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UC3842A/3843A LINEAR INTEGRATED CIRCUIT Uni , Ltd QW-R103-002.J CURRENT MODE PWM CONTROL CIRCUITS  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 minimal external components.  FEATURES *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  ORDERING INFORMATION 

UC3842A/3843A LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., ABSOLUTE MAXIMUM RATINGS (TA=25°C, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Supply Voltage(Low Impedance Source) VCC 30 V Supply Voltage(ICC<30mA) VCC Self Limiting V Analog Inputs (Pin 2,3) VI(ANA) -0.3 ~ +6.3 V Output Current (Peak ) IO(PEAK) ±1 A Error Amplifier Output Sink Current ISINK(EA) 10 mA Output Energy (Capacity Load) 5 μJ DIP-8 1250 Power Dissipation( TA≦25°C) SOP-8 800 mW Derated at TA>25°C PD 8 mW/°C Junction Temperature TJ +150 °C Storage Temperature TSTG -65 ~ +150 °C

(0°C≦TA≦70°C, VCC=15V, RT=10kΩ, CT=3.3nF, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT REFERENCE SECTION Output Voltage VREF TJ=25°C, IOUT=1mA 4.9 5 5.1 V Line Regulation VREF 12≦VIN25V 6 20 mV Load Regulation 

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