Very Large Integrated Circuit Chip TEA1751LT SMPS Control Multi Chip Module

Very Large Integrated Circuit Chip TEA1751LT SMPS Control Multi Chip Module

TEA1751T; TEA1751LT

GreenChip III SMPS control IC

General description

  The GreenChip III is the third generation of green Switched Mode Power Supply (SMPS) controller ICs. The TEA1751(L)T (TEA1751T and 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 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 TEA1751(L)T is a MultiChip 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 (SIOI) is used for accurate, high speed protection functions and control.

  The TEA1751(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.

Features

 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.

Green features

„ On-chip start-up current source.

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.

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.

Block diagram