General description

The TEA1733AT is a low cost Switched Mode Power Supply (SMPS) controller IC intended for flyback topologies. It operates in fixed frequency mode. Frequency jitter has been implemented to reduce ElectroMagnetic Interference (EMI). Slope compensation is integrated for Continuous Conduction Mode (CCM) operation. The TEA1733AT IC includes OverPower Protection (OPP). This enables the controller to

operate under overpower situations for a limited amount of time.

Features

„ SMPS controller IC enabling low-cost applications

„ Large input voltage range (12 V to 30 V)

„ Very low supply current during start-up and restart (typically 10 μA)

„ Low supply current during normal operation (typically 0.55 mA without load)

„ Overpower or high/low line compensation

„ Adjustable overpower time-out

„ Adjustable overpower restart timer

„ Fixed switching frequency with frequency jitter to reduce EMI

„ Frequency reduction with fixed minimum peak current to maintain high-efficiency at low output power levels

„ Slope compensation for CCM operation

„ Low and adjustable OverCurrent Protection (OCP) trip level

„ Adjustable soft start operation

„ Two protection inputs (e.g. for input UVP and OVP, OTP and output OVP)

„ IC overtemperature protection