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