Datasheet

L6565
14/17
Figure 24. Primary Feedback loop configurations
a)
Vcc
-
+
GND
L6565
E/A
INV
2.5V
COMP
to VFF
block
R
H
R
L
8
2
1
6
Vcc
-
+
GND
L6565
E/A
INV
2.5V
COMP
to VFF
block
R
H
R
L
8
2
1
6
b)
Figure 25. Protection against secondary
feedback disconnection by primary
regulation take-over
Figure 26. Leading edge blanking circuit for
enhanced primary regulation
Figure 27. Remote ON/OFF control
Figure 28. Low-consumption start-up circuit
8
Vcc
L6565
INV
1
15 V
2.2 kΩ
COMP
2
Vcc
GND
L6565
1N4148BC327
2.7 k
Ω
470 pF
L6565
ZCD
ON
OFF
BC337
5
8
6
L6565
C
SUPPLY
Vac
R
1N4148
+Vin
Vcc
GND
CSTART
1N4148
RELATED DOCUMENTATION
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[2] “25W QUASI-RESONANT FLYBACK CONVERTER FOR SET-TOP BOX APPLICATIONS USING THE
L6565” (AN1376)
[3] “EVAL6565N, 30W AC-DC ADAPTER WITH THE L6565 QUASI-RESONANT PWM CONTROLLER”
(AN1439).