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P990+ Technical Service Manual
STR-F6654
BLOCK DIAGRAM
START
Rconst+
Function of Terminal
Terminal No.
Symbols
1
O.C.P/F.B
2
3
4
5
Other Function
Symbols
Functions
O.V.P
Built-in overvoltage protection circuit
T.S.D
Built-in thermal shutdown circuit
VIN
4
O.V.P
LATCH
REG.
O.S.C
T.S.D
Iconst
Comp.2
Rconst-
C1
Overcurrent/Feedback terminal
S
Source terminal
D
Drain terminal
VIN
Power supply terminal
GND
Ground terminal
O.S.C
Vth (1)
Comp.1
Vth(2)
R1
Description
Internal Constants
T
Adjustment Trimming Resistor
R1
OFF
I
Adjustment Trimming Resistor
R2
const
R3
150
--28--
R3
3
R4
2
1
O.C.P/F.B
5
Functions
Input of overcurrent detection signal and
constant voltage control signal
MOS FET source
MOS FET drain
Input of power supply for control circuit
Ground
D
S
GND
R4
10
C1
4700pF
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