1.

General description

The GreenChip III is the third generation of green Switched Mode Power Supply (SMPS)

controller ICs. The TEA1752T and TEA1752LT combine a controller for Power Factor

Correction (PFC) and a flyback controller. The high level of integration facilitates the

design of a cost-effective power supply using a minimum 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 and 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 an adjustable minimum value. This will ensure high

efficiency at low power and good standby power performance while minimizing audible

noise from the transformer.

The TEA1752(L)T is a MultiChip Module (MCM), containing two chips. The proprietary

high voltage BCD800 process which enables direct start-up from the rectified universal

mains voltage in an effective and green way and a low voltage Silicon-On Insulator (SOI)

which provides accurate, high speed protection functions and control.

The TEA1752(L)T enables highly efficient and reliable supplies with power requirements

of up to 250 W to be designed easily and with a minimum number of external

components.

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 Semiconductors

patented, US patent number: US7575280)

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 source

TEA1752T; TEA1752LT

GreenChip III SMPS control IC

Rev. 02 — 24 June 2010

Product data sheet