Supertex HV9910B User manual

Supertex inc.
HV9910B
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
Features
Switch mode controller for single switch LED drivers
Enhanced drop-in replacement to the HV9910
Open loop peak current controller
Internal 8.0 to 450V linear regulator
Constant frequency or constant off-time operation
Linear and PWM dimming capability
Requires few external components for operation
Applications
DC/DC or AC/DC LED driver applications
RGB backlighting LED driver
Back lighting of flat panel displays
General purpose constant current source
Signage and decorative LED lighting
Chargers
►
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►
►
►
►
►
►
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General Description
The HV9910B is an open loop, current mode, control LED
driver IC. The HV9910B can be programmed to operate in
either a constant frequency or constant off-time mode. It
includes an 8.0 - 450V linear regulator which allows it to work
from a wide range of input voltages without the need for an
external low voltage supply. The HV9910B includes a PWM
dimming input that can accept an external control signal with a
duty ratio of 0 - 100% and a frequency of up to a few kilohertz.
It also includes a 0 - 250mV linear dimming input which can
be used for linear dimming of the LED current.
The HV9910B is ideally suited for buck LED drivers. Since
the HV9910B operates in open loop current mode control, the
controller achieves good output current regulation without the
need for any loop compensation. PWM dimming response is
limited only by the rate of rise and fall of the inductor current,
enabling very fast rise and fall times. The HV9910B requires
only three external components (apart from the power stage)
to produce a controlled LED current making it an ideal solution
for low cost LED drivers.
Typical Application Circuit
Universal High Brightness
LED Driver
CDD
RT
RCS
L1
Q1
D1 CO
CIN
HV9910B
VIN
GATE
PWMD
VDD
LD
CS
RT GND

2
HV9910B
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
-G indicates package is RoHS compliant (‘Green’)
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Parameter Value
VIN to GND -0.5V to +470V
VDD to GND 12V
CS, LD, PWMD, GATE, RT to GND -0.3V to (VDD +0.3V)
Junction temperature range -40°C to +150°C
Storage temperature range -65°C to +150°C
Continuous power dissipation (TA = +25°C)
8-Lead SOIC
16-Lead SOIC
630mW
1300mW
Sym Description Min Typ Max Units Conditions
Input
VINDC Input DC supply voltage range1* 8.0 - 450 V DC input voltage
IINSD Shut-down mode supply current * - 0.5 1.0 mA Pin PWMD to GND
Ordering Information
Device Package Options
8-Lead SOIC 16-Lead SOIC
HV9910B HV9910BLG-G HV9910BNG-G
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
8
7
6
5
1
2
3
4
VIN
CS
GND
GATE
RT
LD
VDD
PWMD
VIN
NC
NC
CS
GND
NC
NC
GATE
NC
NC
RT
LD
VDD
NC
NC
PWMD
Pin Description
Product Marking
Y = Last Digit of Year Sealed
WW = Week Sealed
L = Lot Number
= “Green” Packaging
YWW
9910B
LLLL
Y = Last Digit of Year Sealed
WW = Week Sealed
L = Lot Number
C = Country of Origin*
A = Assembler ID*
= “Green” Packaging
*May be part of top marking
Top Marking
Bottom Marking
HV9910BNG
YWW LLLLLLLL
CCCCCCCCC AAA
8-Lead SOIC (LG)
16-Lead SOIC (NG)
8-Lead SOIC (LG) 16-Lead SOIC (NG)
Electrical Characteristics (The specifications are at TA = 25°C and VIN = 12V, unless otherwise noted.)
Thermal Resistance
Package θja
8-Lead SOIC 128OC/W
16-Lead SOIC 82OC/W
Package may or may not include the following marks: Si or
Package may or may not include the following marks: Si or
Notes:
1. Also limited by package power dissipation limit, whichever is lower.
† VDD load current external to the HV9910B.
* Denotes the specifications which apply over the full operating ambient temperature range of -40°C < TA < +125°C.
# Guaranteed by design.

