1 09/05/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
HV9906DB3
Off-Line PFC Current Source Controller
Introduction
The Supertex HV9906DB3 demo board is a power
factor corrected (PFC) LED driver using the HV9906
IC. A power converter of the demo board consists of
an input buck-boost stage and an output buck stage.
The output voltage polarity is negative. Due to its
unique quadratic input-to-output DC voltage transfer
ratio, the converter can operate directly off AC line to
produce low-voltage output without need for
electrolytic capacitors. The HV9906 is designed for
optimally controlling this type of a power converter or
other types of two-stage multi-converters.
HV9906DB3 demo board features passive power
factor correction to PF>0.95. The board is optimized
for driving a 500mA (700mA max.) LED array.
(Forced cooling or encapsulation is required to
achieve an output current higher than 500mA.)
Features
Off-Line Transformerless Power Conversion
Power Factor Correction to PF>0.95
Soft Start
Low Inrush Current on Start
Specification
Input Voltage 80 to 135VAC, 47-63 Hz
or 100 to 200VDC
Output Current
500mA
10% (700mA max.)
Output Voltage
10V max.
Power Factor
>0.95
Total AC Line Harmonic Distortion (THD) <15%
Efficiency
60%
(Vo=10V, Io=0.5A, Vin=100VAC)
Board Layout and Connections
~
WARNING!!!
Do not connect to scope ground or to the ground of other earth-grounded instruments. Doing so will short the AC line,
resulting in damage to the circuit and/or instruments. Either use an isolation transformer on the AC line, use a
differential probe, or use a floating, battery-powered instrument to make measurements.
WARNING!!!
No galvanic isolation. Dangerous voltages are present when connected to the AC mains.
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
1
N
4148
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
3 09/05/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
Part List
Item Reference
Part
Package
Manufacturer
Part No.
1
B1
Diode Bridge
SMD DF-S Diodes Incorporated or equivalent DF04S
2
C1
0.033 uF, 100V, 10%
SMD1913 Panasonic Pen Film
ECW-U2333KC9
3
C2
0.22uF, 250V, 10%
SMD2825 Panasonic Pen Film
ECW-U2224KCV
4
C3
0.082 uF, 100V, 10%
SMD1913 Panasonic Pen Film
ECW-U1823KC9
5
C4
0.1uF, 16V, 5%
SMD1210 Panasonic PPS Film
ECH-U1C104JB5
6
C4A
0.1uF, 16V, 5%
SMD1210 Panasonic PPS Film
ECH-U1C104JB5
7
C5
0.1uF, 16V, 5%
SMD1210 Panasonic PPS Film
ECH-U1C104JB5
8
C5A
0.1uF, 16V, 5%
SMD1210 Panasonic PPS Film
ECH-U1C104JB5
9
C6
15 uF, 16V, 10%, Tantalum SMD3528 Kemet or equivalent
10
C7
0.47uF Ceramic X7R 16V SMD0805 Panasonic or equivalent
11
C8
0.1uF, 16V, 5%
SMD1210 Panasonic PPS Film
ECH-U1C104JB5
12
C8A
0.1uF, 16V, 5%
SMD1210 Panasonic PPS Film
ECH-U1C104JB5
13
C9
0.01uF, 50V
SMD0805 Panasonic or equivalent
14
C10
100pF, NPO, 50V
SMD0603 Panasonic or equivalent
14
C11
1000pF, NPO, 50V
SMD0603 Panasonic or equivalent
15
D1
Ultra Fast, 400V, 1A
SMB
On Semi or equivalent
MURS140T3
16
D2
Ultra Fast, 200V, 1A
SMB
On Semi or equivalent
MURS120T3
17
D3
Ultra Fast, 200V, 1A
SMB
On Semi or equivalent
MURS120T3
18
D5
1N4148
SOD123 On Semi or equivalent
1N4148
19
D6
Zener, 4.7V
SMD DL-35 Diodes Inc. or equivalent
ZMM5230B
20
D7
Zener, 30V
SMD DL-41 Diodes Inc. or equivalent
ZM4751A
21
D8
1N4148
SOD123 On Semi or equivalent
1N4148
22
F1
1/2A, Slow Blow
SMD2410 Littlefuse
R452.500
23 L1 100uH,
1.7A
SMD
Sumida
CDRH127-101MC
24
L2
47uH, 1.8A
SMD
Sumida
CDRH125-470MC
25
M1
MOSFET, 400V, 3.1A
D-Pak
International Rectifier
IRFR320
26
Q1
BJT, PNP
SOT23 On Semi or equivalent
MMBT2907
27
R1
14.7K ohm, 1%
SMD0805 Panasonic or equivalent
28
R2
10.0K Ohm, 1%
SMD0805 Panasonic or equivalent
29
R3
0.47 ohm, 5%
SMD1206 Panasonic or equivalent
30
R4
10.0M Ohm, 1%
SMD0805 Panasonic or equivalent
31
R5
90.9K ohm, 1%
SMD0805 Panasonic or equivalent
32
R6
100K ohm, 1%
SMD0805 Panasonic or equivalent
33
R7
100K ohm, 1%
SMD0805 Panasonic or equivalent
34
R8
14.7K ohm, 1%
SMD0805 Panasonic or equivalent
35
R9
10.0 Ohm, 1%
SMD0805 Panasonic or equivalent
36
R10
1.0M Ohm, 1%
SMD0805 Panasonic or equivalent
37
U1
PWM/PFM IC
SOIC8
Supertex, Inc.
HV9906
HV9906DB3
PDF 
ZIP