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L6565DTR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
13/17
L6565
APPLICATION IDEAS
Here follows a series of ideas/suggestions aimed at either improving performance or solving common applica-
tion issues of L6565-based power supplies.
Figure 21. Enhanced turn-off for big MOSFET's drive
Figure 22. Latched shutdown on: a) feedback disconnection; b) overload or short circuit
Figure 23. Secondary Feedback loop configurations
7
6
8
GD
GND
DRIVER
Vcc
Q
L6565
Rs
BC327
a)
8
Vcc
L6565
2
COMP
b)
8
Vcc
L6565
2
COMP
BC337
BC327
1N4148
BC337
BC327
1N4148
Vout
TL431
L6565
COMP
INV
Vcc
8
12
R
A
R
B
Vout
TL431
L6565
COMPINV
1
2
ICOMP
Vout
TL431
L6565
4
CS
1
INV
Vcc
8
Rs
Roff
a) b) c)
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
[1] "L6565, QUASI-RESONANT CONTROLLER” (AN1326)
[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).
15/17
L6565
OUTLINE AND
MECHANICAL DATA
DIM.
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 3.32 0.131
a1 0.51 0.020
B 1.15 1.65 0.045 0.065
b 0.356 0.55 0.014 0.022
b1 0.204 0.304 0.008 0.012
D 10.92 0.430
E 7.95 9.75 0.313 0.384
e2.54 0.100
e3 7.62 0.300
e4 7.62 0.300
F 6.6 0.260
I 5.08 0.200
L 3.18 3.81 0.125 0.150
Z 1.52 0.060
Minidip
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

L6565DTR

Mfr. #:
Buy L6565DTR
Manufacturer:
STMicroelectronics
Description:
Switching Controllers Current-Mode Pri Cnt
Lifecycle:
New from this manufacturer.
Delivery:
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