3
HV9910B
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
Sym Description Min Typ Max Units Conditions
Internal Regulator
VDD Internally regulated voltage - 7.25 7.5 7.75 V VIN = 8.0V, IDD(ext)
(†)
= 0, 500pF at
GATE; RT = 226kΩ, PWMD = VDD
ΔVDD, line Line regulation of VDD - 0 - 1.0 V VIN = 8.0 - 450V, IDD(ext) = 0, 500pF at
GATE; RT = 226kΩ, PWMD = VDD
Internal Regulator
ΔVDD, load Load regulation of VDD - 0 - 100 mV IDD(ext) = 0 - 1.0mA, 500pF at GATE;
RT = 226kΩ, PWMD = VDD
UVLO VDD undervoltage lockout threshold * 6.45 6.7 6.95 V VDD rising
∆UVLO VDD undervoltage lockout hysteresis - - 500 - mV VDD falling
IIN,MAX
Current that the regulator can
supply before IC goes into UVLO # 5.0 - - mA VIN = 8.0V
PWM Dimming
VEN(lo) Pin PWMD input low voltage * - - 0.8 V VIN = 8.0 - 450V
VEN(hi) Pin PWMD input high voltage * 2.0 - - V VIN = 8.0 - 450V
REN
Pin PWMD pull-down resistance
at PWMD - 50 100 150 kΩ VPWMD = 5.0V
Current Sense Comparator
VCS,TH
Current sense pull-in threshold
voltage -225 250 275 mV -40°C < TA < +85°C
213 250 287 TA < +125°C
VOFFSET Offset voltage for LD comparator * -12 - 12 mV ---
TBLANK Current sense blanking interval
- 150 215 280
ns
0 < TA < +85OC, VLD = VDD,
VCS = VCS,TH + 50mV after TBLANK
- 145 215 315 -40 < TA < +125OC, VLD = VDD,
VCS = VCS,TH + 50mV after TBLANK
tDELAY Delay to output - - 80 150 ns VLD = VDD,
VCS = VCS,TH + 50mV after TBLANK
Oscillator
fOSC Oscillator frequency - 20 25 30 kHz RT = 1.00MΩ
- 80 100 120 RT = 226kΩ
GATE Driver
ISOURCE GATE sourcing current - 165 - - mA VGATE = 0V, VDD = 7.5V
ISINK GATE sinking current - 165 - - mA VGATE = VDD, VDD = 7.5V
tRISE GATE output rise time - - 30 50 ns CGATE = 500pF, VDD = 7.5V
tFALL GATE output fall time - - 30 50 ns CGATE = 500pF, VDD = 7.5V
Notes:
1. Also limited by package power dissipation limit, whichever is lower.
† VDD load current external to the HV9910B.
* Denotes the specifications which apply over the full operating ambient temperature range of -40°C < TA < +125°C.
# Guaranteed by design.
Electrical Characteristics (cont.) (The specifications are at TA = 25°C and VIN = 12V, unless otherwise noted.)

