Supertex inc.
Features
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HV861
Dimmable, Low Noise, Dual EL Lamp Driver
the regulated output voltage is at a nominal value of 90V.
The EL Lamps will therefore see ±90V. The two EL Lamps
can be turned ON and OFF using two CMOS logic inputs,
EN1 and EN2. The driver is disabled when both EN1 and
EN2 are at logic low.
Adjustable output regulation for dimming
Lamp fade-in/fade-out capability
Low audible noise
180VPP output voltage for higher brightness
1.5V enable input logic high
Single cell lithium ion compatible
One miniature inductor to power both lamps
Separately adjustable lamp and converter frequencies
Split supply capability
16-Lead QFN package
The HV861 has two internal oscillators, a switching MOSFET,
and two high voltage EL Lamp driver H-bridges. Each driver
has its own half bridge common output, COM1 and COM2,
which significantly minimizes the DC offset seen by the EL
Lamp. The frequency for the switching MOSFET is set by an
external resistor connected between the RSW-Osc pin and
the supply pin VDD. The EL Lamp driver frequency is set
by an external resistor connected between the REL-Osc pin
and the VDD pin. An external inductor is connected between
the LX and VDD pins or VIN for split supply applications.
Depending upon the EL Lamp sizes, a 1.0nF to 10.0nF
capacitor is connected between the CS and ground.
Applications
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Dual display cellular phones
Keypad and LCD backlighting
PDAs
Handheld wireless communication products
Global Positioning Systems (GPS)
General Description
As the switching MOSFET charges the external inductor
and discharges it into the capacitor at CS, the voltage at
CS will start to increase. Once the voltage at CS reaches a
nominal value of 90V, the switching MOSFET is turned OFF
to conserve power.
The Supertex HV861 is a low noise, dimmable, high
voltage, dual EL Lamp driver designed for driving two
electroluminescent (EL) Lamps with a combined area of 5.0
square inches. The input supply voltage range is from 2.5V
to 4.5V. Enable input logic high can go as low as 1.5V, which
allows logic interface operating from typical 1.8V supplies.
The device is designed to minimize audible noise emitted by
the EL Lamps.
EL Lamp dimming can be accomplished by applying a PWM
logic signal to the PWM pin. The EL Lamp brightness will be
inversely proportional to the PWM duty cycle. The HV861
The device uses a single inductor and a minimum number of can also slowly turn the EL Lamp ON/OFF giving a fade ON/
passive components. Using the internal reference voltage, OFF appearance.
Typical Application Circuit
VIN = 3.2 to 4.2V
100µH Coilcraft
LPS4012
3.3MΩ
4.7µF
VDD = 3.0V
0.1µF
3
2.0MΩ 1
2
Input Logic Control:
ON = 1.5 to VDD
OFF = 0 to 0.2V
825kΩ
4
5
15
14
VREG
VOUT
VDD
7
CS
EL1
HV861K7-G
COM1
RSW-Osc
EL2
EN1
COM2
EN2
VREF
16
PWM
13
3.3nF
100V NPO
8
LX
REL-Osc
2.2µF
Supertex inc.
1N4148
12
11
EL1
9
10
EL2
GND
6
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
HV861
Pin Configuration
Ordering Information
VREF VREG
16-Lead QFN
Device
3.00x3.00mm body
0.80mm height (max)
0.50mm pitch
HV861
HV861K7-G
16
-G indicates package is RoHS compliant (‘Green’)
15
VOUT PWM
14
13
REL-Osc
1
12
EL1
RSW-Osc
2
11
COM1
VDD
3
10
COM2
EN1
4
9
5
6
7
EN2 GND LX
EL2
8
CS
16-Lead QFN Package
Absolute Maximum Ratings
Parameter
Note:
Pads are at the bottom of the package. Center heat slug is at ground
potential.
Value
VDD, supply voltage
-0.5V to 5.5V
Operating temperature
Product Marking
-40°C to +85°C
Storage temperature
-65°C to +150°C
Power dissipation
VCS, output voltage
Y = Last Digit of Year Sealed
W = Code for Week Sealed
L = Lot Number
= “Green” Packaging
H861
YWLL
1.6W
-0.5V to +120V
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.
Package may or may not include the following marks: Si or
16-Lead QFN Package
Thermal Resistance
Package
θja
16-Lead QFN
60 °C/W
Recommended Operating Conditions
Sym
Parameter
Min
Typ
Max
Units
VDD
Supply voltage
2.5
-
4.5
V
---
fSW
Switching frequency
40
-
200
kHz
---
fEL
EL output frequency
100
-
500
Hz
---
0
-
20
nF
---
-40
-
+85
°C
---
CLOAD
TA
Total EL Lamp capacitance load
Operating temperature
Conditions
Electrical Characteristics (Over recommended operating conditions unless otherwise specified)
Sym
Parameter
Min
Typ
Max
Units
Conditions
RDS(ON)
On-resistance of switching transistor
-
-
7.0
Ω
I = 100mA
VCS
Maximum output regulation voltage
80
90
100
V
VDD = 2.5V to 4.5V
-
78
-
-
62
-
-
45
-
0
-
1.40
VCS
VREG
Output regulation voltage
External input voltage range
Supertex inc.
