Daewoo DTA-14C4TFF Service Manual page 32

APPENDIX
FUNCTIONAL DESCRIPTION
8-2-3. STR-F6653 protection circuits
overcurrent protection function (OCP)
Overcurrent protection is performed pulse by pulse detecting at STR-F6653 pin 1 (OCP) the peak of the MOSFET drain current
in every pulse.
latch circuit
This circuit sustains an output low from the STR-F6653 internal oscillator and stops operation of the power supply when over-
voltage protection (OVP) and thermal shutdown (TSD) circuit are in operation
thermal shutdown circuit (TSD)
This circuit triggers the latch circuit when the frame temperature of STR-F6653 IC exceeds 140
overvoltage protection circuit (OVP)
This circuit triggers the latch circuit when the V
9. TV start-up, TV normal run and stand by mode operations
9-1. TV start-up operations
9-1-1. Schematic diagram for start-up operations
D801... D804
(GRAETZ BRIDGE)
SW801
POWER SWITCH
voltage exceeds 22V (typ.)
in
I823 REG 3.3V
IN GND OUT
1
2
12
8V
T801 SMPS TRANSFORMER
2
4
L801
3
D
I801 MOSFET AND
CONTROL IC
10
3
L511
L510
61 56
54
Vddp Vddc
VddA
I501
MICROCONTROLLER PART
SCL SDA
3
2
6 5
I702
EEPROM
°
C
RESET
IN
PULSE
CIRCUIT
OUT
L512
60 63
Reset N
Power