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NE5560
Switched-mode power supply control circuit
Philips Electronics
NE5560 Datasheet PDF : 16 Pages
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Philips Semiconductors
Switched-mode power supply control circuit
Product specification
NE/SE5560
BLOCK DIAGRAM
FEED
EXTERNAL
FORWARD R
T
C
T
SYNC INPUT
16
78
9
REFERENCE
VOLTAGE
SAWTOOTH
GENERATOR
FEEDBACK 3
VOLTAGE
4
GAIN ADJUST
MODULATOR 5
INPUT
+
–
+
CUTY CYCLE
8
CONTROL
–
0.6V
+
0.48V
0.6V
PULSE WIDTH
MODULATOR
+
–
–
+
100
Ω
1k
Ω
CURRENT
11
LIMITING
0.6V
0.48V
–
+
OC
1
+
–
0.6V
10
REMOTE
ON/OFF
NOTE:
1. See Voltage/Current fed supply characteristic curve.
Figure 2. Block Diagram
DEMAGNETIZATION
OVER-VOLTAGE PROTECTION
13
0.6V
+–
V
CC
S
LATCH
R
Q
15
OUTPUTS
14
Q
1
R
START
S
STOP
STABILIZED
SUPPLY
+
–
1
12
V
CC
2
V
Z
SL00361
1994 Aug 31
2
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