HV9906DB2
Off-Line Current Source Controller
Introduction
The Supertex HV9906DB2 demo board contains all
circuitry necessary to demonstrate the features of the
HV9906 second order power supply controller. The
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. HV9906 is designed for
optimal controlling this type of power converter or
other types of two-stage multi-converters.
The board is optimized for driving a 6V 400mA
(700mA max.) LED. However, it may be modified to
meet custom requirements.
Specification
Input Voltage
Output Current
Output Voltage
Efficiency
80 to 135VAC, 60Hz
400mA
±10%
(700mA max.)
10V max.
62%
at Io=500mA, 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.
07/23/02
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
1
HV9906DB2
Instructions
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:
R
6
−
R
7
⋅
1
V
R
7
⋅
R
3
Iout
=
The average output current will come out 5-10%
smaller due to power transfer interruptions during the
AC line voltage cusps.
Schematic Diagram
D5
B1
D1
F1
100uH
E1
1/2A
S
4
0
F
D
D6
L3
D2
MURS160
L2
0.033
C3
MURS120
100uH
NEG
D7
M1
IRFR320
Q1
MURS120
.1
C2
R1
E2
D3
D4
22
LED1
LED
MMBT2907
R4
976K
1
DUT
8
6
R6
RTN
C5
0.1
R3
.47
2
121K
3
R5
12.1K
HV9906
4
7
R7
5
100K
C6
10uF
07/23/02
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
2
GND
HV9906DB2
Parts List
Item Reference
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
B1
C2
C3
C5
C6
D5
D6
D7
F1
L2
L3
M1
Q1
R1
R3
R4
R5
R6
R7
U1
Diode Bridge
Cap, PEN Film 0.1uF 250V
0.1 uF, 50V, 10%
10 uF, 16V Tantalum Chip
Diode, Ultra Fast, 600V 1A
Diode, Ultra Fast, 200V 1A
Diode, Ultra Fast, 200V 1A
Fuse, 1/2A, Slow Blow
100uH, 1.7A
100uH, 1.2A
MOSFET, 400V
BJT, PNP
22 ohm, 1%, 1/8W
0.47 ohm, 1%, 1/4W
976K ohm, 1%, 1/8W
12.1K ohm, 1%, 1/8W
121K ohm, 1%, 1/8W
100K ohm, 1%, 1/8W
PWM/PFM IC
HV9906
Supertex, Inc.
HV9906
MURS160T3
MURS120T3
MURS120T3
R452.500
DO3316P-104
IRFR320
MMBT2907
On Semi
On Semi
On Semi
Littelfuse
Coilcraft
On Semi
MURS160T3
MURS120T3
MURS120T3
R452.500
DO3316P-104
MMBT2907
Part
Part Number
DF04S
ECW-U2104KC9
Manufacturer
Diodes Inc.
Panasonic
Panasonic
Part No.
DF04S
ECW-U2104KC9
ECW-U2333KC9
Cap, PEN Film 0.033uF 250V ECW-U2333KC9
CTCDRH127-101 Central Technologies CTCDRH127-101
International Rectifier IRFR320
07/23/02
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
3
The Supertex SuperNova Powers the Luxeon Star
Highlights:
-
-
-
-
-
-
PCB Layout:
400mA (700mA when potted)
Small
25mm x 25mm x 11mm
size
High reliability
No electrolytic capacitors
Operates directly off AC line (85VAC<Vin<135VAC)
Maintains regulation down to 20VDC input
F
ig. 1 - Top view
Waveforms:
Fig. 2 – Bottom view
Fig. 3 – Output Current (Vin = 120VDC)
Fig. 4 – Output Current (Vin = 120AC)
Waveform Summary:
Fig. 3 shows continuous nature of the output
current. Peak-to-average current ratio is close to
unity.
Fig. 4 shows that current drops out of regulation
for short periods of time only during the AC line
cusps. (Switching ripple component is attenuated
for clarity.)
Fig. 5 shows the input current nature. The
converter delivers full output power to the output
down to very low input voltage.
Fig. 5 – Input Current and Voltage (Vin = 120VAC)
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