TD3845A

www.DataSheet4U.com TMC TD3842A / 3843A / 3844A / 3845A HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS DESCRIPTION The TD3842A / 3843A/384 4A/3845A are fixed frequency current-mode PWM controller. They are specially designed for Off - Line and DC-to-DC converter applications with minimum external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier. current sensing comparator, and a high current totempole output Ideally suited for driving a power MOSFET. Protection circuity Includes built in under-voltage lockout and current limiting. The TD3842A and TD3844A have UVLO thresholds of 16V (on) and 10V (off) The TD 3843A and TD3845A are 8.4V (on) and 7.6V (off) The TD3842A and TD3843A can operate within 100% duty cycle. The TD3844A and TD3845A can operate with 50% duty cycle. FEATURES Low Start Up Current Maximum Duty Clamp UVLO With Hysteresis Operating Frequency Up To 500KHz SOP-8 DIP-8 BLOCK DIAGRAM DataSheet4U.com DataShee Note 1: Toggle flip flop us ed only in 3844A a nd 3845A. PIN CONNECTIONS Compensation Voltage Feedback Current Sense RT/CT 1 8 Vref VCC Output Gnd 2 7 3 6 4 5 Top View 1 DataSheet4U.com DataSheet 4 U .com www.DataSheet4U.com TD3842A / 3843A / 3844A / 3845A MA XIMUM R AT ING S R ating B ias and Driver Voltages (Zero S eries Impedance, s ee als o Total Device s pec) Total P ower S upply and Zener C urrent Output C urrent, ...