PUCC3801 Datasheet, PDF (1/16 Pages) NXP Semiconductors – Current-mode PWM controller

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 (V_DD)
s Internal divider regulates V_DD 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.