NXP TEA1721BT

Description

The TEA1721 is a small and low cost module Switched Mode Power Supply (SMPS) controller IC for low power applications (up to 5 W) and operates directly from the rectified universal mains input. The device includes a high voltage power switch (700 V) and has been optimized for flyback converter topologies to provide high-efficiency over the entire load range with ultra-low power consumption in the no-load condition. It provides a circuitfor start-up directly from the rectified mains voltage without any external bleeder circuits.The converter operates as a regulated voltage source from no-load up to the maximum output current and operates as current source that delivers the maximum current over a broad output voltage range. Using the TEA1721, a low power converter can be built at minimum cost and with the minimum number of external components.The controller regulates the output voltage with primary-side sensing which eliminates the need for an additional secondary feedback circuitry and simplifies the design. At higher power levels, a frequency and current control mode is used. It operates with burst mode control at low power levels and no-load condition. The burst mode minimizes audiblenoise and provides an energy saver state which reduces the power consumption in no-load condition. The Burst mode frequency of 905 Hz enables no-load power consumption below < 20 mW at high mains input.

Features

• Low power SMPS controller with integrated power switch designed for applications up
• to 5 W700 V high voltage power switch for global mains operationPrimary sensing for control of the output voltage without optocoupler and secondary
• feedback circuitryMinimizes audible noise in all operation modesUSB battery charging and Energy Star 2.0 compliantJitter function for reduced EMIEnables no-load power consumption < 20 mWVery low supply current in no-load condition with energy saver modeIncorporates a high voltage start-up circuit with zero current consumption under
• normal switching operationAvailable in halogen-free and Restriction of Hazardous Substances (RoHS) SO7
• packageOverVoltage Protection (OVP) on Feedback control (FB) pin with auto-restartUnderVoltage LockOut (UVLO) protection on IC supply pinOverTemperature Protection (OTP)Soft-start by reduced peak current for zero and low output voltageDemagnetization protection for guaranteed discontinuous conduction mode operationOpen and short-circuit protection of the Feedback control (FB) pinShort-circuit protection of the charger output

Typical applications

• Standby supply for TV and desktop PC
• Power supply for white goods applications
• Battery chargers for cellular phones and other low power adapters up to 5 W

More information

• Datasheet
• IC product information