Supertex inc.
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
HV816
Features
►360VPP output voltage for high brightness
►Large output load capability of up to 150nF
►2.7 to 5.5V operating supply voltage
►Single lithium ion cell compatible
►Adjustable output regulation for dimming
►External switching MOSFET
►Low audible noise
►Output discharge slew rate control
►1.5V logic
►Dedicated Enable pin
►Two EL frequency controls
►Independent lamp and converter frequency setting
►Split supply capability
►Available in 16-Lead 4x4 QFN package
Applications
►Laptop keyboards
►Netbook keyboards
►Display signs
►Portable instrumentation equipment
►Electronic organizers
General Description
The Supertex HV816 is a high voltage Electroluminescent
(EL) lamp driver designed for driving a lamp capacitance of
up to 150nF, or an area of approximately 42 square inches.
It is comprised of a boost converter followed by an H-bridge.
The boost converter produces a regulated output voltage,
which is set at a nominal value of 180V using an internal refer-
ence voltage. The H-bridge is used to produce a differential
output drive and the EL lamp will therefore see ±180V (360V
peak-to-peak). The HV816 has two internal oscillators, one
for controlling the boost converter switching frequency and
the other for controlling the H-bridge switching frequency.
Having separate control of each switching frequency allows
exibility in the circuit design.
High Voltage, Dimmable
EL Lamp Driver
The operating input supply voltage is 2.7 to 5.5V, but the En-
able (EN) and Select (SEL) interface to the device will accept
logic high levels down to 1.5V. The EN input is for turning the
device ON and OFF. The SEL input is for external logic control
of the H-bridge switching frequency, if required.
The HV816 boost converter stage uses a single inductor and
a minimum number of external components. The input voltage
to the inductor can be different from the input voltage to the
HV816 (split supply). The external inductor is connected either
between the LX and VDD pins or, for split supply applications,
between the LX pin and a higher voltage supply (shown as VIN
in the Block Diagram). An external MOSFET has to be driven
by the switch oscillator to generate a high voltage. The switch-
ing frequency for this MOSFET is set by an external resistor
connected between the RSW-Osc pin and the supply pin VDD.
During operation, the external switching MOSFET turns on and
allows energy to be stored in the inductor; this energy is trans-
ferred into the capacitor CS when the MOSFET turns off. The
voltage at the CS pin will increase with every switching cycle.
Once the voltage at the CS pin reaches the desired regulation
limit, nominally 180V, the external switching MOSFET is turned
OFF to conserve power.
The CS capacitor is connected between the CS pin and ground;
the CS pin is internally connected to the H-bridge. Energy from
the boost converter stage is stored in the capacitor before being
transferred to the EL lamp. Depending on the EL lamp sizes, a
1.0nF to 15nF capacitor should be used for CS.
The EL lamp switching frequency can be in the range of 100Hz
to 1.0kHz. This frequency can be set by either an external
logic signal at the SEL pin, with a frequency that is 4 times the
desired EL lamp switching frequency, or by an external resis-
tor connected between the REL-Osc and VDD pins. If external
frequency is input to the device at the SEL pin, the REL-Osc
pin should be connected to ground.
The HV816 has the provision to control the discharge rate of
the output to minimize audible noise emitted by the EL lamp,
which is connected between the VA and VB pins. An external
resistor from the RSLEW-OUT pin to ground controls the VA,
VB output discharge rate.
EL lamp dimming can be accomplished by changing the input
voltage to the VREG pin. The VREG pin allows an external
voltage source to control the VCS amplitude. The VCS voltage is
approximately 143 times the voltage at the VREG pin.
2
HV816
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
Fig. 1 : Typical Application Circuit
Block Diagram
HV816
ES1D
RREG = 3.3MΩ
RSW = 1.0MΩ
REL = 1.0MΩ
RSLEW = 100kΩ
ON = 1.5V to VDD
OFF = 0V to 0.2V
CEL
80nF
VREG VOUT VDRIVE LX GATE
CS
VA
VB
EN
SEL
VDD
REL-Osc
RSW-Osc
RSLEW-OUT GND HVGND
CFEL
100nF
CSW
100nF
CDD
47µF
VDD
CIN
47µFCG
0.1µF
LX = 22µH
(Cooper DR1030-220-R)
Vishay
Si7820DN
VIN
CS
12nF
200V
EL
Lamp
VSENSE
SEL
REL-Osc
VOUT
RSLEW-OUT
RSLEW
RSW-Osc
RSW
VREG
60pF
RREG
REL
EL
Frequency
2x EL
Frequency
1.26V
VREF
Output
Drivers VCS
VCS
VA
VB
CDD
Device
Enable
VDD LX VDRIVE GATE CS
CS
CG
CIN
VIN D
LX
VDD
EN
Input Logic Control:
ON = 1.5V to VDD
OFF = 0 to 0.2V
External EL
Frequency Control
GND
HVGND HV816
PWM Switch
Oscillator
0 to 88%
7V Linear
Regulator
+
-
3
HV816
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
-G indicates package is RoHS compliant (‘Green’)
Absolute Maximum Ratings
Parameter Value
Supply voltage, VDD -0.5 to +7.0V
Output voltage, VCS -0.5 to +215V
Junction temperature +125°C
Storage temperature -65°C to +150°C
Power dissipation:
16-Lead QFN 1.6W
Absolute Maximum Ratings are those values beyond which damage to the device may
occur. Functional operation under these conditions is not implied. Continuous operation
of the device at the absolute rating level may affect device reliability. All voltages are
referenced to device ground.
