Sony HBD-E370 - Page 67

HBD-E370/E470/E570/E870/T57
67
• IC Block Diagrams
- MB-134 Board -
IC303 MM3141CNRE
5
4
1
REGULATOR
CURRENT
LIMIT
VDD
3
BIAS
CE
2
GND
VOUT
NC
IC307 MM3293DNRE
VDD 1
GND
2
CE
3
NC4
REGULATOR
VOUT
5
IC308 MP2301ENE-LF-Z
IC309, 310 TPS54325PWPR
SS8
EN7
COMP
6
FB5
CURRENT
SENSE
AMPLIFIER
BS 1
IN
2
SW
3
GND
4
6
Q
Q
S
R
CURRENT
COMPARATOR
OSCILLATOR
340kHz
LOCKOUT
COMPARATOR
ERROR
AMPLIFIER
SHUTDOWN
COMPARATOR
INTERNAL
REGULATORS
+
–
+
–
2.5V
6PA
1.5V
0.3V
0.95V
0.8V
1.2V
5V
VO 1
VCC14
VFB 2
VREG5 3
SS 4
GND 5
PG 6
EN 7
PGND18
PGND29
SW110
SW211
VBST12
VIN13
VREG5
OCP
UV
OV
PWM
VREG5
-30%
+20%
XCON
CONTROL
LOGIC
EN
LOGIC
REF
REF
-10%
+

+
+

SOFT START
TSD
PROTECTION
LOGIC
UVLO
REF
REF
VREG5
VREG5