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TDA4605

CONTROL CIRCUIT FOR SWITCH MODE POWER SUPPLIES USING MOS TRANSISTORS

STMicroelectronics 

TDA4605

CONTROL CIRCUIT FOR SWITCH MODE

POWER SUPPLIES USING MOS TRANSISTORS

s Fold-Back Characteristic provides Overload

Protection for External Diodes

s Burst Operation under Short-Circuit and no

Load Conditions

s Loop Error Protection

s Switch-off in case of too low Line Voltage

(Under Voltage Switch-off)

s Line Voltage Compensation of Overload Point

s Soft-Start for smooth Start-up

s Chip Over-Temperature Protection (Thermal

Shutdown)

s On-Chip Parasitic Transformer Oscillation

Suppression Circuitry

s Decrease of Regulated Voltage for low Power

Consumption

DESCRIPTION

The IC TDA4605 controls the MOS Power Tran-

sistor and performs all necessary regulation and

monitoring functions in free running flyback con-

verters. Since good load regulation over a wide

load range is attained, this IC is particularly suita-

ble for Consumer as well as Industrial Power Sup-

plies.

Alternative source of the TDA4605 is also availa-

ble from SIEMENS Semiconductors Consumer

Electronics A.G.

DIP28

(Plastic Package)

ORDER CODE: TDA4605

SO8

(Plastic Micropackage)

ORDER CODE: TDA4605D

Figure 1. Pin Connections

REGULATION INPUT

1

PRIMARY CURRENT SIMULATION

2

PRIMARY VOLTAGE MONITORING

3

GROUND

4

8

ZERO CROSSING DETECTOR INPUT

7

SOFT-START

6

SUPPLY VOLTAGE

5

OUTPUT

September 2003

1/7

1

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