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