TL2843B-Q1

TL2843B-Q1 www.ti.com SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012 HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLER Check for Samples: TL2843B-Q1 FEATURES 1 Qualified for Automotive Applications 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 DESCRIPTION The TL284xB 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 series are pin compatible with the standard TL284x 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 undervolta...