Pin Conguration
Product Marking
16-Lead QFN (K6)
Sym Parameter Min Typ Max Units Conditions
Recommended Operating Conditions
VDD Supply voltage 2.7 - 5.5 V ---
fSW Switching frequency 50 - 200 kHz ---
fEL EL output frequency 100 - 1000 Hz ---
SEL Input for EL output frequency 400 - 4000 Hz SEL = 4* (fEL) and 50% duty cycle
RSLEW Output discharge slew rate control resistor 100 - 500 kΩ ---
CEL EL lamp load capacitance 0 - 150 nF ---
TjOperating temperature -40 - +85 OC ---
16-Lead QFN (K6)
(top view)
Center heat slug is at ground potential.
Pads are at the bottom of the package.
Package may or may not include the following marks: Si or
Y = Last Digit of Year Sealed
W = Code for Week Sealed
L = Lot Number
= “Green” Packaging
H816
YWLL
CS
VA
VB
EN
VOUT VDD GND RSLEW-OUT
RSW-Osc
REL-Osc
SEL
VREG
LX GATE VDRIVE HVGND
1
16
ESD Sensitive Device
Ordering Information
Part Number Package Packing
HV816K6-G 16-Lead (4x4) QFN 3000/Reel
4
HV816
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
Electrical Characteristics
DC Characteristics (Over recommended operating conditions unless otherwise specied - TJ = 25°C)
Sym Parameter Min Typ Max Units Conditions
VCS Output regulation voltage 160 180 200 V VDD = 2.7 to 5.5V
VLAMP Differential output voltage 320 360 400 V VDD = 2.7 to 5.5V
IDDQ Quiescent VDD supply current - - 2.0 µA VDD = 5.5V, EN = Low
IDD Input current going into the VDD pin - - 3.0 mA VDD = 2.7 to 5.5V, VIN = 5.0V,
CEL = 80nF, see Fig. 1
IIN-LOAD
Input current including inductor current
with load - - 380 mA
VDD = 5.5V, VIN = 5.0V,
REL = 1.0MΩ, RSW = 1.0MΩ,
see Fig. 1
IIN-NOLOAD
Input current including inductor current
without load - - 80 mA VDD = 2.7 to 5.5V, VIN = 5.0V
No Load, see Fig. 1
IINQ
Quiescent VIN (inductor input voltage)
supply current - - 10 µA VIN = 10V, EN = Low,
see Fig. 1
VREG External input voltage range 0 - 1.33 V VDD = 2.7 to 5.5V
fEL EL lamp frequency - 200 - Hz REL = 1.0MΩ
fSW External MOSFET switching frequency - 90 - kHz RSW = 1.0MΩ
D External MOSFET duty cycle - - 88 % ---
VIH EN, SEL logic pins input high level 1.5 - VDD V VDD = 2.7 to 5.5V
VIL EN, SEL logic pins input low level 0 - 0.2 V VDD = 2.7 to 5.5V
ILOGIC EN, SEL logic pins high current -1.0 - 1.0 µA VDD = 2.7 to 5.5V
VGATE External MOSFET gate voltage - 7.0 - V VDD = 2.7 to 5.5V
tGATE-RISE
External MOSFET gate voltage rise
time - 100 200 ns VDD = 2.7 to 5.5V,
CLOAD = 500pF
tGATE-FALL External MOSFET gate voltage fall time - - 20 ns VDD = 2.7 to 5.5V,
CLOAD = 500pF
tVA-FALL
or
tVB-FALL
Output fall time - 180 - µs CEL = 150nF, VCS = 180V,
RSLEW = 100kΩ
RON
On-resistance of internal n-channel
MOSFET at LX pin - - 30 ΩGuaranteed by design.
5
HV816
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
Pin Conguration and External Component Description
Pin # Pin Name Description
1 RSW-Osc
External resistor, RSW, from the RSW-Osc to VDD pins sets the switch converter frequency. The switch
converter frequency is inversely proportional to the external RSW resistor value. Reducing the resistor
value by a factor of two will result in increasing the switch converter frequency by two. A CSW capacitor
is recommended from RSW-Osc to the VDD pin to shunt any switching noise that may couple into the
RSW-Osc pin. A CSW capacitor with a value of 100nF is typically recommended.
