Description

The UCC3916D is a current-mode Pulse Width Modulated (PWM) controller designed for off-line, flyback, or forward converters in electronic components. It is equipped with all the necessary control and protection functions, minimizing the need for external components. The UCC3916D features a very low start-up supply current, accurate fixed frequency oscillator, internal slope compensation, over-voltage and under-voltage detection, high-speed over-current trip, and more.

Specifications and 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.

Application Scenarios

- Off-line switched mode power supplies

- Laptop computer mains adaptors

- Printer power supplies.

Comparison

- Minimal need for external components

- High-speed over-current trip

- Accurate internal bandgap reference

- None mentioned in the description.