4
HV9910B
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
The HV9910B is optimized to drive buck LED drivers using
open-loop peak current mode control. This method of control
enables fairly accurate LED current control without the need
for high side current sensing or the design of any closed loop
controllers. The IC uses very few external components and
enables both Linear and PWM dimming of the LED current.
A resistor connected to the RT pin programs the frequency
of operation (or the off-time). The oscillator produces pulses
at regular intervals. These pulses set the SR flip-flop in the
HV9910B which causes the GATE driver to turn on. The same
pulses also start the blanking timer which inhibits the reset
input of the SR flip flop and prevent false turn-offs due to the
turn-on spike. When the FET turns on, the current through
the inductor starts ramping up. This current flows through
the external sense resistor RCS and produces a ramp voltage
at the CS pin. The comparators are constantly comparing
the CS pin voltage to both the voltage at the LD pin and
the internal 250mV. Once the blanking timer is complete, the
output of these comparators is allowed to reset the flip flop.
When the output of either one of the two comparators goes
high, the flip flop is reset and the GATE output goes low. The
GATE goes low until the SR flip flop is set by the oscillator.
Assuming a 30% ripple in the inductor, the current sense
resistor RCS can be set using:
RCS = 0.25V (or VLD)
1.15 • ILED (A)
Constant frequency peak current mode control has an in-
herent disadvantage – at duty cycles greater than 0.5, the
control scheme goes into subharmonic oscillations. To pre-
vent this, an artificial slope is typically added to the current
sense waveform. This slope compensation scheme will af-
fect the accuracy of the LED current in the present form.
However, a constant off-time peak current control scheme
does not have this problem and can easily operate at duty
cycles greater then 0.5 and also gives inherent input volt-
age rejection making the LED current almost insensitive to
input voltage variations. But, it leads to variable frequency
operation and the frequency range depends greatly on the
input and output voltage variation. HV9910B makes it easy
to switch between the two modes of operation by changing
one connection (see oscillator section).
Input Voltage Regulator
The HV9910B can be powered directly from its VIN pin and
can work from 8.0 - 450VDC at its VIN pin. When a voltage
is applied at the VIN pin, the HV9910B maintains a constant
7.5V at the VDD pin. This voltage is used to power the IC
and any external resistor dividers needed to control the IC.
The VDD pin must be bypassed by a low ESR capacitor to
provide a low impedance path for the high frequency current
of the output GATE driver.
The HV9910B can also be operated by supplying a voltage
at the VDD pin greater than the internally regulated voltage.
This will turn off the internal linear regulator of the IC and the
HV9910B will operate directly off the voltage supplied at the
VDD pin. Please note that this external voltage at the VDD
pin should not exceed 12V.
Although the VIN pin of the HV9910B is rated up to 450V,
the actual maximum voltage that can be applied is limited
by the power dissipation in the IC. For example, if an 8-pin
SOIC (junction to ambient thermal resistance Rθ,j-a = 128°C/
W) HV9910B draws about IIN = 2.0mA from the VIN pin, and
has a maximum allowable temperature rise of the junction
temperature limited to about ΔT = 100°C, the maximum volt-
age at the VIN pin would be:
In these cases, to operate the HV9910B from higher input
voltages, a Zener diode can be added in series with the VIN
pin to divert some of the power loss from the HV9910B to
the Zener diode. In the above example, using a 100V zener
diode will allow the circuit to easily work up to 450V.
The input current drawn from the VIN pin is a sum of the
1.0mA current drawn by the internal circuit and the current
drawn by the GATE driver (which in turn depends on the
switching frequency and the GATE charge of the external
FET).
IIN ≈ 1.0mA + QG • fS
In the above equation, fS is the switching frequency and QG
is the GATE charge of the external FET (which can be ob-
tained from the datasheet of the FET).
Application Information

5
HV9910B
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
Current Sense
The current sense input of the HV9910B goes to the non-
inverting inputs of two comparators. The inverting terminal
of one comparator is tied to an internal 250mV reference
whereas the inverting terminal of the other comparator is
connected to the LD pin. The outputs of both these com-
parators are fed into an OR GATE and the output of the OR
GATE is fed into the reset pin of the flip-flop. Thus, the com-
parator which has the lowest voltage at the inverting terminal
determines when the GATE output is turned off.
The outputs of the comparators also include a 150-280ns
blanking time which prevents spurious turn-offs of the exter-
nal FET due to the turn-on spike normally present in peak
current mode control. In rare cases, this internal blanking
might not be enough to filter out the turn-on spike. In these
cases, an external RC filter needs to be added between the
external sense resistor (RCS) and the CS pin.
Please note that the comparators are fast (with a typical
80ns response time). Hence these comparators are more
susceptible to be triggered by noise than the comparators
of the HV9910. A proper layout minimizing external induc-
tances will prevent false triggering of these comparators.
Oscillator
The oscillator in the HV9910B is controlled by a single re-
sistor connected at the RT pin. The equation governing the
oscillator time period tOSC is given by:
tOSC(μs) = RT(kΩ) + 22
25
If the resistor is connected between RT and GND, HV9910B
operates in a constant frequency mode and the above equa-
tion determines the time-period. If the resistor is connected
between RT and GATE, the HV9910B operates in a constant
off-time mode and the above equation determines the off-
time.
GATE Output
The GATE output of the HV9910B is used to drive an ex-
ternal FET. It is recommended that the GATE charge of the
external FET be less than 25nC for switching frequencies
≤100kHz and less than 15nC for switching frequencies >
100kHz.
Linear Dimming
The Linear Dimming pin is used to control the LED current.
There are two cases when it may be necessary to use the
Linear Dimming pin.
► In some cases, it may not be possible to find the exact
RCS value required to obtain the LED current when the
internal 250mV is used. In these cases, an external volt-
age divider from the VDD pin can be connected to the LD
pin to obtain a voltage (less than 250mV) corresponding to
the desired voltage across RCS.
► Linear dimming may be desired to adjust the current
level to reduce the intensity of the LEDs. In these cases,
an external 0-250mV voltage can be connected to the LD
pin to adjust the LED current during operation.
To use the internal 250mV, the LD pin can be connected to
VDD.
Note:
Although the LD pin can be pulled to GND, the output cur-
rent will not go to zero. This is due to the presence of a mini-
mum on-time (which is equal to the sum of the blanking time
and the delay to output time) which is about 450ns. This will
cause the FET to be on for a minimum of 450ns and thus the
LED current when LD = GND will not be zero. This current is
also dependent on the input voltage, inductance value, for-
ward voltage of the LEDs and circuit parasitics. To get zero
LED current, the PWMD pin has to be used.
PWM Dimming
PWM Dimming can be achieved by driving the PWMD pin
with a low frequency square wave signal. When the PWM
signal is zero, the GATE driver is turned off and when the
PWMD signal if high, the GATE driver is enabled. Since the
PWMD signal does not turn off the other parts of the IC,
the response of the HV9910B to the PWMD signal is almost
instantaneous. The rate of rise and fall of the LED current is
thus determined solely by the rise and fall times of the induc-
tor current.
To disable PWM dimming and enable the HV9910B perma-
nently, connect the PWMD pin to VDD.

