Sony HBD-N590 Service Manual page 63

• IC Block Diagrams
– MB-149 Board –
IC301, 5301 RT8293ALZSP
8 7
2.7V 1.2V
INTERNAL
REGULATOR
VA VCC
SLOPE COMP
VA
CURRENT SENSE
AMPLIFIER
1 2
IC308 TPS54225PWPR
TSD
VO 1
UVLO
REFERENCE
PWM
+
+
VFB 2
VREG5 3
SS 4
SOFTSTART
GND 5
PG 6
EN
EN 7
LOGIC
6 5
VCC
0.8V
0.4V
OSCILLATOR
FOLDBACK
CONTROL
R
S
Q Q
3 4
PROTECTION
LOGIC
VREG5
UNDERVOLTAGE
LOCKOUT
HBD-N590/N790W/N890W/N990W/N995W/T79
IC601 – 603 NCP380HSNAJAAT1G
IN 1
CURRENT
LIMITER
GND 2
OSC
EN
EN 3
BLOCK
IC700, 6305 TK11133CSCL-G
IC701 TK11150CSCL-G
5
CONTROL
CIRCUIT
BANDGAP
REFERENCE
1 2
CONTROL
XCON
ROGIC
OCP
+
BLOCKING
CONTROL
GATE
DRIVER
CONTROL LOGIC
FLAG
AND TIMER
VREF UNDER
THERMAL VOLTAGE
SHUTDOWN LOCK OUT
4
OVER HEAT &
OVER CURRENT
PROTECTION
–
+
3
14 VCC
13 VIN
12 VBST
11 SW2
10 SW1
9 PGND2
8 PGND1
6 OUT
5 ILIM
4 /FLAG
63