APPLICATION IDEAS

The L6561 is a versatile device. Besides the typical application as a PFC preregulator based on boost

topology, it fits also other applications and/or topologies. Some application hints are given in the follow-

ing.

176 to 265

Vac

T1

L6561

FUSE

C2

10nF

R1

750K

R1A

750K

R2

8.2K

C3 680nF

L6569

R8

9.53K

R7A

750K

R7

750K

R6

1

D1 BYT11600

R11

22

R31

1.5M

R4 10

R12

2.2M

R29

.6K

R3

68K

R14

DZ1 4.7V

D2

1N4148

D3 1N4148

DZ2

18V

DZ3 5.6V

DZ4

20V

D5

1N4148

R16 10

R18

10K

R20

180K

R10

56K

R26

2.2M

R28

56K

R30

2.2M

R27

220

R25

82K

R22

1.5M

R24

1.5M

R21

820K

R23

820K

R19

330K

R15 10

R17

10K

R9 220K 1W

R13 47

C8

10

µF

C6

10

µF

C10

470nF

C13

470pF

C14

560pF

C17

6.8nF

630V

C18

1

µF

C16

6.8nF

630V

C12

820pF 600V

C5

22

µF

450V

NTC

Bridge

Q4

S170

LP2

LP1

L2

2.3mH

L1

2.3mH

100

16K

C11 100nF

STP6NB50

Q2

STP6NB50

Q3

C15

100nF

250V

C15A

100nF

250V

P0102AA

SCR

C1

220nF

400V

STP5NA50

Q1

C9

100nF

1

2

5

3

6

4

8

7

1

4

23

5

6

7

8

D97IN682

Figure 18. Power Factor Corrected Lamp Ballast using the L6569 driver.

2

1

L6561

4

7

3

5

6

8

85 to 265

Vac

24 Vdc / 2A

680 nF

1.5 M

Ω

1.5 M

Ω

220 k

Ω

220 k

Ω

P6KE160P

1N4937

22 µF

39 k

Ω

10

Ω

0.33

Ω

1/2 W

100 k

Ω

2.4 k

Ω

20 k

Ω

3.3 k

Ω

20 k

Ω

22 k

Ω

47 k

Ω

4.7 k

Ω

TL431

4N35

4N35

220 pF

1 µF

STP7NA60

BYW80-150

1 nF

1N4148

2A fuse

4.7 nF

2200 µF

25V

2200 µF

25V

Transformer spec:

Core: ETD29, 3C85 grade

Pri: 2 paralleled windings, 71 T/AWG27 each

Sec: 17 T, 5xAWG27 sandwiched

Aux: 10T, AWG32 evenly spaced

lgap: 1mm for 620 µH primary inductance

Figure 17. Wide Range 50W PFC, Flyback Topology.

AN966 APPLICATION NOTE

19/21