HV9921DB1 Supertex, HV9921DB1 Datasheet - Page 2

• Manufacturer Part Number: HV9921DB1
• Manufacturer: Supertex

Specifications of HV9921DB1

• Lead Free Status / RoHS Status: Not Compliant

Testing the HV9921DB1
Connect the LED string to the output terminals.
Check the polarity of the LED connection, anode end of the
string should be connected to the positive output, cathode
should be connected to the negative output. Connect the
AC input to the input terminals. Apply the AC voltage at
the input terminals and the LED string should start to glow.
The HV9921DB1 will regulate constant 20mA current in the
LED.
Schematic Diagram
Bill of Materials
051109
©2009
Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an
adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liability to the
replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and specifications
are subject to change without notice. For the latest product specifications refer to the Supertex inc. website: http//www.supertex.com.
Reference
VRD1
D2-5
C
C
C
D1
U1
C
L
F1
L1
IN2
DD
IN
IN
O
Description
0.1µF, 400V, metalized polyester film
0.033µF, 400V, metalized polyester film
0.01µF, 100V, X7R, MLCC
0.1µF, 50V, X7R, MLCC
68mH, 36mA, mini-drum
2.2mH, 64mA, axial
Diode, UF 600V 1.0A 75ns
Diode, 600V 1.0A
Surge absorber
LED Driver IC
Integrated PCB fuse
85-265V
AC Line
All rights reserved. Unauthorized use or reproduction is prohibited.
D2
D4
F1
VRD1
D3
D5
C
DD
C
3
IN2
VDD
L
HV9921
IN
GND
U1
2
2
An ammeter can be connected in series with the LED(s) to
measure the output current. The average current reading
may be smaller than 20mA. This is due to the interruptions
in the LED current when the input AC line voltage falls below
the forward voltage of the LED string. The average current
will also vary over the AC line voltage range. Additional
hold-up capacitance can be included across C
interruptions are not desirable.
DRAIN
B37981M1103K054
B37987F5104K054
RL-5480-3-68000
ECQ-E4104KF
ECQ-E4333KF
ERZ-V05D431
Part Number
HV9921N3-G
CTH6-222K
C
1
MUR160
IN
1N4005
N/A
D1
1235 Bordeaux Drive, Sunnyvale, CA 94089
C
O
Central Technologies
On Semiconductor
Renco Electronics
Manufacturer
L1
Supertex, Inc
LED
Diodes, Inc
Panasonic
Panasonic
Panasonic
HV9921DB1
Epcos
Epcos
www.supertex.com
1
N/A
- LED
Tel: [phone]
IN
12
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