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TDA4605

Siemens Semiconductor
Part Number TDA4605
Manufacturer Siemens Semiconductor
Description Control IC for Switched-Mode Power Supplies using MOS-Transistors
Published Apr 23, 2005
Detailed Description Control IC for Switched-Mode Power Supplies using MOS-Transistors TDA 4605 Bipolar IC Features q Fold-back characteri...
Datasheet PDF File TDA4605 PDF File

TDA4605
TDA4605

Overview
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 components Burst operation under short-circuit conditions Loop error protection Switch-off if line voltage is too low (undervoltage switch-off) Line voltage compensation 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 voltage can be slightly above nominal value.
Nominal operation: The switching frequency declines with increasing load and decreasing AC-voltage.
The duty factor primarly depends on the AC-voltage.
The ou...


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