Philips FM24 Service Manual page 111

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9.9.3 Diagram P7, TEA1507 (IC7112 and IC7212)
9.9.4 Diagram P7, L4973V (IC7260)
Circuit Descriptions and List of Abbreviations
1
SUPPLY
V CC
MANAGEMENT
internal UVLO
supply
M-level
S1
2 VOLTAGE
GND
CONTROLLED
OSCILLATOR
FREQUENCY
CONTROL
OVER-
TEMPERATURE
PROTECTION
3
−1
CTRL POWER-ON
RESET
2.5 V
burst
detect
TEA1507
Figure 9-23 Internal Block Diagram and pinning TEA1507
OSC 1
OUT 2
OUT 3
GND 4
GND 5
GND 6
V 7
CC
V 8
CC
BOOT 9
BLOCK DIAGRAM
10(11)
ZERO CURRENT
INHIBIT
17(19)
SS
11(12)
COMP
5.1V
3.3V
VFB
12(13)
SYNC
18(20)
Pin x = Powerdip
Pin (x) = S020
Figure 9-24 Internal Block Diagram and pinning L4973
Digitized in Heiloo, Holland
START-UP
CURRENT SOURCE
start
VALLEY
LOGIC
LOGIC
S Q
UVLO R Q
short
MAXIMUM
winding
ON-TIME
PROTECTION
V CC 1 8 DRAIN
GND 2 7 HVS
TEA1507
CTRL 3 6 DRIVER
DEM 4 5 I sense
MGU231
18 SYNC
17 SS
16 V5.1
15 GND
14 GND
13 GND
12 VFB
11 COMP
10 INH
D94IN162A
INH V5.1
16(18) 7(8)
VREF INTERNAL
INTERNAL
GOOD SUPPLY
5.1V
REFERENCE
3.3V
SOFT HICCUP CURRENT
LIMITING
START
CURRENT
THERMAL
SHUTDOWN LIMITING
+ R Q
E/A -
- S Q
PWM
+
OSCILLATOR
4,5,6,13,14,15
(4,5,6,7,14,15,16,17)
1(1)
OSC GND
FM24
8
clamp
7
4
100 mV
OVER-
VOLTAGE
PROTECTION
6
DRIVER
I ss
LEB
0.5 V
soft
start
blank
S2
5
OCP
0.75 V
OVERPOWER
PROTECTION
MGU230
CL 16532099_115.eps
270901
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
V V
CC CC
8(9)
CBOOT
CHARGE
5.1V
BOOT
9(10)
DRIVER
2(2) 3(3)
OUT OUT D94IN161B
CL 16532099_116.eps
270901
31/8/2014
9. EN 111
DRAIN
HVS
n.c.
DEM
DRIVER
I sense