TL2842B

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 ...