LG StudioWorks 570LE Service Manual page 41

L4973V3-L4973V5
L4973D3-L4973D5
Pin Configuration
OSC 1
OUT 2
OUT 3
GND 4
GND 5
GND 6
V 7
CC
V 8
CC
BOOT 9
Block Diagram
INH
10(11)
ZERO CURRENT
INHIBIT
17(19)
SS
11(12)
COMP
5.1V
+
3.3V
E/A
VFB -
12(13)
SYNC OSCILLATOR
18(20)
Pin x = Powerdip
Pin (x) = S020
3.5A STEP DOWN SWITCHING REGULATOR
18 SYNC
17 SS
16 V5.1
15 GND
14 GND
13 GND
12 VFB
11 COMP
10 INH
D94IN162A
DIP18
VREF
GOOD
5.1V
3.3V
SOFT
START
THERMAL
SHUTDOWN
-
PWM
+
4,5,6,13,14,15
(4,5,6,7,14,15,16,17)
1(1)
OSC
OSC
OUT
OUT
GND
GND
GND
GND
V
CC
V
CC
BOOT
V5.1
16(18)
INTERNAL
INTERNAL
SUPPLY
REFERENCE
HICCUP CURRENT
LIMITING
CURRENT
LIMITING
R Q
S Q
GND
- 40 -
1 20 SYNC
2 19 SS
3 18 V5.1
4 17 GND
5 16 GND
6 15 GND
7 GND
14
8 13 VFB
9 12 COMP
10 11 INH
D94IN163A
SO20
V V
CC2 CC
7(8) 8(9)
CBOOT
CHARGE
5.1V
9(10)
DRIVER
2(2) 3(3)
D94IN161B
OUT2 OUT
BOOT