TDA4605 Datasheet | STMicroelectronics

TDA4605 CONTROL CIRCUIT FOR SWITCH MODE POWER SUPPLIES USING MOS TRANSISTORS - . . . . FOLD-BACK CHARACTERISTIC PROVIDES OVERLOAD PROTECTION FOR EXTERNAL DIODES BURST OPERATION UNDER SHORT-CIRCUIT AND NO LOAD CONDITIONS LOOP ERROR PROTECTION SWITCH-OFF IN CASE OF TOO LOW LINE VOLTAGE (under voltage switch-off) LINE VOLTAGE PENSATION OF OVERLOAD POINT SOFT-START FOR SMOOTH START-UP CHIP OVER-TEMPERATURE PROTECTION (thermal shutdown) ON-CHIP PARASITIC TRANSFORMER OSCILLATION SUPPRESSION CIRCUITRY DECREASE OF REGULATED VOLTAGE FOR LOW POWER CONSUMPTION DIP8 (Plastic Package) ORDER CODE : TDA4605 DESCRIPTION The IC TDA4605 controls the MOS Power Transistor and performs all necessary regulation and monitoring functions in free running flyback converters. 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 available 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 1/6 TDA4605 PIN CONFIGURATION Pin Number 1 Description Regulating voltage : information input concerning secondary voltage. By paring the regulating voltage obtained from the regulating winding of the transformer with the internal reference voltage, the output pulse width on Pin 5 is adapted to the load of the secondary side (normal, overload, short circuit, no load) Primary current simulation : information input regarding the primary current. The primary current rise in the primary winding is simulated at Pin...