Sony Walkman NW-HD1 Service Manual page 31

IC9001 LTC3441EDE#TR
SHDN/SS 1
SUPPLY
4A
CURRENT
LIMIT
2.4V
VCC
INTERNAL
UVLO
GND 2
AVERAGE
CURRENT
PGND 3
LIMIT
3.2A
SWA
SW1 4
SWB
SW2 5
PGND 6
IC9003 TPS62200DBVR
VI 1
UNDERVOLTAGE
LOCKOUT
BIAS SUPPLY
V
I
SOFT START
1 MHz
OSCILLATOR
V (COMP)
COMPARATOR
SAWTOOTH
GENERATOR
GND 2
GM
EN 3
SHUTDOWN
PWM
PWM
COMPARATORS
LOGIC
AND
OUTPUT
PHASING
THERMAL
SHUTDOWN
REVERSE CURRENT
LIMIT
–0.8A
SWD
GATE DRIVERS
AND
ANTICTOSS
CONDUCTION
SWC
1MHz
OSC
SYNC BURST MODE
SLEEP OPERATION
CONTROL
1/2 5µs DELAY
CURRENT LIMIT
COMPARATOR
SKIP COMPARATOR
DRIVER
CONTROL
SHOOT-THROUGH
LIGIC
LOGIC
LOAD COMPARATOR
COMPENSATION
VREF=0.5V
1.22V
12 FB
EEEOR
AMP
11 VC
10 VIN
9 PVIN
8 VOUT
7 MODE/SYNC
REF
REF
5 SW
4 FB
NW-HD1
31