HV9910DB1
Off-Line, High Brightness,
LED Driver Demo Board
General Description
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Connection
HV9910DB1 can supply a maximum output current of 1.5A
to drive LED strings that are 40V or less from a 120V, 60Hz
input. It has an efficiency of about 90% at full load and
operates typically at 85% input power factor.
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The Supertex HV9910DB1 demo board is a complete high
current, high brightness (HB) LED power driver to supply
a string of LEDs using the HV9910B IC. The demo board
can be used to test the performance of the HV9910B as a
constant current driver to power a string or multiple strings
of LEDs.
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Specifications
Input Voltage:
Load current:
LED string voltage:
Switching Frequency:
Efficiency:
Dimensions:
The power conversion stage of HV9910DB1 consists of a
passive power factor corrector circuit followed by a current-
controlled buck converter operating at a switching frequency
of 80kHz. The nominal output current of the demo board can
be adjusted to any value between 350mA and 1.5A using
the on-board trimming potentiometer. PWM dimming can be
achieved by applying a pulse-width-modulated square wave
signal between the PWMD and GND pins.
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Board Layout and Connections
R
90-135Vac
60Hz
PWM Dimming
(optional)
B
D
50kHz
90VAC – 135VAC
1500mA maximum
(adjustable down to 350mA)
40V maximum
90% (typ.)
100.5mm x 57.5mm
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HV9910DB1
Instructions
ATTENTION:
The LED demo board and connected LEDs
are not isolated from line voltage. None of the demo board
terminals are galvanic isolated from the AC line voltage.
All measuring instruments, as scopes and meters must be
isolated from ground (floating) using isolating transformers.
Note:
Both terminals will have active live voltage when input
AC line is applied!
VDD:
This pin is connected to the VDD pin of the HV9910B.
The typical voltage on the pin is 7.6V. This voltage can be
used to drive any additional circuitry required. Please see
the datasheet regarding the output current capability at the
VDD pin.
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OUTPUT:
These two terminals are the output terminals of
the converter and must be connected to the LED string.
Positive-marked end is to be connected to positive (anode)
terminal of LED string, Negative-marked to be connected to
the negative (cathode) terminal.
PWM dimming of the LED light can be achieved by turning
on and off the converter with low frequency 50Hz to 1000Hz
TTL logic level signal. Changing the Duty Ratio of the signal
changes the effective average current via the LEDs, changing
the light emission.
Note:
In the case of PWM dimming, the PWMD pin should
not be connected to the VDD pin. Also, the signal generator
or the device applying the signal to PWMD pin must be
isolated from the input mains.
Testing HV9910DB1
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
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To just enable the converter, connect the PWMD pin to the
VDD pin. Disconnecting the PWMD pin will cause the circuit
to stop.
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PWMD:
This terminal can be used to either enable/disable
the converter or to apply a PWM dimming signal.
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GND:
This pin is connected to the Ground connection of the
buck converter.
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Open LED Test
Linear Dimming Test
PWM Dimming Test
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Note: Make sure the LED string is fully functional. One way
is to use a DC current limited source to test the string. A
40V/300mA power supply should be a good solution.
After the initial test of functionality, the demo board can be
tested at open LED string. The test is non-destructive and
not time restricted. Disconnect one end of the LEDs and
power up the demo. There will be no light emission and the
AC current withdrawn from the line will be very low. There is
no switching at the switching node.
Gradual change of current via LEDs is possible by using
the trimming potentiometer R5 placed on the demo board.
The HV9910B has a preset voltage reference level of
250mV when the voltage at the LD pin of the IC is above
250mV. The external resistor divider consisting of R2, R3
and potentiometer R5 can change that level by pulling down
the pin LD below 250mV, reducing the LED string current in
linear fashion.
The maximum output current of the HV9910DB1 is 1.5A. It
can be reduced using R5 or can be changed to ½ of it by
removing one of the two current sense resistors R4 and R6.
During normal demo board operation, by applying a PWM
TTL level signal to pin PWMD, the output current through the
LEDs can be changed in PWM fashion in a 0 to 100% range.
In this dimming mode, the output current has normally two
levels – zero and nominal current, except at very low duty
ratios where inductor current cannot ramp up to the nominal
value within the short time.
