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TEA1654

GreenChip™II SMPS control IC

Philips Electronics 

Philips Semiconductors

GreenChip™II SMPS control IC

Product specification

TEA1654

APPLICATION INFORMATION

A converter with the TEA1654 consists of an input filter, a transformer with a third winding (auxiliary), and an output stage

with a feedback circuit.

Capacitor CVCC (at pin VCC) buffers the supply voltage of the IC, which is powered via the high voltage rectified mains

during start-up and via the auxiliary winding during operation.

A sense resistor converts the primary current into a voltage at pin Isense. The value of this sense resistor defines the

maximum primary peak current.

handbook, full pagewidth

Vmains

PFC

Vi

Do

Vo

CVCC

VCC 8

n.c. 9

7 DRAIN

6 HVS

GND 10

5 HVS

−t

VCC(5V) 11 TEA1654T 4 DRIVER

LOCK 12

STDBY

3

CCTRL

RCTRL

CTRL

13

DEM

14

Isense Rs2

2

VCOadj

1

Np

power

MOSFET

CSS

RSS

Rsense

Ns

Co

RDEM

Naux

The LOCK pin is used in this example for an additional external overtemperature protection.

If this pin is not used, it must be tied to ground.

MDB214

Fig.11 Configuration with controlled PFC.

Rreg1

Rreg2

2003 May 12

15

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