鈥?/div>
Short Circuit Protection with
Programmable Delay
DESCRIPTION
The UC3584 is a low voltage, Secondary Side Synchronous Post Regula-
tor. It is intended to be used for auxiliary output voltage regulation in single
secondary winding, multiple output power supplies (for more details refer
to the Application Section of this Data sheet). The UC3584 is most suited
for systems where the main output is regulated between 5V and 14V. Out-
put voltages regulated by the UC3584 can range from virtually 0V up to
the output voltage of the main output.
Auxiliary output voltage regulation with the UC3584 uses leading edge
modulation making it compatible to primary side peak current or voltage
mode control. The UC3584 clock circuit is synchronized to the switching
frequency utilizing the falling edge of the transformer鈥檚 secondary winding
waveform.
TYPICAL APPLICATION DIAGRAM.
7碌H
5V
MAIN
10
2
IRFR024
33碌H
COILTRONICS
390碌F
10
2
CSHD
10-45L
170kHz
PUSH-PULL
4.75k鈩?/div>
+
+
+
+
1500pF
30.1k鈩?/div>
1.33k鈩?/div>
1k鈩?/div>
1
3300pF
24.3k鈩?/div>
120pF
20k鈩?/div>
2
0.1碌F
3
1000pF
4
5
CDLY
GND
10BQ040
6
1.5碌F
7
8
OUT
VFLT
SRC
BST2
PGND
11
10
VCC
12
SS
COMP
VREG
13
0.1碌F
CT
15
15k鈩?/div>
RT
14
1N4148
FB
SYNC
16
220pF
100pF
3.3V
AUX
0.1碌F
100鈩?/div>
1.5W
+ OS-CON
330碌F
+
1碌F
3.57k鈩?/div>
3.3鈩?/div>
10碌F
+
SOLID
TANTALUM
0.1碌F
33碌H
COLTRONICS
+
470碌F
BST1
9
1N4148
UDG-99062
03/99
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