VDD = 2.5V to 4.5V, VREG = 1.092V
V
VDD = 2.5V to 4.5V, VREG = 0.862V
VDD = 2.5V to 4.5V, VREG = 0.632V
V
VDD = 2.5V to 4.5V
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
2
HV861
Electrical Characteristics (cont.)
Sym
Parameter
Min
Typ
Max
Units
VREFH
VREF output high voltage
1.12
1.26
1.40
V
VDD = 2.5V to 4.5V
Average sourcing current from VREF pin
-
6.0
-
µA
VDD = 2.5V to 4.5V
Average sinking current from VREF pin
-
6.0
-
µA
VDD = 2.5V to 4.5V
-
-
300
-
-
400
nA
-
-
500
VDD = 2.5V,
EN1 = EN2 = PWM = low
VDD = 3.0V,
EN1 = EN2 = PWM = low
VDD = 4.5V,
EN1 = EN2 = PWM = low
IREF(SOURCE)
IREF(SINK)
IDDQ
Quiescent VDD supply current
Conditions
IDD
Input current going into the VDD pin
-
-
250
µA
VDD = 2.5V to 4.5V, REL = 2.0MΩ,
RSW = 825kΩ
IIN
Input current including inductor current
-
25
50
mA
VIN = 3.2V (see Test Circuit)
fEL
EL Lamp frequency
160
190
220
Hz
REL = 2.0MΩ
fSW
Switching transistor frequency
84
100
116
kHz
RSW = 825kΩ
Input PWM frequency
10
-
100
kHz
---
-
88
-
%
---
PWM
D
Switching transistor duty cycle
VIH
Enable PWM input logic high voltage
1.5
-
VDD
V
VDD = 2.5V to 4.5V
VIL
Enable PWM input logic low voltage
0
-
0.2
V
VDD = 2.5V to 4.5V
IIH
Enable PWM input logic high current
-
-
1.0
µA
VIH = VDD = 2.5V to 4.5V
IIL
Enable PWM input logic low current
-
-
-1.0
µA
VIL = 0V, VDD = 2.5V to 4.5V
CIN
Enable PWM input capacitance
-
-
15
pF
---
Function Table
EN1
EN2
EL1
EL2
COM1
COM2
IC
0
0
Hi Z
Hi Z
Hi Z
Hi Z
OFF
0
1
Hi Z
ON
Hi Z
ON
ON
1
0
ON
Hi Z
ON
Hi Z
ON
1
1
ON
ON
ON
ON
ON
Typical Performance (EL1 lamp size = EL2 lamp size = 3.6in2)
VDD
(V)
3.0
VIN
Lamp
(V)
IIN
(mA)
EL1 ON
16.5
EL2 ON
16.5
EL1 and EL2 ON
29.8
4.0
Supertex inc.
VCS
(VPEAK)
93
fEL
(Hz)
188
Lamp Brightness
(cd/m2)
EL1
EL2
14.0
-
-
14.0
14.0
14.0
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3
HV861
Figure 1: Block Diagram
EN1
EL1 Enable
EN2
EL2 Enable
RSW-Osc
CS
LX
VDD
EL1
PWM Switch
Oscillator
0 to 88%
C
+
-
VCS
COM1
Output
Drivers
VSENSE
VCS
1.26V
VREF
VREG
60pF
EL2
VOUT
VCS
GND
COM2
2 x EL Freq.
1 x EL Freq.
REL-Osc
PWM VREF
Figure 2: Test Circuit
VIN
IIN
4.7µF
100µH Coilcraft
LPS4012
1N4148
3.3MΩ
VDD
IDD
3
0.1µF
Input Logic Control:
ON = 1.5V to VDD
OFF = 0V to 0.2V
2.0MΩ 1
2
825kΩ
4
5
15
14
7
VREG VOUT LX
Supertex inc.
HV861K7
VDD
REL-Osc
EL1
COM1
RSW-Osc
EL2
EN1
COM2
EN2
2.2µF
8
CS
VREF
PWM
GND
16
13
6
3.3nF
100V NPO
12
11
620Ω
12nF
620Ω
12nF
9
10
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
4
HV861
Figure 3: Typical Waveform EL1, COM1 and Differential Waveform EL1 – COM1
EL1
COM1
EL1 - COM1
Split Supply Configuration
Enable/Disable Configuration
The HV861 can also be used for handheld devices operating
from a battery where a regulated voltage is available. This
is shown in Figure 4. The regulated voltage can be used to
run the internal logic of the HV861. The amount of current
necessary to run the internal logic is 250µA max. Therefore,
the regulated voltage could easily provide the current without being loaded down.
