TDA4605 Datasheet | Siemens Semiconductor Group

Control IC for Switched-Mode Power Supplies using MOS-Transistors TDA 4605 Bipolar IC Features q Fold-back characteristic provides overload protection for q q q q q q q external ponents Burst operation under short-circuit conditions Loop error protection Switch-off if line voltage is too low (undervoltage switch-off) Line voltage pensation of overload point Soft-start for quiet start-up Chip-over temperature protection (thermal shutdown) On-chip parasitic transformer oscillation suppression circuitry P-DIP-8-1 Type TDA 4605 Ordering Code Q67000-A8078 Package P-DIP-8-1 The IC TDA 4605-1 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 applicable tor consumer and industrial power supplies. The serial circuit of power transistor and primary winding of the flyback transformer is connected to the input voltage. During the switch - on period of the transistor, energy is stored in the transformer and during the switch - off period it is fed to the load via the secondary winding. By varying switchon time of the power transistor, the IC controls each portion of energy transferred to the secondary side such that the output voltage remains nearly independent ot load variations. The required control information is taken from the input voltage during the switch-on period and from a regulation winding during the switch-off period. Semiconductor Group 33 06.94 TDA 4605 In the different load ranges the switched-mode power supply (SMPS) behaves as follow: No load operation: The power supply unit oscillates at its resonant frequency typ. 100 kHz to 200 kHz. Depending upon the transformator windings the output...