PJ3842B

T PJ3842B / PJ3843B High Performance Current Mode Controller he PJ3842B and PJ3843B series are high performance fixed frequency current mode controllers. This is cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering. This device is available in 8-pin dual-in-line plastic packages as well as the 8-pin plastic surface mount (SOP-8). The SOP-8 package has separate power and ground pins for the totem pole output stage. The PJ3842B has UVLO thresholds of 16V (on) and 10V (off), ideally suited for off-line converters. The PJ3843B is tailored for lowervoltage applications having UVLO thresholds of 8.5V (on) and 7.6V (off). specifically designed for Off-Line and DC-to-DC converter applications offering the designer a cost effective solution with minimal external components.This 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 totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, FEATURES DIP-8 SOP-8 • • • • • • • • Trimmed Oscillator Discharge Current for Precise Duty Cycle Control Current Mode Operation to 500KHz Automatic Feed Forward Compensation Latching PWM for Cycle-By-Cycle Current Limiting Internally Lockout High Current Totem Pole Output Undervoltage Lockout with Hystersis Low Start-Up and Operating Current Trimmed Reference with Undervoltage Pin：1. Compensation Pin：2. Voltage Feedback Pin：3. Current Sense Pin：4. RT/CT 5. Gnd 6. Output 7. Vcc 8. Vref ORDERING INFORMATION Device PJ3842/3843BCD PJ3842/3843BCS SIMPLIFIED BLOCK DIAGRAM Operating Temperature (Ambient) -20℃ TO +85℃ Package DIP-8 SOP-8 The document contains information on a new product.Specifications and information herein are subject to change without notice. 1-14 2004/11.Rev B PJ3842B / PJ3843B High Performance Current Mode Controller MAXIMUM RATING Parameter Supply Voltage (low impedance source) Supply Voltage (Ii