TDA4605_03 Datasheet, PDF (1/7 Pages) STMicroelectronics – CONTROL CIRCUIT FOR SWITCH MODE POWER SUPPLIES USING MOS TRANSISTORS

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
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