TEA1751AT/N1,518

TEA1751AT TEA1751ALT GreenChip III SMPS control IC Rev. 02 1 September 2009 Product data sheet 1. General description The GreenChip III is the third generation of green Switched Mode Power Supply (SMPS) controller ICs. The TEA1751A(L)T (TEA1751AT and TEA1751ALT) 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 applies to quasi-resonant operation at high power levels, quasi-resonant operation with valley skipping, as well as to 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 will ensure high efficiency at low power and good standby power performance while minimizing audible noise from the transformer. The TEA1751A(L)T is a MultiChip Module (MCM) containing 2 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 TEA1751A(L)T enables highly efficient and reliable supplies with power requirements up to 250 W to be designed easily and with a minimum number of external components. 2. Features 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 Adjustable PFC switch-off delay 2.2 Green features On-chip start-up current sourceNXP Semiconductors TEA1751AT TEA1751ALT GreenChip III SMPS control IC 2.3 PFC green features Valley/zero voltage switching 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 by means of 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 on the TEA1751ALT and safe restart on the TEA1751AT IC overtemperature protection Low and adjustable OverCurrent Protection (OCP) trip level for both converters General purpose input for latched protection, e.g. to be used for system OverTemperature Protection (OTP) 3. Applications The device can be used in all applications that require an efficient and cost-effective power supply solution up to 250 W. Notebook adapters in particular can benefit from the high level of integration 4. Ordering information Table 1. Ordering information Type number Package Name Description Version TEA1751AT SO16 plastic small outline package 16 leads body width 3.9 mm SOT109-1 TEA1751ALT SO16 plastic small outline package 16 leads body width 3.9 mm SOT109-1 TEA1751AT TEA1751ALT 2 NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 1 September 2009 2 of 31