EL1 and EL2 outputs can be enabled and disabled via a
logic control signal on the EN1 and EN2 pins respectively.
When EN1 is high/low, the Lamp1 (EL1) will be ON/OFF.
When EN2 is high/low, the Lamp2 (EL2) will be ON/OFF.
The control signal can be from a microprocessor.
Figure 4: Split Supply and Enable/Disable Configuration
Battery Voltage = VIN
+
_
LX
CIN
D
RREG
15
14
VREG VOUT
3
Regulated Voltage = VDD
+
_ CDD
REL 1
2
RSW
Input Logic Control:
Input Logic Control:
4
5
VDD
LX
HV861
REL-Osc
EN2
VREF
16
CS
EL1
EL2
EN1
COM2
PWM
13
CS
8
COM1
RSW-Osc
CREF
Supertex inc.
7
12
11
EL1
9
10
EL2
GND
6
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
5
HV861
Pin Configuration and External Component Description
Pin #
Name
Description
REL-Osc
External resistor from REL-Osc to VDD 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.
fEL = (2.0MΩ • 190Hz) / REL
2
RSW-Osc
External resistor from RSW-Osc to VDD 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.
fSW = (825kΩ • 100kHz) / RSW
3
VDD
Low voltage input supply pin.
4
EN1
Enable input signal for EL Lamp 1. CMOS logic input pin. Refer to the function table.
5
EN2
Enable input signal for EL Lamp 2. CMOS logic input pin. Refer to the function table.
6
GND
Device ground.
1
7
LX
Drain of internal switching MOSFET. Connection for an external inductor.
The inductor LX is used to boost the low input voltage by inductive flyback. When the internal switch
is on, the inductor is being charged. When the internal switch is off, the charge stored in the inductor
will be transferred to the high voltage capacitor CS. The energy stored in the capacitor is connected
to the internal H-bridge, and therefore to the EL Lamp. In general, smaller value inductors, which can
handle more current, are more suitable to drive larger size Lamps. As the inductor value decreases,
the switching frequency of the inductor (controlled by RSW) should be increased to avoid saturation.
8
CS
Connect a 100V capacitor between this pin and ground. This capacitor stores the energy transferred
from the inductor.
9
EL2
EL Lamp 2 connection.
10
COM2
Common connection for EL2 Lamp.
11
COM1
Common connection for EL1 Lamp.
12
EL1
13
PWM
PWM pulse input for EL Lamp dimming. The duty cycle of the PWM signal is inversely proportional
to the output voltage. If PWM dimming is not desired, then the PWM pin should be tied to ground.
14
VOUT
Switched internal reference voltage.
VREG
Input voltage to set VCS regulation voltage. This pin allows an external voltage source to control the
VCS amplitude. EL Lamp dimming can be accomplished by varying the input voltage to VREG. The
VCS voltage is approximately 71 times the voltage seen on VREG.
15
EL Lamp 1 connection.
External resistor connected between VREG and VOUT pins controls the VCS charging rate. The
charging rate is inversely proportional to the resistor value.
16
VREF
Internal reference voltage to set the regulation voltage. Connect an external capacitor (CREF) from
VREF to ground to slowly brighten the lamp during power-up and dim down the lamp during powerdown. The size of the capacitor determines the time taken to brighten up or dim down. If fade-in
and fade-out are not required, this pin should be left floating. Fade in/fade out time = CREF x 210 x
103sec.
Supertex inc.
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
6
HV861
16-Lead QFN Package Outline (K7)
3.00x3.00mm body, 0.80mm height (max), 0.50mm pitch
D2
D
16
Note 1
(Index Area
D/2 x E/2)
16
1
1
e
Note 1
(Index Area
D/2 x E/2)
E
E2
b
View B
Top View
Bottom View
Note 3
θ
L
A
A3
A1
Seating
Plane
L1
Note 2
Side View
View B
Notes:
1. 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.
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.
Symbol
Dimension
(mm)
A
A1
MIN
0.70
0.00
NOM
0.75
0.02
MAX
0.80
0.05
A3
0.20
REF
b
D
D2
E
E2
e
0.18
2.85*
1.50
2.85*
1.50
0.25
3.00
1.65
3.00
1.65
0.30
3.15*
1.80
3.15*
1.80
0.50
BSC
L
L1
θ
0.20†
0.00
0O
0.30†
-
-
0.45
0.15
14O
JEDEC Registration MO-220, Variation WEED-4, Issue K, June 2006.
* This dimension is not specified in the JEDEC drawing.
† This dimension differs from the JEDEC drawing.
Drawings not to scale.
Supertex Doc. #: DSPD-16QFNK73X3P050, Version C041009.
(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.)
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)
Supertex inc.
©2010 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited.
Doc.# DSFP-HV861
B032310
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com
7
