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TL3843

更新时间： 2024-11-23 22:42:11
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德州仪器 - TI 控制器
页数 文件大小 规格书
12页 173K
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CURRENT-MODE PWM CONTROLLERS

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TL3843 数据手册

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TL284x, TL384x  
CURRENT-MODE PWM CONTROLLERS  
SLVS038E – JANUARY 1989 – REVISED DECEMBER 1999  
D PACKAGE  
(TOP VIEW)  
Optimized for Off-Line and dc-to-dc  
Converters  
Low Start-Up Current (<1 mA)  
COMP  
NC  
REF  
13 NC  
1
2
3
4
5
6
7
14  
Automatic Feed-Forward Compensation  
Pulse-by-Pulse Current Limiting  
Enhanced Load-Response Characteristics  
Undervoltage Lockout With Hysteresis  
Double-Pulse Suppression  
12  
11  
10  
9
VFB  
V
CC  
NC  
VC  
ISENSE  
NC  
OUTPUT  
GND  
8
POWER GROUND  
RT/CT  
High-Current Totem-Pole Output  
Internally Trimmed Bandgap Reference  
500-kHz Operation  
NC – No internal connection  
D-8 OR P PACKAGE  
(TOP VIEW)  
Error Amplifier With Low Output  
Resistance  
COMP  
VFB  
ISENSE  
RT/CT  
REF  
1
2
3
4
8
7
6
5
Designed to Be Interchangeable With  
UC2842 and UC3842 Series  
V
CC  
OUTPUT  
GND  
description  
The TL284x and TL384x series of control  
integrated circuits provide the features that are  
necessary to implement off-line or dc-to-dc fixed-frequency current-mode control schemes with a minimum  
number of external components. Some of the internally implemented circuits are an undervoltage lockout  
(UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the  
error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation  
(PWM)comparator(whichalsoprovidescurrent-limitcontrol), andatotem-poleoutputstagedesignedtosource  
or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the  
off state.  
Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges.  
TypicalUVLOthresholdsof16V(on)and10V(off)ontheTLx842andTLx844devicesmakethemideallysuited  
to off-line applications. The corresponding typical thresholds for the TLx843 and TLx845 devices are 8.4 V (on)  
and 7.6 V (off). The TLx842 and TLx843 devices can operate to duty cycles approaching 100%. A duty-cycle  
range of 0 to 50% is obtained by the TLx844 and TLx845 by the addition of an internal toggle flip-flop, which  
blanks the output off every other clock cycle.  
The TL284x-series devices are characterized for operation from –40°C to 85°C. The TL384x-series devices are  
characterized for operation from 0°C to 70°C.  
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 1999, Texas Instruments Incorporated  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567...12

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