L6590

10/23

Figure 24. Test Board (1) with Primary Feedback: Electrical Schematic

Figure 25. Test Board (1) Evaluation Data

C2

22 µF

25 V

C4

100 nF

C7, C8

330 µF

16 V

D1

BZW06-154

D3

1N4148

D4 BYW100-100

IC1

C9

100 µF

16 V

R1 68

Ω

R4

1.5 k

Ω

D2

STTA106

L1

4.7 µH

T1

C1

22 µF

400 V

C7

2.2 nF

Y

C6

10 nF

BD1

DF06M

Vin

88 to 264 Vac

F1

2A/250V

R2

5.6 k

Ω

R3

1.1 k

Ω

T1 specification

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

≈0.5 mm gap for a primary inductance of 2.9 mH

Primary : 180 T, 2 series windings 90T each, AWG33

(∅ 0.22 mm)

Sec : 19 T, AWG30 (

∅ 0.3 mm)

Aux : 19 T, AWG33

Vo =12 V ± 10%

Po= 1 to 10 W

3

1

5

4

6, 7, 8

L6590

R5

110

Ω

C5

680 nF

Load & Line regulation

50

100

150

200

250

300

11.5

12

12.5

13

13.5

Input Voltage [Vac]

Output Voltage [V]

Efficiency

50

100

150

200

250

300

72

74

76

78

80

82

84

86

Input Voltage [Vac]

Efficiency [%]

10 W

5W

2.5 W

1W

10 W

5W

2.5 W

1W