Philips FM23 AC Service Manual page 150

EN 150 9. FM23, FM24, FM33
9.9.5
Diagram P7, L4973V (IC7260)
9.9.6
Diagram SC2, LM1881M (7040)
Circuit Descriptions, List of Abbreviations, and IC Data Sheets
OSC 1 18 SYNC
OUT 2 17 SS
OUT 3 16 V5.1
GND 4 15 GND
GND 5 14 GND
GND 6 13 GND
V 7 12 VFB
CC
V 8 11 COMP
CC
BOOT 9 10 INH
D94IN162A
BLOCK DIAGRAM
INH
10(11)
ZERO CURRENT VREF
INHIBIT GOOD
5.1V
3.3V
17(19)
HICCUP CURRENT
SOFT
SS
START
11(12)
COMP
THERMAL
SHUTDOWN
5.1V
+
3.3V
E/A -
VFB - PWM
12(13) +
SYNC OSCILLATOR
18(20)
4,5,6,13,14,15
1(1) (4,5,6,7,14,15,16,17)
OSC
Pin x = Powerdip
Pin (x) = S020
Figure 9-25 Internal Block Diagram and pinning L4973
Figure 9-26 Internal Block Diagram and pinning LM1881
1 20 SYNC
2 19 SS
3 18 V5.1
4 17 GND
5 16 GND
6 15 GND
7 14 GND
8 13 VFB
9 12 COMP
10 11 INH
V5.1 V V
CC CC
16(18) 7(8) 8(9)
CBOOT
CHARGE
INTERNAL
5.1V
INTERNAL
SUPPLY
REFERENCE
LIMITING
CURRENT
LIMITING
BOOT
R Q 9(10)
S Q
DRIVER
2(2) 3(3)
D94IN161B
GND OUT OUT
CL 16532099_116.eps
CL 16532099_117.eps
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