Sony STR-ZA5000ES Service Manual page 80

STR-ZA5000ES
– DCDC Board –
IC981 RT7237ALGSP
8 7
VCC
1.8V 1.2V
0.8V
INTERNAL
REGULATOR
VA VCC
OSCILLATOR
SLOPE COMP
FOLDBACK
CONTROL
VA
CURRENT SENSE
AMPLIFIER
1 2
IC1701, 1721, 1741, 1761 TPS54331GDR
BOOT 1
BOOT THERMAL
CHARGE SHUTDOWN
VIN 2
ENABLE
COMPARATOR
SHUTDOWN
LOGIC
EN 3
SS 4
IC1801, 1821, 1841, 1861, 1881, 1901, 1921, 1981 BD9329AEFJ-BZSE2
BST 1 VREG
OVER CURRENT
VIN 2
PROTECT
LVS S
DRIVE
SW 3
LOGIC
LVS R
GND 4
80
6 5
0.4V
S R
Q Q
3 4
BOOT
UNDERVOLTAGE
LOCKOUT
PWM
ENABLE THRESHOLD
LATCH
S
Q R
12 A/V
CURRENT
SENSE
OSCILLATOR
VIN
OSC VREF
IBIAS
UNDER VOLTAGE
LOCK OUT
THERMAL
SHUTDOWN
SLOPE
ERROR
AMP
+
–
PWM
MAXIMUM
CLAMP
DISCHARGE
LOGIC
ECO-MODE
MINIMUM CLAMP
VOLTAGE
REFERENCE
PWM
GATE
COMPARATOR
DRIVE +
+
LOGIC
–
ERROR
AMPLIFIER
SLOPE
COMPENSATION
FREQUENCY
SHIFT
8 SS
7 EN
SOFT
START
6 COMP
5 FB
8 PH
7 GND
6 COMP
5 VSENSE