Sony HBD-E770W Service Manual page 68

HBD-E770W
Q Q
3 7 6 3 1 5 1 5 0
• IC Block Diagrams
– MB-134 Board –
IC303 MM3141CNRE
VDD 1 REGULATOR 5 VOUT
GND 2 4 NC
CURRENT
CE 3 BIAS
LIMIT
IC308 MP2301ENE-LF-Z
5V
BS 1
CURRENT
IN 2
SENSE OSCILLATOR
AMPLIFIER
INTERNAL
REGULATORS
COMPARATOR
Q S
CURRENT
Q R
COMPARATOR
SW 3
1.2V
COMPARATOR
T E
L 1 3 9 4 2 2 9 6 5 1 3
GND 4
IC309, 310 TPS54325PWPR
REF REF
VREG5 VREG5
-30% UV
UVLO
PROTECTION
OV
VO 1 LOGIC
+20%
TSD
REF
PWM
+
+ CONTROL
VFB 2
LOGIC
VREG5 3
SS 4 SOFT START
GND 5
w w w
PG 6
REF
-10%
EN
EN 7
LOGIC
HBD-E770W
IC307 MM3293DNRE
REGULATOR
VDD 1 5 VOUT
GND 2
CE 3 4 NC
0.3V
–
340kHz
+
1.5V
SHUTDOWN
6 A
2.5V
8 SS
LOCKOUT
7 EN
0.95V
–
+
6 COMP
0.8V
ERROR
AMPLIFIER
5 FB
14 VCC
VREG5
13 VIN
12 VBST
11 SW2
10 SW1
XCON
VREG5
x a o
. i
9 PGND2
OCP
8 PGND1
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IC311 BD3539NUX-TR
8
VCC
REFERENCE
BLOCK
UVLO
+
VCC
+
TSD
EN
UVLO
VCC
TSD
EN
UVLO
1 2
IC601, 602 SI-3010KM-TLS
VC 1
VIN 2
GND 3
Q Q
3 7 6
TSD
–
+
REF
VOUT 4
ADJ 5
IC1001 NJM2878F3-33 (TE2)
5
THERMAL
PROTECTION
BANDGAP
REFERENCE
u 1 6 3
y
1 2
68 68
2 4
8 9 9
IC312 MM1855AHBE
7 6 5
8 7 6 5
VCC
BIAS
UVLO
DRIVER
SOFT
TSD
CURRENT
EN
LIMITTER
UVLO
THERMAL
TSD
PROTECTION
1 2
EN
3 4
IC704 TK11133CSCL-G
IC705 TK11150CSCL-G
5
3 1 5 1 5 0 8 9
OVER CURRENT
CONTROL
CIRCUIT
BANDGAP
REFERENCE
1 2
IC1002 NJM2828F3-05
4
5
THERMAL
PROTECTION
m
BANDGAP
REFERENCE
c o
3
.
1
2
8 9 9
REFERENCE
THERMAL
SHUTDOWN
3 4
4
2 OVER HEAT & 4 9 8 2 9 9
PROTECTION
–
+
3
4
CURRENT OUTPUT
LIMIT CONTROL
2 3