6
HV9910B
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
Pin Description
Block Diagram
Pin # Function Description
8-Lead SOIC 16-Lead SOIC
1 1 VIN This pin is the input of an 8.0 - 450V linear regulator.
2 4 CS
This pin is the current sense pin used to sense the FET current by means
of an external sense resistor. When this pin exceeds the lower of either the
internal 250mV or the voltage at the LD pin, the GATE output goes low.
3 5 GND Ground return for all internal circuitry. This pin must be electrically con-
nected to the ground of the power train.
4 8 GATE This pin is the output GATE driver for an external N-channel power
MOSFET.
5 9 PWMD
This is the PWM dimming input of the IC. When this pin is pulled to GND,
the GATE driver is turned off. When the pin is pulled high, the GATE driver
operates normally.
6 12 VDD This is the power supply pin for all internal circuits.
It must be bypassed with a low ESR capacitor to GND (≥0.1μF).
7 13 LD This pin is the linear dimming input and sets the current sense threshold as
long as the voltage at the pin is less than 250mV (typ).
8 14 RT
This pin sets the oscillator frequency. When a resistor is connected be-
tween RT and GND, the HV9910B operates in constant frequency mode.
When the resistor is connected between RT and GATE, the IC operates in
constant off-time mode.
-2, 3, 6, 7, 10,
11, 15, 16 NC No connection
POR
250mV
RT PWMD
GATE
VDD
VIN
LD
CS
GND
S
RQ
Blanking
Oscillator
Regulator
+
-
+
-

7
HV9910B
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
8-Lead SOIC (Narrow Body) Package Outline (LG)
4.90x3.90mm body, 1.75mm height (max), 1.27mm pitch
1
8
Seating
Plane
Gauge
Plane
L
L1
L2
E
E1
D
eb
AA2
A1
Seating
Plane
A
A
Top View
Side View
View B
View B
θ1
θ
Note 1
(Index Area
D/2 x E1/2)
View A-A
h
h
Note 1
Symbol A A1 A2 b D E E1 e h L L1 L2 θ θ1
Dimension
(mm)
MIN 1.35* 0.10 1.25 0.31 4.80* 5.80* 3.80*
1.27
BSC
0.25 0.40
1.04
REF
0.25
BSC
0O5O
NOM - - - - 4.90 6.00 3.90 - - - -
MAX 1.75 0.25 1.65* 0.51 5.00* 6.20* 4.00* 0.50 1.27 8O15O
JEDEC Registration MS-012, Variation AA, Issue E, Sept. 2005.
* This dimension is not specified in the JEDEC drawing.
Drawings are not to scale.
Supertex Doc. #: DSPD-8SOLGTG, Version I041309.
Note:
This chamfer feature is optional. A Pin 1 identifier must be located in the index area indicated. The Pin 1 identifier can be: a molded mark/identifier;
an embedded metal marker; or a printed indicator.
1.

