UTCUC3843A Datasheet | Unisonic Technologies

DESCRIPTION The UTC UC3842A/3843A provide the necessary functions to implement off-line or DC to DC fixed frequency current mode , controlled switching circuits with a minimal external part count SOP-8 FEATURES - Low external part count. - Low start up current ( Typical 0.12m A ) - Automatic feed forward pensation - Pulse-by-Pulse current limiting - Under-voltage lockout with hysteresis - Double pulse Suppression - High current totem pole output to drive MOSFET directly - Internally trimmed band gap reference - 500k Hz operation DIP-8 BLOCK DIAGRAM Vcc Vref Internal Bias 1/2Vref 5V REF S/R 5 GND Vref Good Logic 1/3Vref U.V.L.O CURRENT SENSE PARATOR R PWM LATCH S Vcc VFB P 2 1 ERROR AMPLIFIER 1V OUTPUT CURRENT SENSE 3 RT/CT OSCILLATOR 5 GND ABSOLUTE MAXIMUM RATINGS(Ta=25°C) PARAMETER Supply Voltage(Low Impedance Source) Supply Voltage(Icc<30m A) Output Current ( Peak ) Output Energy(capacity Load) Analog Inputs(pin 2,3) Error Amplifier Output Sink Current Power Dissipation Lead Temperature( Soldering 10 Sec...