2

09/05/2002

Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com

Instructions

OUT, RTN

Connect your LED to these terminals. Make sure that

it is connected in the polarity shown on the diagram

above.

E1, E2

Connect 80 to 135VAC line source to these

terminals. The input is fuse protected to 0.5A.

Setting Output Current

Output current is preset to 500mA for this board.

Output current can be re-programmed by selecting

R3 according to the following equation:

V

R

R

R

R

R

R

I

OUT

1

3

7

7

8

1

6

⋅

⋅

−

+

+

=

However, the board must be forced cooled or

encapsulated using thermally conductive encapsulant

to operate continuously at output current higher than

500mA.

Schematic Diagram

R8

14.7K

0.2uFd

D1

MURS140

R3

0.47

R6 100K

D6

4.7V

E1

C1

.033uFd

L2

47uH

R5

90.9K

D8

F1

1/2A

U1

L1

100uH

D2

MURS120

E2

D7

30V

C11

1nF

C9

0.01uF

C2

.22uFd

OUT

C6

15uFd

D3

MURS120

R1

14.7K

C7

0.47uFd

D5

1N4148

Q1

0.2uFd

RTN

R7

100K

R9

10

M1

IRFR320

C3

.082uFd

R2

10K

R10

1M

C10

100pF

R4

10M

1

3

2

4

5

7

8

HV9906

6

LED

capacitors in parallel.

MMBT2907

B1

ARRAY

C8&C8A

C5&C5A

C4&C4A, C5&C5A, C8&C8A are two 0.1uF

C4&C4A

0.2uFd

HV9906DB3