Sony MZ-E800 Service Manual page 29

IC551 XC111256FTAEB
48
VC
VI
1
3PHASE
UI 2
CONTROL
PWM 3
VM1 4
VG VC
RO1
5
PRE
PGND1 6
DRIVER
FO1 7
VM12
8 VG
VC
RO2 9
PRE
PGND2
10
DRIVER
FO2 11
VM2 12
IC903 XC6383C601MR
CHIP
CE 1
ENABLE
VDD
VREF VLX LIMITER
VOUT 2
+
2STEP PFM CONTROL
– OSC 100/180kHz
3
NC
+
–
47 46 45 44 43
VC VG
PRE
DRIVER
VC
H-BRIDGE
CONTROL
VC
VC
ROE
BIAS
H-BRIDGE
CONTROL
VC VG
13 14 15 16 17 18 19 20 21
5 LX
BUFFER
4
VSS
42 41 40 39 38 37
+
–
+
–
+
–
VC VC VG
H-BRIDGE PRE
CONTROL DRIVER
VG
VC VC
H-BRIDGE PRE
CONTROL DRIVER
22 23 24
IC904, 907 XC6368B101MR
ERROR AMP
FB 1
VDD 2
REFERENCE VOLTAGE
CE 3 WITH SOFT START,
CHIP ENABLE
– 39 –
CPUO
36
35 CPVO
34 CPWO
33 VM3
RO3
32
31 PGND3
30 FO3
VM34
29
RO4
28
27 PGND4
26 FO4
PWM24
25
PHASE
COMPENSATION
PWM
COMPARATOR
+
+
–
–
RAMP WAVE
PWM/PFM
GENERATOR,
CONTROLLER
OSC
BUFFER,
5 EXT
DRIVER
4 GND