UCC3912PWPG4 Контроллеры горячей замены PMIC от Texas Instruments

Обзор продукта

Обзор

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. Features • Very low start-up supply current; 50 µA typical • Low operating supply current; 1.2 mA typical • Accurate, internally-trimmed, fixed frequency oscillator (100 kHz). No external timing components needed • Internal slope compensation. No external ramp components needed • Built-in over-voltage and under-voltage detection • High-speed over-current trip; 170 ns typical • Over-voltage clamp on supply voltage (VDD) • Internal divider regulates VDD to 12 V. No external divider needed • Leading edge blanking of the current sense signal • Control frequency modulated over a narrow band to reduce Electromagnetic Interference (EMI) • High output drive capability; 150 ns typical rise and fall time into 2 nF load • Wide bandwidth (10 MHz) error amplifier with external compensation pin and simple interface to optocoupler • Accurate internal bandgap reference.Applications • Off-line switched mode power supplies • Laptop computer mains adaptors • Printer power supplies.