11

9/20/2004

Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 222-8888 FAX: (408) 222-4895 www.supertex.com

HV9906

Isolated Power Factor Corrected Constant Current LED Lamp Power Supply

R9

100

T2

7

E2

B1

3

DIM

D3

BYV26

5

C1

0.1u

Q1

U1

HV9906

.

C10

1u

C2

0.1u

.

R3

30

R2

360K

T1

2

6

4

1

3

5

R11

16k

6

8

.

D8

1N4148

D6

12V

R6 100K

C4

0.1u

D7

1N4148

C3

33u

R3

12.4K

C9

0.01u

F1

1A

M1

7N60S5

.

1

C6

15u

R7

49.9K

L1

176uH

E1

.

OUT

R10

49.9K

C5

1u

C7

0.01u

462uH

R1

1.8M

R8

32.4K

D1

BYV26

12uH

R5

500

MMBT2907

D2

BYV28

D4

200V

29uH

R4

10

C8

0.01u

4

GND

D5

1N4148

D9

15V

2

AGND

This power factor corrected circuit provides a constant isolated

current output to power LED lamps. It is intended to meet the

following specifications:

Input Voltage

80VAC to 135VAC

LED String Forward Voltage

21-23V

Power Factor

>0.95

THD

<20%

Output Current

750mA

Output Power

17W