2 REL-Osc
External resistor, REL, from the REL-Osc to VDD pins sets the EL frequency. The EL frequency is
inversely proportional to the external REL resistor value. Reducing the resistor value by a factor of two
will result in increasing the EL frequency by two. The SEL pin should be connected to ground if the
REL resistor is used to set the EL frequency. A CFEL capacitor is recommended from the REL-Osc to
VDD pins to shunt any switching noise that may couple into the REL-Osc pin. A CFEL capacitor with a
value of 100nF is typically recommended.
3 SEL
External logic signal input to set the EL frequency. The REL-Osc pin should be connected to ground
to use this pin. The output EL frequency is ¼ of the frequency input at this pin. This pin if not used,
should be connected to ground. Input logic high is 1.5V to VDD. Input logic low is 0 to 0.2V.
4 VREG
Input voltage to set VCS regulation voltage. This pin allows an external voltage source to control the
VCS amplitude. The VCS voltage = (143 ± 5%) x VREG. An external resistor, RREG, connected between
the VREG and VOUT pins controls the VCS charging rate. The charging rate is inversely proportional
to the RREG resistor value.
5 VOUT Switched internal reference voltage.
6 VDD Device low voltage input supply pin.
7 GND Device ground.
8 RSLEW-OUT
An external resistor, RSLEW, from this pin to ground controls the slew rate of VA and VB output dis-
charge. The output discharge slew rate is inversely proportional to the RSLEW resistor value. The VA,
VB output discharge time is given by the equation
tVA-fall or tVB-fall =
(RSLEW x CEL) sec
43.73
9 EN Enable logic pin to turn the device ON/OFF. Input logic high is 1.5V to VDD. Input logic low is 0 to
0.2V.
10 VA
Lamp connections. The polarity is irrelevant. The EL load capacitance is up to 150nF.
11 VB
12 CS High voltage regulated output. Connection for an external high voltage capacitor to ground. A 0.001µF
to 0.015µF 200V capacitor can be used to store the energy transferred from the inductor.
13 HVGND High Voltage Ground. Connect it to device ground
14 VDRIVE Drive voltage for the Gate voltage and also internal regulated voltage for the output drivers. An exter-
nal capacitor (CG) is required at this pin to ground.
15 GATE
Gate control pin for the switching MOSFET. Connection for an external MOSFET. The external
MOSFET is used to boost the low input voltage by inductive yback. When the MOSFET is ON, the
inductor is being charged. When the MOSFET is OFF, the charge stored in the inductor will be trans-
ferred to the high voltage capacitor CS. The energy stored in the capacitor is transferred to the internal
H-bridge, and therefore to the EL lamp. In general, low RON MOSFET’s, which can handle more cur-
rent, are more suitable to drive larger size lamps. Also, a small value inductor should be used. But
as the RON value and the inductor value decrease, the switching frequency of the inductor (controlled
by RSW) should be increased to avoid inductor saturation. The inductor input voltage (VIN) is recom-
mended to be minimum 4.5V to get the 180V output regulation voltage with 150nF EL load.
16 LX Drain of the internal N-channel MOSFET. The internal MOSFET is used to generate the GATE pin
voltage at startup.
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)
©2012 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com
6
HV816
(The package drawing(s) in this data sheet may not reect the most current specications. For the latest package outline
information go to http://www.supertex.com/packaging.html.)
Doc.# DSFP-HV816
B032012
16-Lead QFN Package Outline (K6)
4.00x4.00mm body, 1.00mm height (max), 0.65mm pitch
Symbol A A1 A3 b D D2 E E2 e L L1 θ
Dimension
(mm)
MIN 0.80 0.00
0.20
REF
0.25 3.85* 2.50 3.85* 2.50
0.65
BSC
0.30†0.00 0O
NOM 0.90 0.02 0.30 4.00 2.65 4.00 2.65 0.40†- -
MAX 1.00 0.05 0.35 4.15* 2.80 4.15* 2.80 0.50†0.15 14O
JEDEC Registration MO-220, Variation VGGC-2, Issue K, June 2006.
* This dimension is not specied in the JEDEC drawing.
† This dimension differs from the JEDEC drawing.
Drawings not to scale.
Supertex Doc.#: DSPD-16QFNK64X4P065, Version C041009.
Seating
Plane
Top View
Side View
Bottom View
A
A1
D
E
D2
e
b
E2
A3
L
L1
View B
View B
1
Note 3
Note 2
Note 1
(Index Area
D/2 x E/2)
Note 1
(Index Area
D/2 x E/2)
16
1
16
θ
Notes:
1. A Pin 1 identier must be located in the index area indicated. The Pin 1 identier can be: a molded mark/identier; an embedded metal marker; or
a printed indicator.
2. Depending on the method of manufacturing, a maximum of 0.15mm pullback (L1) may be present.
3. The inner tip of the lead may be either rounded or square.