HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
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TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610B – AUGUST 2006 – REVISED JULY 2007
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Description
www.ti.com
TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610B – AUGUST 2006 – REVISED JULY 2007
FEATURES
Low Start-Up Current (<0.5 mA) Trimmed Oscillator Discharge Current Current Mode Operation to 500 kHz Automatic Feed-Forward Compensation Latching PWM for Cycle-by-Cycle Current
Limiting
Internally Trimmed Reference With Undervoltage Lockout
High-Current Totem-Pole Output Undervoltage Lockout With Hysteresis
Double-Pulse Suppression
D (SOIC) OR P (PDIP) PACKAGE (TOP VIEW)
COMP VFB
ISENSE RT/CT
1 2 3 4
8 VREF 7 VCC 6 OUTPUT
5 GND
D (SOIC) PACKAGE (TOP VIEW)
COMP NC
VFB NC
ISENSE NC
RT/CT
1 2 3 4 5 6 7
14 VREF 13 NC 12 VCC 11 VC 10 OUTPUT 9 GND 8 POWER GROUND
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 ...
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