Sony HBD-E570 Service Manual page 67

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• IC Block Diagrams
- MB-134 Board -
IC303 MM3141CNRE
VDD 1
REGULATOR
GND 2
CURRENT
CE
3 BIAS
IC308 MP2301ENE-LF-Z
5V
BS 1
IN 2
REGULATORS
SW 3
TE
GND 4 L 13942296513
IC309, 310 TPS54325PWPR
VREG5
VO 1
VFB 2
VREG5 3
SS 4 SOFT START
GND 5
www
PG 6
.
EN
EN 7
LOGIC
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5 VOUT
4 NC
LIMIT
CURRENT
SENSE
AMPLIFIER
INTERNAL
Q S
CURRENT
Q R
COMPARATOR
1.2V
REF
UV
-30%
UVLO
OV
+20%
TSD
REF
PWM
+
+ CONTROL
LOGIC
x ao
REF
y
i -10%
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8
IC307 MM3293DNRE
REGULATOR
VDD 1
GND 2
CE 3
OSCILLATOR
340kHz
1.5V
SHUTDOWN
COMPARATOR
2.5V
LOCKOUT
COMPARATOR
Q Q
3 6 7 1 3
–
+
0.8V
ERROR
AMPLIFIER
REF
VREG5
PROTECTION
VREG5
LOGIC
XCON
VREG5
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.
OCP
HBD-E370/E470/E570/E870/T57
2 9 9 4 2 8
5 VOUT
4 NC
0.3V
–
+
6 A
8 SS
7 EN
1 5 0 5 8 2 9 9 4
0.95V
6 COMP
5 FB
14 VCC
13 VIN
12 VBST
11 SW2
10 SW1
m
co
9 PGND2
8 PGND1
9 9
2 8 9 9
67