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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.)
Board Layout and Connections
HV9906DB3
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)
~
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.
1 09/05/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
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HV9906DB3
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.
Schematic Diagram
B1
E2
E1
F1
1/2A
C2
.22uFd
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:
−++
RRRR
7816
I
OUT
=
⋅
RR
37
⋅
V
1
However, the board must be forced cooled or
encapsulated using thermally conductive encapsulant
to operate continuously at output current higher than
500mA.
C1
.033uFd
D1
MURS140
L1
100uH
D2
MURS120
C3
.082uFd
R9
10
M1
IRFR320
L2
47uH
D3
MURS120
OUT
Q1
MMBT2907
LED
ARRAY
R1
14.7K
0.2uFd
R8
14.7K
C8&C8AC5&C5A
0.2uFd
RTN
R3
0.47
10M
R5
90.9K
R4
C4&C4A
0.2uFd
D5
1N4148
0.47uFd
R2
10K
D7
30V
C9
100K
R10
1M
D6
C11
R7
4.7V
1nF
D8
1N4148
0.01uF
1
2
3
HV9906
C7
C6
15uFd
C4&C4A, C5&C5A, C8&C8A are two 0.1uF
capacitors in parallel.
U1
8
6
5
7
4
R6 100K
C10
100pF
2 09/05/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
Page 3
HV9906DB3
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
3 09/05/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
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