Sony ICD-SX25 Service Manual page 24

ICD-SX25/SX25VTP
– MAIN Board –
IC5003 XC9502B092AR
PWM1
IC7004 RX-4591CF
1
VDD
2
FOE
3
XIRQ
4
T1
5
FOUT
24
PWM/PFM
EXT1 1
CONTROLLER1
PWM
COMPARATOR1
2
VDD
3
FB1
ERROR AMP1
RAMP WAVE
GENERATOR1
4
VREF1=0.9V
WITH SOFT START1,
5
EN1
EN1
EN1 TO
INTERNAL CIRCUIT
IC7001 BU2090FS-E2
CONTROL
CIRCUIT
1 2 3
32.768kHz
DIVIDER
OSC
FOUT
CONTROLLER
INTERRUPTS
CONTROLLER
DI
DO BUS
INTERFACE
CLK
CIRCUIT
CE
PWM/PFM
CONTROLLER2
PWM
COMPARATOR2
ERROR AMP2
RAMP WAVE
GENERATOR2
OSC
VREF1=0.9V
GENERATOR
WITH SOFT START2,
EN2
EN2 TO
INTERNAL CIRCUIT
16 15 14 13 12 11 10 9
12 BIT
SHIFT
REGISTER
OUTPUT
12 BIT
BUFFER
STORAGE
(OPEN DRAIN)
REGISTER
4 5 6 7 8
CLOCK
AND
CALENDAR
TIMER
REGISTER
ARARM
REGISTER
CONTROL
REGISTER
AND
SYSTEM
CONTROLLER
10 EXT2
9
GND
8
FB2
7
PWM2
6
EN2
CE
10
CE
CLK
9
CLK
DO
8
DO
DI
7
DI
6
GND