Sony HBD-E370 Service Manual page 67

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