Circuit Descriptions; Ic Data - Philips FM24 Service Manual

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EN 110 9.
9.9

IC Data

In this paragraph, the internal block diagrams and pinning are
given of ICs that are drawn as a 'black box' in the electrical
diagrams (with exception of 'memory' and 'logic' ICs).
9.9.1 Diagram P2, TNY256 (IC7500)
BYPASS
(BP)
ENABLE/
UNDER-VOLTAGE
(EN/UV)
9.9.2 Diagram P5, MC33368 (IC7650)
Restart Delay
FB
Comp
Mult
LEB
Current Sense
ZC Det
FM24 Circuit Descriptions and List of Abbreviations
1
LINE UNDER-VOLTAGE
50 A
AUTO-
RESTART
COUNTER
CLOCK
RESET
JITTER
CLOCK
1.5 V + V TH
DC MAX
4
OSCILLATOR
1.5 V
Figure 9-21 Internal Block Diagram and pinning TNY256
2
Restart Delay
Output
Overvoltage
3
Multiplier/
4
PWM
Error
5
Amplifier
9
Current
6
Sense
WatchdogTimer/
7
Zero Current Detector
PIN CONNECTIONS
5.0 V ref
Restart Delay
Voltage FB
Comp
Mult
Current Sense
Zero Current
AGnd
Figure 9-22 Internal Block Diagram and pinning MC33368
REGULATOR
5.8 V
BYPASS PIN
UNDER-VOLTAGE
+
5.8 V
-
5.1 V
THERMAL
SHUTDOWN
S Q
R Q
BP S
1 8
S S
2 7
S
S
3 6
EN/UV D
4
5
UVLO
Internal Bias
S
S
R
Q
Frequency
Line
1 16
2 15 N/C
3 14 N/C
4 13 Frequency Clamp
5 12 V CC
6 11 Gate
7 10
PGnd
8 9
LEB
(Top View)
Digitized in Heiloo, Holland
5
DRAIN
(D)
+
- V I
LIMIT
LEADING
EDGE
BLANKING
SOURCE
(S)
99 113
CL 165320 _ .eps
270901
16
Line
12
V CC
1
V ref
Generator
8
AGnd
11
Gate
10
PGnd
13
Frequency
Clamp Clamp
CL 16532099_114.eps
270901
31/8/2014