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)
©2010 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: [phone]
www.supertex.com
8
HV9910B
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline
information go to http://www.supertex.com/packaging.html.)
Doc.# DSFP-HV9910B
B061209
16-Lead SOIC (Narrow Body) Package Outline (NG)
9.90x3.90mm body, 1.75mm height (max), 1.27mm pitch
Symbol A A1 A2 b D E E1 e h L L1 L2 θ θ1
Dimension
(mm)
MIN 1.35* 0.10 1.25 0.31 9.80* 5.80* 3.80*
1.27
BSC
0.25 0.40
1.04
REF
0.25
BSC
0O5O
NOM - - - - 9.90 6.00 3.90 - - - -
MAX 1.75 0.25 1.65* 0.51 10.00* 6.20* 4.00* 0.50 1.27 8O15O
JEDEC Registration MS-012, Variation AC, Issue E, Sept. 2005.
* This dimension is not specified in the JEDEC drawing.
Drawings are not to scale.
Supertex Doc. #: DSPD-16SONG, Version G041309.
D
Seating
Plane
Gauge
Plane
L
L1
L2
Top View
Side View View A-A
View B
View
B
θ1
θ
E1 E
AA2
A1
A
A
Seating
Plane
eb
h
h
16
1
Note 1
Note 1
(Index Area
D/2 x E1/2)
Note:
This chamfer feature is optional. If it is not present, then a Pin 1 identifier must be located in the index area indicated. The Pin 1 identifier can be:
a molded mark/identifier; an embedded metal marker; or a printed indicator.
1.

Supertex inc.
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
1
General Description
The HV9910BDB1 demoboard is an offline, high current
LED driver designed to drive a 40V LED string at 1.4A from
a 110V input. The demoboard uses Supertex’s HV9910B
LED driver IC to drive a buck converter.
The HV9910BDB1 has a typical full load efficiency of 88%,
with the buck converter efficiency (excluding the diode
bridge rectifier and EMI filter) at 93%. The demoboard also
meets CISPR-15 conducted EMI standards.
The output current can be adjusted in two ways - either
with linear dimming using the onboard potentiometer or
with PWM dimming by applying a TTL-compatible square
wave signal at the PWMD terminal. Using linear dimming,
the output current of the HV9910DB1 can be lowered to
about 0.1A (note: zero output current can be obtained only
by PWM dimming).
Connection Diagram
HV9910BDB1
Off-Line, High Brightness, 1.4A
LED Driver Demo Board
WARNING!!!
Do not connect earth-grounded test instruments. Doing so will short the AC line, resulting in damage to the
instrument and/or the HV9910BDB1. Use floating high voltage differential probes or isolate the demoboard
by using an isolating transformer.
There is no galvanic isolation. Dangerous voltages are present when connected to the AC line.
Specifications
Input voltage 90 - 135Vrms, 50/60Hz
Output voltage 10 - 40V
Output current 1.4A max
Output current ripple (typ) 40% (peak-peak)
Full load efficiency (@110V) 88%
Power factor (@110V) 0.64
Input current (@110V) 0.83A rms
Input current THD (@110V) 117%
Switching frequency (typ) 50kHz
Minimum output current (@110V) 0.1A
Conducted EMI Meets CISPR-15
Temperature rise of heatsink
(@110V input and full load) 50°C
Open LED protection yes
Output short circuit protection no
Dimensions 86.4mm X 58.4mm
90 - 135VAC
50/60Hz
10 - 40V, 1.4A max.

