Description

The UCC3802DTRG4 is an AC DC converter and offline switcher electronic component model. It is a current-mode Pulse Width Modulated (PWM) controller that contains all the control and protection functions needed to implement an off-line, flyback or forward converter with a minimum number of external components.

Specifications and features

The UCC3802DTRG4 has the following 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

The UCC3802DTRG4 is ideal for use in the following applications:

• Off-line switched mode power supplies
• Laptop computer mains adaptors
• Printer power supplies

Comparison

• Contains all necessary control and protection functions for off-line, flyback or forward converter with a minimum number of external components
• Low start-up and operating supply currents
• Accurate, internally-trimmed, fixed frequency oscillator with no need for external timing components
• Internal slope compensation and divider regulation
• Built-in over-voltage and under-voltage detection
• High-speed over-current trip with over-voltage clamp and leading edge blanking
• Control frequency modulated over a narrow band to reduce EMI
• High output drive capability and wide bandwidth error amplifier
• Accurate internal bandgap reference

• None identified