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L6590

Figure 26. Test Board (1) Main Waveforms

Figure 27. Test Board (2) with Secondary Feedback: Electrical Schematic

Ch2: Vdrain

Pout = 10 W

Pout = 10 W

Pout = 1 W

Pout = 1 W

Ch3: Idrain

Ch2: Vdrain

Ch3: Idrain

Ch2: Vdrain

Ch3: Idrain

Ch2: Vdrain

Ch3: Idrain

T1 specification

Core E20/10/6, ferrite 3C85 or N67 or equivalent

≈0.6 mm gap for a primary inductance of 1.4 mH

Primary : 128 T, 2 series windings 64T each, AWG32

(∅ 0.22 mm)

Sec : 6 T, 4xAWG32

Aux : 14 T, AWG32

5Vdc / 2 A

C2

22 µF

25V

C4

2.2 nF

Y1

class

C8

220 µF

10V

Rubycon

ZL

C9

100 nF

R2

560

Ω

D1

BZW06-154

D3

1N4148

D4 1N5822

OP1

PC817

3

1

2

3

C5, C6, C7

470 µF

16V

Rubycon ZL

R1 10

Ω

C3

22 nF

L1

4.7 µH

T1

D2

STTA106

BD1

DF06M

Vin

88 to 264

Vac

F1

2A/250V

L

22 mH

100 nF

100 nF

C1

22 µF

400 V

4

2

1

IC2

TL431

R3

2.43 k

Ω

R4

2.43 k

Ω

R5

2k

Ω

3

1

5

4

6, 7, 8

L6590

IC1

R6

6.8 k

Ω