2
HV9910BDB1
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
Connections
1. Connect the input AC voltage between the AC IN terminals as shown in the connection diagram.
2. Connect the LED string between LED+ (anode of LED string) and LED- (cathode of LED string).
3. Connect the PWMD terminal to the VDD terminal using the jumper provided to enable the LED driver.
4. The current level can be adjusted using the on-board potentiometer.
PWM Dimming
The HV9910BDB1 is capable of being PWM dimmed by applying a square wave TTL compatible signal between PWMD
and GND terminals. However, since there is no galvanic isolation on the board, care must be taken to prevent damage to
the PWM dimming source and/or the HV9910BDB1. One simple way is to isolate the LED driver from the AC line using an
isolation transformer. Another approach is to use an opto-isolator to drive the PWMD pin as shown in the figure below.
VDD
PWMD
Opto-isolator
(eg: LTV-814 from Lite-On)
5.0V
square wave signal
(<1.0kHz)
3.8kΩ
Full Load Efficiency vs. Input Voltage
86
87
88
89
90 100 110 120 130 140
Input Voltage (Vrms)
Efficiency (%)
Efficiency vs. Load Voltage (@VIN=110V rms)
74
78
82
86
90
5 15 25 35 45
Load Voltage (V)
Efficiency (%)
Load Regulation of Load Current
(@ VIN = 110V rms)
0
2.5
5
7.5
10
12.5
15
5 15 25 35 45
Load Voltage (V)
Change in output current (%)
Line Regulation of Load Current
-5
-2.5
0
2.5
5
90 100 110 120 130 140
Input Voltage (Vrms)
Change in output current (%)
Typical Results

3
HV9910BDB1
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
Waveforms
Steady State waveforms at 150Vdc input and full
load output
LED Current
Drain Voltage
PWM Dimming at 100Hz
LED Current
PWMD Voltage
Steady State waveforms at 150Vdc input and full
load output
Input Voltage
Input
Current
Rising Edge of LED Current during PWM Dimming
LED Current
PWMD Voltage
Falling Edge of LED Current during PWM Dimming
LED Current
PWMD Voltage

4
HV9910BDB1
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
Conducted EMI Measurements at Full Load and 110V AC input
CISPR-15 Limit
Silk Screen

5
HV9910BDB1
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
Schematic Diagram
t
RT1
CL-130
0
12
L1
1000µH
2A
0
1
4
3
2-+
D2
DF1504S-T
R4
0.0
D1
MURS240
Q1
FQD8N25
12
1
2
J1
1
2
4
3
L2
R5
1k
F1
2A
125V
1
C4
0.1µF
250V
4
MOV1
R
ERZ-V05D221
1
2
J2
1
J3A
23
1
LD
13
PWMD
9
5
CS
4
GATE
8
RT
14
VIN
12
HV9910B
U1
C5
0.1µF
250V
C1
1.0µF
250V
0
C10
1.0µF
250VC2
0.47µF
250V
C6
2.2µF
16V
R7
0.27
0.25W
R7
0.27
0.25W
C1
1.0µF
250V
J3C
J3B
C8
0.1µF
16V
R6
1k
R2
178k
R3
5k
R1
464k
L3
22µH
C3
68µF
200V
C7
68µF
200V
VDD
GND

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)
©2010 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: [phone]
www.supertex.com
6
HV9910BDB1
Bill of Materials
Item
#Qty RefDes Description Package Manufacturer Manufacturer’s Part Number
1 2 C1, C10 1µF, 250V metallized polyester capacitor Radial EPCOS Inc B32522C3105J
2 1 C2 0.47µF, 250V metallized polyester ca-
pacitor Radial EPCOS Inc B32521C3474J
3 2 C3, C7 68µF, 250V electrolytic capacitor Radial Panasonic EEU-EE2D680
4 2 C4, C5 0.1µF, 250V metallized polyester X2
capacitor Radial Panasonic ECQ-U2A104MV
5 1 C6 2.2µF, 16V, X7R ceramic chip capacitor SMD0805 --- ---
6 1 C8 0.1µF, 50V, X7R ceramic chip capacitor SMD0805 --- ---
7 1 C9 open --- --- ---
8 1 D1 400V, 2A ultra fast recovery diode SMB ON Semi MURS240T3
9 1 D2 400V, 1.5A single phase diode bridge DF-S Diodes Inc DF1504S-T
10 1 F1 2A, 125V slow blow fuse SMT Littelfuse Inc 0452002.MRL
11 2 J1, J2 2 position 0.156” header Thru-Hole Molex 26-48-1021
12 1 J3 3 position, 0.1” pitch vertical header Thru-Hole Molex 22-28-4030
13 1 L1 1000µH, 2A rms, 2A sat inductor Radial Coilcraft PCV-2-105-02L
- - --- Cross Reference Radial Coiltronics CTX01-17784G-R
14 1 L2 0.6mH, 1A rms common mode choke Thru-Hole Coilcraft BU9-6011R0BL
15 1 L3 22µH, 2.1A sat, 1.9A rms inductor Radial Coilcraft RFB0807-220L
16 1 MOV1 220V, 600A surge absorber Radial Panasonic ERZ-V05D221
17 1 Q1 250V, 0.55Ω, N-channel FET DPAK Fairchild Semi FQD8N25
18 1 RT1 2A rms, 50Ω inrush current limiter Radial GE Sensing CL-130
19 1 R1 464KΩ, 1/8W, 1% chip resistor SMD0805 --- ---
20 1 R2 178KΩ, 1/8W, 1% chip resistor SMD0805 --- ---
21 1 R3 5KΩ 6mmsq single turn potentiometer SMT Bourns Inc 3361P-1-502GLF
22 1 R4 0.0Ω, 1/8W chip resistor SMD0805 --- ---
23 2 R5, R6 1KΩ, 1/8W, 1% chip resistor SMD0805 --- ---
24 2 R7, R8 0.27Ω, 1/4W, 1% chip resistor SMD1206 --- ---
25 1 U1 Universal LED Driver SO-16 Supertex HV9910BNG-G
100410

● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
1
90 - 265VAC
50/60Hz
10 - 40V,
350mA max.
General Description
The Supertex HV9910BDB2 demo board is a High-
Brightness LED power driver to supply a string of LEDs
using the HV9910B IC from a universal AC input voltage.
The HV9910BDB2 can supply a maximum output current
of 350mA to drive 10 - 40V LED strings from a wide input
voltage - 90 to 265VAC, 50/60Hz.
The power conversion stage of the HV9910BDB2 consists
of a diode bridge rectifier followed by a current-controlled
buck converter operating at a switching frequency of
50kHz. The nominal output current of the demo board can
be adjusted to any value between 30 and 350mA 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. Zero
output current can be obtained only by PWM dimming.
The HV9910BDB2 is not CISPR-15 compliant. Additional
filtering is required to make the board meet CISPR-15
limits.
Connection Diagram
HV9910BDB2
Universal, Off-Line, High Brightness,
350mA LED Driver Demo Board
WARNING!!!
Do not connect earth-grounded test instruments. Doing so will short the AC line, resulting in damage to the instrument and/or
the HV9910BDB2. Use floating high voltage differential probes or isolate the demoboard by using an isolating transformer.
There is no galvanic isolation. Dangerous voltages are present when connected to the AC line.
Specifications
Parameter Value
Input voltage 90 - 265Vrms, 50/60Hz
Output voltage 10 - 40V
Output current 350mA max
Output current ripple (typ)
@110V input
25% (peak-peak)
@40V output, 350mA
Full load efficiency 88% @110VAC
86% @230VAC
Power factor 0.70 @110VAC
0.48 @230VAC
Input current (rms) 0.20A @110VAC
0.14A @230VAC
Input current THD 94% @110VAC
95% @230VAC
Switching frequency (typ) 50kHz
Minimum output current 20mA @110VAC
30mA @230VAC
Open LED protection yes
Output short circuit protection no
Dimensions 68.6mm X 49.6mm

2
HV9910BDB2
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
Connections
Connect the input AC voltage between the AC IN
terminals as shown in the connection diagram.
Connect the LED string between LED+ (anode of LED
string) and LED- (cathode of LED string).
Connect the PWMD terminal to the VDD terminal using
the jumper provided to enable the LED driver.
The current level can be adjusted using the on-board
potentiometer.
1.
2.
3.
4.
PWM Dimming
The HV9910BDB2 is capable of being PWM dimmed by
applying a square wave TTL compatible signal between
PWMD and GND terminals. However, since there is no
galvanic isolation on the board, care must be taken to
prevent damage to the PWM dimming source and/or the
HV9910BDB2. One simple way is to isolate the LED driver
from the AC line using an isolation transformer. Another
approach is to use an opto-isolator to drive the PWMD pin
as shown in the figure below.
VDD
PWMD
Opto-isolator
(eg: LTV-814 from Lite-On)
5.0V
square wave signal
(<1.0kHz)
3.8kΩ
Efficiency vs.Input Voltage
60
65
70
75
80
85
90
80 130 180 230 280
Input Voltage (VAC)
Efficiency (%)
40V output
10V output
Efficiency vs. LED String Voltage
60
65
70
75
80
85
90
0 10 20 30 40 50
LED String Voltage (V)
Efficiency (%)
110VAC Input
230VAC Input
Current Regulation vs. Input Voltage
-10
-5
0
5
10
80 130 180 230 280
Input Voltage (VAC)
% change in LED Current
40V Ouput
10V Output
Current Regulation vs. LED String
Voltage
0
5
10
15
20
0 10 20 30 40 50
LED String Voltage (V)
% change in LED Current
110VAC Input
230VAC Input
Typical Results

