18
E. POWER BLOCK
This chassis designed for free voltage(AC 100V ~ AC 220V ) power. power block contains power IC, SMPS
transformer and several passive components.
The power IC STR-S5707 has power transistor. oscillator circuit, voltage comparator circuit, thermal protection
circuit, OCP(over current protection) circuit insiude.
1.STR-S5707 BLOCK DIAGRAM
2.PIN DESCRIPTION
INH-1
REF
OCP
REF
INH-2
REF
INH-3
REF
9
7
6
8
4
3
1
2
5
START UP
PRE REG
OSC
T.S.D
OVP
LATCH
V IN
INH
PROPOTIONAL
DRIVE
Tr2
R6
PNP +2Di
R7
R8
R9
Tr1
R4
R4
R3
R1
C1
C4
R5
C2
C3
R2
DIRVE
SINK
B
C
GND
OCP
SENS
PIN NO SYMBOL
NAME
FUNCTION
1
C
COLLECTOR
POWER TRANSISTOR COLLECTOR
2
GND
GROUND
GROUND(POWER TRANSISTOR EMITTER)
3
B
BASE
POWER TRANSISTOR BASE
4
SINK
SINK
BASE CURRENT (Is) INPUT
5
OCP
OVER CURRENT PROTECTION
OVERCURRENT SENSING SIGNAL INPUT
6
INH
INHIBIT / LATCH
SYNC, OFF TIME/LATCH CIRCUIT CONTROL INPUT
7
F/B(SENS) FEED BACK(SENSING) INPUT
CONSTANT VOLTAGE CONTROL SIGNAL INPUT
8
DRIVE
DRIVE
BASE DRIVE CURRENT (Id) OUTPUT
9
Vin
Vin
SUPPLY VOLTAGR FOR CONTROL CIRCUIT
3. OTHER FUNCTION
Symbol
Function
OVP
Built-in Overvoltage Protection Circuit
TSD
Built-in Thermal Shutdown Circuit
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