PUCC3801

PUCC3801 Current-mode PWM controller Rev. 01 — 10 September 2001 Product data 1. General description The PUCC3801 is a current-mode Pulse Width Modulated (PWM) controller containing all the control and protection functions necessary to implement an off-line, flyback or forward converter with a minimum number of external components. 2. Features s Very low start-up supply current; 50 µA typical s Low operating supply current; 1.2 mA typical s Accurate, internally-trimmed, fixed frequency oscillator (100 kHz). No external timing components needed s Internal slope compensation. No external ramp components needed s Built-in over-voltage and under-voltage detection s High-speed over-current trip; 170 ns typical s Over-voltage clamp on supply voltage (VDD) s Internal divider regulates VDD to 12 V. No external divider needed s Leading edge blanking of the current sense signal s Control frequency modulated over a narrow band to reduce Electromagnetic Interference (EMI) s High output drive capability; 150 ns typical rise and fall time into 2 nF load s Wide bandwidth (10 MHz) error amplifier with external compensation pin and simple interface to optocoupler s Accurate internal bandgap reference. 3. Applications s Off-line switched mode power supplies s Laptop computer mains adaptors s Printer power supplies. Philips Semiconductors PUCC3801 Current-mode PWM controller 4. Ordering information Table 1: Ordering information Package Name PUCC3801P PUCC3801T DIP8 SO8 Description plastic du...