TEA1721AT/N1,118 NXP

TEA1721AT HV start-up flyback controller with integrated MOSFET for 5 W applications, 430 Hz burst frequency Rev. 2.1 7 June 2012 Product data sheet 1. Product profile 1.1 General 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 circuit for 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 audible noise and provides an energy saver state which reduces the power consumption in no-load condition. The Burst mode frequency of 430 Hz enables no-load power consumption below < 10 mW at high mains input. 1.2 Features and benefits Power features: Low power SMPS controller with integrated power switch designed for applications up to 5 W 700 V high voltage power switch for global mains operation Primary sensing for control of the output voltage without optocoupler and secondary feedback circuitry Minimizes audible noise in all operation modes USB battery charging and Energy Star 2.0 compliant Jitter function for reduced EMITEA1721AT NXP Semiconductors HV start-up flyback controller with integrated MOSFET for 5 W Green features: Enables no-load power consumption below < 10 mW Very low supply current in no-load condition with energy saver mode Incorporates a high voltage start-up circuit with zero current consumption under normal switching operation Available in halogen-free and Restriction of Hazardous Substances (RoHS) SO7 package Protective functions: OverVoltage Protection (OVP) on Feedback control (FB) pin with auto-restart UnderVoltage LockOut (UVLO) protection on IC supply pin OverTemperature Protection (OTP) Soft-start by reduced peak current for zero and low output voltage Demagnetization protection for guaranteed discontinuous conduction mode operation Open and short-circuit protection of the Feedback control (FB) pin Short-circuit protection of the charger output 1.3 Applications Battery chargers for cellular phones and other low power adapters up to 5 W Standby supply for TV and desktop PC Power supply for white goods applications 1.4 Quick reference data Table 1. Quick reference data Symbol Parameter Conditions Min Typ Max Unit Power switch (Pin: DRAIN) R drain-source I = 30 mA T = 25 C 13 15.5 17 DSon ds j on-state resistance Oscillator (Pins: DRAIN and SOURCE) f burst frequency burst frequency in CVB mode, 390 430 470 Hz burst without jitter f oscillator maximum switching frequency 48 50.5 53 kHz osc-high frequency High in CV and CC mode, without jitter Supply (Pin: VCC) V start-up supply 15 17 19 V CC(startup) voltage V stop supply undervoltage lockout of IC 7.5 8.5 9.5 V CC(stop) voltage TEA1721AT All information provided in this document is subject to legal disclaimers. NXP B.V. 2012. All rights reserved. Product data sheet Rev. 2.1 7 June 2012 2 of 14