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UCC3960DR

更新时间： 2024-11-09 23:39:07
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其他 - ETC 模拟IC开关光电二极管信息通信管理
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UCC3960DR 数据手册

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C ON TR O LL ER  
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SLUS430A – APRIL 1999 – REVISED DECEMBER 2000  
D
Operates With Secondary-Side PWM  
Control  
typical operating circuit  
X
V
IN  
D
D
D
D
Receives Isolated PWM Command Through  
a Pulse-Edge-Transformer  
UCC3960  
Initial Free-Running Soft-Start Up with  
Duty-Cycle Clamping  
2
1
FB  
SS  
VDD  
REF  
8
4
FEED  
BACK  
Up to 400-kHz Synchronizable Switching  
Frequency  
High-Current FET Drive (1.5-A Sink, 0.75-A  
Source)  
SOFT  
START  
UDG–99010  
D
D
D
Overcurrent Protection  
OUT  
CS  
7
5
6
Undervoltage Lockout with 2-V Hysteresis  
Low-Current Startup  
3
RT  
FREQ  
SET  
GND  
Figure 1  
description  
The UCC3960 primary-side startup controller is a unique solution that provides all the primary-side functions  
required for a single-ended, isolated offline, switch-mode power converter that uses secondary-side PWM  
control. It is usable with a wide range of secondary circuits and is especially well suitable for systems where  
sophisticated handling of overload conditions is required.  
Secondary-side control assumes that output voltage and current measurements are interfaced directly to an  
output ground-referenced PWM stage that develops the power switch command for the supply. This digital  
PWM command can then be transmitted to the primary-side power switch through a simple and low-cost  
isolating pulse transformer. With secondary-side control, it is much easier to monitor and control the system load  
with tightly coupled analog control loops. Load-oriented features such as output current sharing and  
synchronous rectification are implemented more easily.  
The UCC3960 provides all the circuitry required on the primary side of a secondary–side controlled power  
supply. It features a free running 60-kHz to 360-kHz oscillator that is synchronizable to the secondary-side PWM  
signal and also has the ability to accept start/stop PWM commands from the isolating pulse edge transformer.  
The use of an extremely small and low-cost pulse transformer allows for higher converter bandwidth. This also  
eliminates the loop-gain variations due to initial accuracy and aging of an opto-coupler feedback element or the  
size penalty of a gate transformer. It also includes an undervoltage lockout circuit with 2-V hysteresis, a low  
current startup with active low during UVLO, a soft-start capability, a 5-V reference and a high current power  
output.  
In a non-typical use, the UCC3960 can accommodate an analog feedback signal through an opto-isolator where  
it can operate in voltage-mode control mode with primary-side peak current limiting.  
The UCC3960 and the UCC2960 are available in the 8-pin SOIC (D) and PDIP (P) packages. A 14-pin package  
version is available as UCC2961 and UCC3961 that includes additional protection features such as multimode  
overcurrent protection, volt-second clamp, programmable overvoltage and undervoltage sense lines, and the  
self-bias regulator.  
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 2000, Texas Instruments Incorporated  
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1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567...12

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