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Note:
Apply AC line voltage as a last step to power up LED
string,
after
you connect LED to demo board! A disconnected
LED string would not damage the board, however it is not
advisable.
An ammeter can be connected in series with the LEDs to
measure the output current. The current level can then be
changed by adjusting the trimming potentiometer.
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AC Input:
Connect these pins to a standard 120V line
voltage outlet (or a DC voltage between 100 – 200V). Use a
two-wire cable without ground connection.
be connected to the negative output. Connect the AC input
to the input terminals (there is no polarity to be considered).
Short the PWMD pin to VDD. Apply a 120VAC at input
terminals and the LED string should start to glow.
HV9910DB1
Schematic Diagram
C1
100uF, 160V
D21
FR1G-13
AC INPUT
1
2
F1
2A, 125V
U2
V+
V+
C11
B
1
D18
BYV26B
R1
464K
Q5
L2
V
DS
1
2
1000uH, 2A
IRF840
(D2PAK)
R4
0.27
R6
0.27
1uF, 250V
VDD
U3
12
13
J11
1
2
Conn_2pin
VIN
1
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AC1
AC2
POS
VDD
HD
EN
NEG
D20
FR1G-13
C12
2
1
NTC1
R
0.1uF, 250V
L1
C4
R2
178K
R5
5K
HV9910B
GND
C8
J16
J17
J18
J19
Bill of Materials
Qty
2
2
1
1
1
2
1
3
1
1
-
1
-
1
1
1
1
1
2
1
1
1
1
1
Ref
C1, C8
C4
C7
C11
J11, AC INPUT
PWMD
D19
FR1G-13
100uF, 160V
GND
C7
0.1uF,
25V
R3
1K
B
5
2.2uF, 16V
9
D
GATE
CS
8
4
C13
0.1uF, 250V
RT
3
4
14
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Description
Manufacturer
Onshore Tech.
Panasonic
Manufacturer’s
Part Number
ED555/2DS
EEU-EB2C101
ECJ-2FB1C225K
ECJ-2VF1E104Z
ECW-F2105JB
ECQ-U2A104MV
BYV26B
FR1G-13
0460002.UR
BU9-2820R5B
CTX01-17785-R
PCV-2-105-02
CTX01-17784G-R
CL-130
IRF840AS
ERJ-6ENF4643V
ERJ-6ENF1783V
ERJ-6ENF1001V
ERJ-14RQJR27U
CT-94W-502
HV9910BNG-G
DF04S
573100d00000
22-28-4030
Terminal block
100µF, 160V electrolytic capacitor
2.2µF, 16V SMD 0805 ceramic capacitor
0.1µF, 25V SMD 0805 ceramic capacitor
Panasonic
Panasonic
O
1µF, 250V metallized polypropylene capacitor
to
Panasonic
Panasonic
Philips
Diodes, Inc.
Littelfuse Inc
Coilcraft
Cooper Electronics
Coilcraft
Cooper Electronics
Thermometrics
International Rectifier
Panasonic
Panasonic
Panasonic
Panasonic
BC components
Supertex
Diodes, Inc.
Aavid Thermalloy
Molex/Waldom
C12, C13
D18
F1
L1
-
-
L2
0.1µF, 250V metallized polyester capacitors
400V, 1A SMB fast recovery diode
Slow Blo SMD 125V, 2A fuse
Cross reference for L1
Cross reference for L2
D19, D20, D21
R
NTC1
Q5
R1
R2
R3
R4, R6
R5
U1
U2
-
VDD, PWMD,
GND
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400V, 1.5A fast - soft recovery diode
Low profile common mode choke
1000µH, 2A inductor
NTC inrush current limiter
500V, 8A D2PAK MOSFET
464KΩ, 1/8W 0805 SMD resistor
178KΩ, 1/8W 0805 SMD resistor
1KΩ, 1/10W 0805 SMD resistor
0.27Ω, 1/4W 1210 resistor
Top adjust 5KΩ trim pot
Universal LED driver
400V, 1A, DF-S, single phase diode bridge
D2PAK heat sink
3-position breakaway header
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