TDA4605
CONTROL CIRCUIT FOR SWITCH MODE POWER SUPPLIES
USING MOS TRANSISTORS
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FOLD-BACK CHARACTERISTIC PROVIDES
OVERLOAD PROTECTION FOR EXTERNAL
DIODES
BURST OPERATION UNDER SHORT-CIR-
CUIT AND NO LOAD CONDITIONS
LOOP ERROR PROTECTION
SWITCH-OFF IN CASE OF TOO LOW LINE
VOLTAGE (under voltage switch-off)
LINE VOLTAGE COMPENSATION OF OVER-
LOAD POINT
SOFT-START FOR SMOOTH START-UP
CHIP OVER-TEMPERATURE PROTECTION
(thermal shutdown)
ON-CHIP PARASITIC TRANSFORMER OS-
CILLATION SUPPRESSION CIRCUITRY
DECREASE OF REGULATED VOLTAGE FOR
LOW POWER CONSUMPTION
DIP8
(Plastic Package)
ORDER CODE :
TDA4605
DESCRIPTION
The IC TDA4605 controls the MOS Power Transis-
tor 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 suitable
for Consumer as well as Industrial Power Supplies.
Alternative source of the TDA4605 is also avail-
able from SIEMENS Semiconductors Consumer
Electronics A.G.
PIN CONNECTIONS
SO8
(Plastic Micropackage)
ORDER CODE :
TDA4605D
REGULATION INPUT
PRIMARY CURRENT SIMULATION
PRIMARY VOLTAGE MONITORING
GROUND
1
2
3
4
8
7
6
5
ZERO CROSSING DETECTOR INPUT
SOFT-START
SUPPLY VOLTAGE
OUTPUT
4605-01.EPS
April 1996
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