Sony MDR-NC500D Servise Manual page 22

MDR-NC500D
• IC Block Diagrams
– MAIN Board –
IC472, 473 LTC3547BEDDB#TR
BURST
CLAMP
SLOPE
COMP
–
SLEEP
VFB1 1 – ITH VSLEEP +
EA
+
BURST
0.6V
S Q
RS
LATCH
R Q
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
SOFT
START
SHUTDOWN
0.6V
RUN1 2
REFERENCE
VIN 3 SLEEP2 SLEEP1
SW1 4
SHUTDOWN
SOFT
START
OSC
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
R Q
RS
LATCH
S Q
0.6V
+ BURST
EA
–
ITH VSLEEP + SLEEP
–
SLOPE
COMP
BURST
CLAMP
MDR-NC500D
ICOMP
ANTI
SHOOT-THRU
IRCMP
+ 8 VFB2
–
7 RUN2
6 SW2
–
5 GND
+
IRCMP
ANTI
SHOOT-THRU
ICOMP
IC501, 551 TLV320AIC23BRHDRG4
28 27 26 25 24 23
CLKOUT
DIVIDER
CLKIN
(1×, 1/2×)
DIVIDER
OSC
(1×, 1/2×)
DIN 1
DIGITAL
LRCIN 2 AUDIO
INTERFACE
DOUT 3
LRCOUT 4
Σ-∆
D/A
CONVERTER
HEADPHONE 6 to - 73 dB,
Σ
HPVDD 5 DRIVER 1 dB Steps
LHPOUT 6
HEADPHONE 6 to - 73 dB,
DRIVER 1 dB Steps
RHPOUT 7
1.0 ×
8 9
– CHARGER Board –
IC401 XC6365D103MR
PWM/PFM
RAMP WAVE
CONTROLER
GENERATOR,
OSC
ERROR AMP
BUFFER,
EXT/ 1
+
DRIVER
–
PWM
VDD 2
COMPARATOR
PHASE
GND 3
COMPENSATION
22 22
22
DIGITAL CONTROL
FILTER INTERFACE
Σ-∆ Σ-∆ Σ-∆
D/A A/D A/D
CONVERTER CONVERTER CONVERTER
2 : 1 2 : 1
MUX MUX
LINE LINE 12 to - 34.5 dB,
MUTE MUTE 1.5 dB Steps
BYPASS
MUTE
12 to - 34.5 dB,
1.5 dB Steps
BYPASS
Σ
MUTE
MUTE,
0 dB, 20 dB
SIDE TONE
MUTE
1.0 × 1.0 × 1.5 ×
10 11 12 13 14
5 FB
VREF WITH
SOFT START, 4 CE
CE
21 SCLK
20 SDIN
19 MODE
18 CS
17 LLINEIN
16 RLINEIN
15 MICIN