DESCRIPTION
*Low start up current ( Typical 0.12mA ) *Automatic feed forward compensation *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 *500kHz operation DIP-8 BLOCK DIAGRAM 7 Vcc Vref 8 Internal Bias 1/2Vref 5V REF S/R 5 GND Vref Good Logic 1/3Vref U.V.L.O CURRENT SENSE COMPARATOR R PWM LATCH S 7 Vcc VFB COMP 2 1 ERROR AMPLIFIER 1V 6 OUTPUT CURRENT SENSE 3 RT/CT 4 OSCILLATOR 5 GND ABSOLUTE MAXIMUM RATINGS
(Ta=25°C) PARAMETER Supply Voltage(Low Impedance Source) Supply Voltage(Icc<30mA) Output Current ( Peak ) Output Energy(capacity Load) Analog Inputs(pin 2,3) Error Amplifier Output Sink Current Power Dissipation Lead Temperature( Soldering 10 Sec ) SYMBOL VCC Vcc Io VI(ANA) ISINK(EA) PD DIP-8 SOP-8 Tlead VALUE 30 Self Limiting +-1 5 -0.3 ~ +6.3 10 at Tamb<=25°C 1.0 at Tamb<=25°C 0.5 300 UNIT V V A µJ V mA W W °C UTC UNISONIC TECHNOLOGIES CO., LTD.
Unisonic Technologies
