TEA1751LTN1,518 NXP

TEA1751LT HV start-up DCM/QR flyback controller with integrated DCM/QR PFC controller Rev. 3 9 January 2013 Product data sheet 1. General description The TEA1751LT is the third generation of green Switched Mode Power Supply (SMPS) controller ICs. The TEA1751LT combines a controller for Power Factor Correction (PFC) and a flyback controller. Its high level of integration allows the design of a cost-effective power supply with a very low number of external components. The special built-in green functions provide high efficiency at all power levels. This efficiency applies to quasi-resonant operation at high-power levels, quasi-resonant operation with valley skipping, as well as reduced frequency operation at lower power levels. At low-power levels, the PFC switches off to maintain high efficiency. During low-power conditions, the flyback controller switches to frequency reduction mode and limits the peak current to 25 % of its maximum value. This mode ensures high efficiency at low-power and good standby power performance while minimizing audible noise from the transformer. The TEA1751LT is a Multi-Chip Module, (MCM), containing two chips. The proprietary high-voltage BCD800 process which makes direct start-up possible from the rectified universal mains voltage in an effective and green way. The second low voltage Silicon On Insulator (SOI) is used for accurate, high speed protection functions and control. The TEA1751LT enables the design of highly efficient and reliable supplies with power requirements of up to 250 W using the minimum number of external components. Remark: All values provided throughout this data sheet are typical values unless otherwise stated.TEA1751LT NXP Semiconductors HV start-up flyback controller with integrated PFC controller 2. Features and benefits 2.1 Distinctive features Integrated PFC and flyback controller Universal mains supply operation (70 V (AC) to 276 V (AC)) Dual-boost PFC with accurate maximum output voltage (NXP patented) High level of integration, resulting in a very low external component count and a cost-effective design 2.2 Green features On-chip start-up current source 2.3 PFC green features Valley/Zero Voltage Switching (ZVS) for minimum switching losses (NXP patented) Frequency limitation to reduce switching losses PFC is switched off when a low load is detected at the flyback output 2.4 Flyback green features Valley switching for minimum switching losses (NXP patented) Frequency reduction with fixed minimum peak current at low-power operation to maintain high efficiency at low output power levels 2.5 Protection features Safe restart mode for system fault conditions Continuous mode protection with demagnetization detection for both converters (NXP patented) UnderVoltage Protection (UVP) (foldback during overload) Accurate OverVoltage Protection (OVP) for both converters (adjustable for flyback converter) Mains voltage independent OverPower Protection (OPP) Open control loop protection for both converters. The open-loop protection on the flyback converter is latched OverTemperature Protection (OTP) Low and adjustable OverCurrent Protection (OCP) trip level for both converters General-purpose input for latched protection to provide system OverTemperature Protection (OTP) for example 3. Applications The device is used in all applications requiring an efficient and cost-effective power supply solutions up to 250 W. Notebook adapters in particular can benefit from the high level of integration TEA1751LT All information provided in this document is subject to legal disclaimers. NXP B.V. 2013. All rights reserved. Product data sheet Rev. 3. 9 January 2013 2 of 31