Sony NW-S4 Service Manual page 20

NW-S4
• IC Block Diagrams
– MAIN Board –
IC401 MAX1674EUA-TG069
ZERO CROSSING
AMP
–
MINIMUM
+
OFF-TIME
EN
ONE-SHOT
Q TRIG
ONE-SHOT
ERROR
AMP
F/F
FB 1 S Q
–
R
+
MAXIMUM
LBI 2 –
ON-TIME
+ OFF-SHOT
+
–
TRIG Q
LBO 3
ONE-SHOT
LOW-BATTERY CURRENT-LIMIT
COMPARATOR AMP
REF 4 REFERENCE
IC404 MAX1692EUB-TG069
–
12mV
+
+ –
IN 1
–
120mV
+
+ –
CHIP
BP 2
SUPPLY
RAMP
+
GEN
–
GND 3
+
SYNC
SLOPE COMPENSATION
–
REFERENCE
CELL
+
VOLTAGE FB
–
PWM
REF
REF 4
PWM ON
ON
SIGNAL
FB 5
+
–
REF
PFM
COMPARATOR
IC604 SN74LV139ADGVR
SELECT DATA OUTPUTS
16 15 14 13 12 11 10 9
A B Y0 Y1 Y2 Y3
G
G
A B Y0 Y1 Y2 Y3
1 2 3 4 5 6 7 8
SELECT DATA OUTPUTS
8 OUT
7
LX
6 GND
5 SHDN
PFM CURRENT
NEGLIM
COMPARATOR
5mA 2N PFM
COMPARATOR
ADJ.IN PWM
LIM
+ – 10 PGND
COMPARATOR
N
0.1X
SENS
9 LX
FET
PWM
COMPARATOR P
0.1X
CONTROL
SENS
AND
FET
DRIVER
LOGIC
8 SHDN
40mV
FB
+ – –
SYNC/
7
+ PWM
REF
OVERVOLTAGE
6 LIM
COMPARATOR
IC901 ML60851CLBZ060 (Not supplied part)
33 1 32 31 30 29 28 27 26 25
DREQ 34
AD7 35
AD6 36
AD5 37
END POINT FIFO/
STATUS/
AD4 8BYTE SET-UP
38
CONTROL
REGISTER
APPLICATION
GND 39
INTERFACE
VCC5 40
PROTOCOL
DPLL
ENGINE
AD3 41
AD2 42
AD1 43
USB
OSC
AD0 44
TRANSCEIVER
1 2 3 4 5 6 7 8 9 10 11
– SUB Board –
IC302 CS4343-KSR
DIGITAL
LRCK 1
VOLUME
CONTROL
SERIAL DE-
SDATA 2
BASS/TREBLE
PORT EMPHASIS
BOOST
SCLK 3
LIMITING
VD/IO 4
MCLK 5
SCL 6 CONTROL PORT
VQ HP 7
REF GND 8
20 20
24 23
D8
22
21 D9
20 D10
19 D11
18 VCC5
GND
17
16 D12
15 D13
14 D14
13 D15
12 INTR
16
15
ANALOG
∆∑
ANALOG
VOLUME 14
DAC FILTER
CONTROL
13
DIGITAL HEADPHONE
12
FILTERS AMP
11
ANALOG
∆∑
ANALOG
10
VOLUME
DAC FILTER
CONTROL
9
RST
SDA
HP B
VA HP
VA
GND
HP A
FILT+