TS3842B Datasheet | Taiwan Semiconductor

TS3842B/3843B High Performance Current Mode Controller Designed for Off-Line and DC-to-DC converter applications. DIP-8 SOP-8 General Description The TS3842B and TS3843B series are high performance fixed frequency current mode controllers. This is specifically designed for Off-Line and DC-to-DC converter applications offering the designer a cost effective solution with minimal external ponents. This integrated circuits feature a trimmed .. oscillator for precise duty cycle control, a temperature pensated reference, high gain error amplifier, current sensing parator, 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, 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 TS3842B has UVLO thresholds of 16V (on) and 10V (off), ideally suited for off-line converters. Features Trimmed Oscillator Discharge Current for Precise Duty Cycle Control Current Mode Operation to 500KHz Automatic Feed Forward pensation Latching PWM for Cycle-By-Cycle Current Limiting Internally Trimmed Reference with Undervoltage Lockout High Current Totem Pole Output Undervoltage Lockout with Hystersis Low Start-Up and Operating Current Block Diagram VCC Vref 8(14) R R RT /CT 4(7) Voltage Feedback Input 2(3) Output pensation 1(1) Vref Undervoltage Lockout 5.0V Reference 7(12) VCC Undervoltage Lockout VC 7(11) Output Oscillator Latching PWM + - Ordering Information OPERATING TEMPERATURE (Ambient) -20 to +85+ DEVICE TS3842/3843BCD TS3842/3843BCS PACKAGE DIP-8 SOP-8 6(10) Power Ground 5(8) Current Sense 3(5)Input Error Amplifier The document contains information on a...