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TL3844B

更新时间： 2024-11-24 03:59:31
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德州仪器 - TI 控制器
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21页 339K
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HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS

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TL284xB, TL384xB  
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS  
www.ti.com  
SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006  
FEATURES  
D (SOIC) OR P (PDIP) PACKAGE  
(TOP VIEW)  
•
•
•
•
•
Low Start-Up Current (<0.5 mA)  
Trimmed Oscillator Discharge Current  
Current Mode Operation to 500 kHz  
Automatic Feed-Forward Compensation  
COMP  
VFB  
V
V
1
2
3
4
8
7
6
5
REF  
CC  
I
OUTPUT  
GND  
SENSE  
Latching PWM for Cycle-by-Cycle Current  
Limiting  
R /C  
T
T
•
•
•
Internally Trimmed Reference With  
Undervoltage Lockout  
D (SOIC) PACKAGE  
(TOP VIEW)  
High-Current Totem-Pole Output  
Undervoltage Lockout With Hysteresis  
COMP  
NC  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
V
REF  
NC  
V
Double-Pulse Suppression  
VFB  
NC  
CC  
VC  
OUTPUT  
I
SENSE  
GND  
NC  
8
R /C  
POWER GROUND  
T
T
NC − No internal connection  
DESCRIPTION/ORDERING INFORMATION  
The TL284xB and TL384xB 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. Internally implemented circuits include an undervoltage lockout (UVLO) and a precision  
reference that is trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure  
latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a  
totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving  
N-channel MOSFETs, is low when it is in the off state.  
The TL284xB and TL384xB series are pin compatible with the standard TL284x and TL384x with the following  
improvements. The start-up current is specified to be 0.5 mA (max), while the oscillator discharge current is  
trimmed to 8.3 mA (typ). In addition, during undervoltage lockout conditions, the output has a maximum  
saturation voltage of 1.2 V while sinking 10 mA (VCC = 5 V).  
Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges.  
Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TLx842B and TLx844B devices make them ideally  
suited to off-line applications. The corresponding typical thresholds for the TLx843B and TLx845B devices are  
8.4 V (on) and 7.6 V (off). The TLx842B and TLx843B devices can operate to duty cycles approaching 100%. A  
duty-cycle range of 0% to 50% is obtained by the TLx844B and TLx845B by the addition of an internal toggle  
flip-flop, which blanks the output off every other clock cycle.The TL284xB-series devices are characterized for  
operation from –40°C to 85°C. The TL384xB-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.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 2006, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
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