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UCC35706DR

更新时间： 2024-11-07 23:39:03
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其他 - ETC 控制器
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13页 191K
描述
SMPS Controller

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UCC35706DR 数据手册

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SLUS473A – NOVEMBER 1999 – REVISED MARCH 2001  
D, OR P PACKAGE  
(TOP VIEW)  
D
Greater Than 4-MHz Operation  
D
Integrated Oscillator / Voltage Feed  
Forward Compensation  
ILIM  
FB  
VDD  
OUT  
GND  
RC  
1
2
3
4
8
7
6
5
D
D
D
D
D
D
D
>4:1 Input Voltage Range  
25-ns Current Limit Delay  
DGK PACKAGE  
(TOP VIEW)  
VFF  
DISCH  
Programmable Maximum Duty Cycle Clamp  
Optocoupler Interface  
1
2
3
4
8
7
6
5
ILIM  
VDD  
50-µA Start-Up Current  
FB  
OUT  
GND  
RC  
4.2-mA Operating Current @ 1 MHz  
VFF  
Smallest Footprint of the 8-pin MSOP  
Package Minimizes Board Area and Height  
DISCH  
description  
The UCC35705 and UCC35706 devices are 8-pin voltage mode primary side controllers with fast over-current  
protection. These devices are used as core high-speed building blocks in high performance isolated and  
non-isolated power converters.  
UCC35705/UCC35706 devices feature a high speed oscillator with integrated feed-forward compensation for  
improved converter performance. A typical current sense to output delay time of 25 ns provides fast response  
to overload conditions. The IC also provides an accurate programmable maximum duty cycle clamp for  
increased protection which can also be disabled for the oscillator to run at maximum possible duty cycle.  
Two UVLO options are offered. The UCC35705 with lower turn-on voltage is intended for dc-to-dc converters  
while the higher turn-on voltage and the wider UVLO range of the UCC35706 is better suited for offline  
applications.  
The UCC35705/UCC35706 family is offered in 8-pin MSOP (DGK), SOIC (D) and PDIP (P) packages.  
typical application schematic  
+
+
V
OUT  
–
V
IN  
–
VDD  
FB  
8
2
4
DISCH  
TPS2829  
5
3
RC  
OUT  
7
1
VFF  
FET DRIVER  
SOFT  
START  
CIRCUIT  
6
GND  
ILIM  
UCC35705/6  
MODE = 1  
UDG-99181  
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 2001, Texas Instruments Incorporated  
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1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567...13

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