TEA1751(L)T 데이터 시트보기 (PDF) - NXP Semiconductors.

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TEA1751(L)T

HV start-up DCM/QR flyback controller with integrated DCM/QR PFC controller

NXP Semiconductors. 

TEA1751T; TEA1751LT

GreenChip III SMPS control IC

Rev. 02 — 23 December 2009

Product data sheet

1. 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.

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.

2.2 Green features

„ On-chip start-up current source.

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