TEA1541 데이터 시트보기 (PDF) - Philips Electronics

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TEA1541

SMPS control IC with synchronization function

Philips Electronics 

Philips Semiconductors

SMPS control IC with

synchronization function

Product specification

TEA1541

11 APPLICATION INFORMATION

A typical flyback converter that uses the TEA1541 consists

of an input filter, a transformer with a third (auxiliary)

winding, and an output stage with a feedback circuit.

Capacitor CVCC connected to pin VCC buffers the IC supply

voltage from the rectified high voltage (AC) mains during

start-up, or from the auxiliary winding during operation.

Resistor Rsense converts the primary current into a voltage

at pin Isense. The resistor value defines the maximum

primary peak current. Resistor RSS and capacitor CSS

enable soft start and burst standby mode operation.

A resistor and a series diode can be placed in parallel with

resistor RDEM to control the amount of current flowing into,

and out of the IC, allowing the values of the OVP level and

primary current simulation to be defined independently.

More details are available in Application note AN10205.

handbook, full pagewidth

Vmains

CVIN RSNUB

Sync

CVCC

CSYNC

RSYNC

CREG

RREG

VCC

1

GND

2

CTRL

3

DEM

4

TEA1541P

VIN

8

DSNUB

7 HV

DRIVER

6

Isense

5

RSS

CSS

RDEM

DVCC

DOUT

CSNUB

COUT

OUTPUT

power

MOSFET

Rsense

MDB081

OPTO

RREG1

RREG2

Fig.8 Flyback configuration with synchronization and soft start.

2003 Aug 11

15

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