HV9906DB2

Instructions

2

07/23/02

B1

F1

1/2A

1

D1

L3

100uH

LED1

LED

M1

IRFR320

L2

100uH

R1

22

HV9906

GND

NEG

Q1

MMBT2907

6

D5

MURS160

D

F0

4S

RTN

R3

.47

8

7

E1

C2

.1

C5

0.1

R6

121K

R4

976K

5

D4

C6

10uF

R5

12.1K

4

D3

E2

D2

2

DUT

D7

MURS120

3

R7

100K

C3

0.033

D6

MURS120

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

NEG, RTN

Connect your LED to these terminals: negative to

NEG, positive to RTN.

E1, E2

Connect 80 to 135VAC, 60Hz line source to these

terminals: line to E1, neutral to E2. The input is

protected with a 0.5A fuse. IMPORTANT: Make sure

that your LED is connected to NEG and RTN

terminals. There is no open circuit protection

available in this demo board. Contact Supertex, Inc.

for the application circuit if protection is required.

GND

This is circuit common.

Note that since galvanic isolation is not provided,

connecting this point to an earth-grounded instrument

(such as an oscilloscope) will short the AC line,

resulting in circuit and/or instrument damage.

Also note that GND may be at higher potential with

respect to earth ground, even if the AC is switched

off. Use caution!

Do not connect to earth-ground.

Setting Output Current

Output current is preset to 400mA for this board.

Output current can be re-programmed according to

the following equation:

V

R

R

R

R

Iout

1

3

7

7

6

⋅

⋅

−

=

The average output current will come out 5-10%

smaller due to power transfer interruptions during the

AC line voltage cusps.

Schematic Diagram