Service manual

SERVICE MANUAL

SERVICE DATA

Technical Data of Key ICs

Power Control Circuit TDA4605

Control IC for Switched-Mode Power Supplies Using MOS-Transistor

1. Features

・Fold-back characteristics provide overload protection for external

components

・Burst operation under secondary short-circuit condition implemented

・Protection against open or a short of the control loop

・Switch-off if line voltage is too low (under voltage switch-off)

・Line voltage depending compensation of fold-back point

Fig.7

・Soft-start for quiet start-up without noise generated by the transformer

・Chip-over temperature protection implemented (thermal shutdown)

・On-chip ringing suppression circuit against parasitic oscillations of the transformer

・AGC-voltage reduction at low load

2. Block Diagram

Fig. 8

3. Refer to Table 12 about Functions and Service Data of the IC’s Pins.