3
HV9910BDB2
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
Waveforms
Steady State waveforms at 110VAC input and full
load output
LED Current
Drain Voltage
Steady State waveforms at 230VAC input and full
load output
LED Current
Drain Voltage
Steady State waveforms at 90VAC input and
40V, 350mA output
LED Current
Drain Voltage
Steady State waveforms at 230VAC input and
10V, 350mA output
LED Current
Drain Voltage

4
HV9910BDB2
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
Silk Screen

5
HV9910BDB2
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com
Schematic Diagram
t
RT1
CL-140
C4
0.1uF, 305VAC
12
L1
4.7mH
C3
0.47uF, 400V
R1
464K
R6
0.56
C1
22uF, 400V
D1
STTH2R06U
Vin 1
HD
13
EN
9
Gnd
5
CS4
Gate8
Rosc14
Vdd
12
HV9910
U2
1
2
J2
1
2
J1
F1
2A,250VAC
R2
178K
R7
1K
C6
0.1uF
C8
2.2uF, 16V
R5
1k
1
J3A
R3
5K
RL-1292-4700
C5
0.47uF, 400V
AC1
AC2
POS
NEG
U1
2
J3B
3
J3C
Q1
STD7NM50N
R4
1k
C7
100pF

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.
©2009 All rights reserved. Unauthorized use or reproduction is prohibited.
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: [phone]
www.supertex.com
6
HV9910BDB2
Bill of Materials
012309
Item
#Qty RefDes Description Package Manufacturer Manufacturer’s Part Number
1 1 C1 22µF, 400V electrolytic capacitor Radial Nichion UVR2G220MHD
2 2 C3,C5 0.47µF, 400V metal film capacitor Radial EPCOS Inc B32522C6474K
3 1 C4 0.1µF, 305VAC EMI suppresion
capacitor Radial EPCOS Inc B32922C3104M
4 1 C6 0.1µF, 16V X7R ceramic chip capacitor SMD0805 Panasonic ECJ-2VB1C104K
5 1 C7 100pF, 50V C0G ceramic chip
capacitor SMD0805 TDK Corp C2012C0G1H101J
6 1 C8 2.2µF, 16V X7R ceramic chip capacitor SMD0805 TDK Corp C2012X7R1C225K
7 1 D1 600V, 2A ultrafast diode SMB ST Micro STTH2R06U
8 1 F1 2A, 250VAC time lag fuse Radial Cooper
Bussman SR-5-2A-BK
9 1 H1 15C/W DPAK heatsink SMT Aavid 7106PD
10 2 J1,J2 2 position, 0.156” pitch, vertical header Thru-Hole Molex 26-48-1021
11 1 J3 3 position, 0.100” pitch, vertical header Thru-Hole Molex 22-03-2031
12 1 L1 4.7mH, 400mA rms,
470mA sat inductor Axial Renco USA RL-1292-4700
13 1 Q1 550V, 0.7Ω N-channel FET DPAK ST Micro STD5NM50
14 1 RT1 50Ω NTC inrush limiter Thru-Hole GE Sensing CL-140
15 1 R1 464KΩ, 1/8W, 1% chip resistor SMD0805 --- ---
16 1 R2 178KΩ, 1/8W, 1% chip resistor SMD0805 --- ---
17 1 R3 5KΩ top adjust trimpot SMT Bourns Inc 3361P-1-502G
18 3 R4,R5,R7 1KΩ, 1/8W, 1% chip resistor SMD0805 --- ---
19 1 R6 0.56Ω, 1/4W, 1% chip resistor SMD1206 --- ---
20 1 U1 400V, 1A single phase diode bridge DF-S Diodes Inc DF04S
21 1 U2 Universal LED Driver SO-16 Supertex HV9910BNG-G