Sony CAS-1 Service Manual page 55

– AMP Board –
IC001 TPS5420DRG4
BOOT 1
N.C. 2
SHDN
N.C. 3
1.221 V
SLOW VREF
HICCUP BANDGAP
START
REFERENCE
SHDN
RAMP
GENERATOR
SHDN
SHDN
+
+
–
–
Z1
VSENS 4
ERROR
COMPARATOR
AMPLIFIER
VSENSE
Z2
112.5% VREF
IC002 – 004 TPS54331GDR
BOOT 1
BOOT THERMAL
CHARGE SHUTDOWN
VIN 2
ENABLE
COMPARATOR
SHUTDOWN
LOGIC
EN 3
SS 4
GATE
DRIVE
SHDN
BOOT
REGULATOR
SHDN SHDN
BOOT
OVERCURRENT
OSCILLATOR
PROTECTION
SHDN
HICCUP
GAP DRIVE
CONTROL
UVLO
PWM
SHDN ENABLE
THERMAL
+ OVP
PROTECTION
–
BOOT
UNDERVOLTAGE
LOCKOUT
PWM
ENABLE THRESHOLD
LATCH
S
Q R
12 A/V
CURRENT
SENSE
OSCILLATOR
8 PH
7 VIN
6 GND
5 A
5 ENA
MAXIMUM
CLAMP
DISCHARGE
LOGIC
ECO-MODE
MINIMUM CLAMP
VOLTAGE
REFERENCE
PWM
GATE
COMPARATOR
DRIVE +
+
LOGIC
–
ERROR
AMPLIFIER
SLOPE
COMPENSATION
FREQUENCY
SHIFT
CAS-1
8 PH
7 GND
6 COMP
5 VSENSE
55