HV826
High Voltage EL Lamp Driver
Ordering Information
Package Options
Device
HV826
MSOP-8
HV826MG*
SO-8
HV826LG
Die
HV826X
* Product supplied on 2500 piece carrier tape reels.
Features
❏
1.8V to 3.5V operating supply voltage
❏
DC to AC conversion
❏
Adjustable output frequency
❏
Adjustable switch frequency
❏
Output voltage regulation
❏
Enable/disable function
General Description
The Supertex HV826 is a high voltage driver designed for driving
EL lamps. The input supply voltage range is from 1.8V to 3.5V.
The device uses a single inductor and a minimum number of
passive components. The nominal regulated output voltage that
is applied to the EL lamp is
±80V.
The chip can be enabled/
disabled by connecting the resistor on R
SW-OSC
to V
DD
/ground.
The HV826 has two internal oscillators, a switching MOSFET,
and a high voltage EL lamp driver. The frequency for the
switching MOSFET is set by an external resistor connected
between the R
SW-osc
pin and the supply pin V
DD
. The EL lamp
driver frequency is set by an external resistor connected be-
tween R
EL-osc
pin and the V
DD
pin. An external inductor is
connected between the L
X
and V
DD
pins. A 0.01-0.1µF capacitor
is connected between C
S
and ground. The EL lamp is connected
between V
A
and V
B
.
The switching MOSFET charges the external inductor and
discharges it into the capacitor at C
S
. The voltage at C
S
will start
to increase. Once the voltage at C
S
reaches a nominal value of
80V, the switching MOSFET is turned OFF to conserve power.
The outputs V
A
and V
B
are configured as an H bridge and are
switching in opposite states to achieve 160V peak-to-peak
across the EL lamp.
Applications
❏
Mobile cellular phones
❏
Pagers
❏
Portable Transceivers
❏
Remote Control Units
❏
Calculators
Absolute Maximum Ratings*
Supply Voltage, V
DD
Output Voltage, V
Cs
Operating Temperature Range
Storage Temperature Range
MSOP-8 Power Dissipation
SO-8 Power Dissipation
Note:
*All voltages are referenced to GND.
Pin Configuration
ςΑ
V
DD
R
SW-osc
R
EL-osc
Gnd
1
2
3
4
8
-0.5V to +4.5V
-0.5V to +100V
-25° to +85°C
-65°C to +150°C
250mW
400mW
V
A
V
B
C
S
L
X
MSOP-8
and
SO-8
7
6
5
Top View
11/12/01
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability
indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to
workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the
Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
1
HV826
Electrical Characteristics
DC Characteristics
(Over recommended operating conditions unless otherwise specified, T
A
=25°C)
Symbol
R
DS(on)
V
Cs
V
A-B
I
DDQ
I
DD
I
IN
V
CS
f
EL
f
SW
D
Parameter
On-resistance of switching transistor
Max. output regulation voltage
Max. of differential output voltage
across lamp
Quiescent V
DD
supply current
Input current going into the V
DD
pin
Input current including inductor current
Output voltage on V
CS
V
A-B
output drive frequency
Switching transistor frequency
Switching transistor duty cycle
65
300
35
70
375
80
88
450
75
150
80
160
Min
Typ
Max
7.0
85
170
100
150
45
Units
Ω
V
V
nA
µA
mA
V
Hz
KHz
%
I=100mA
V
DD
=1.8V to 3.5V
V
DD
=1.8V to 3.5V
R
SW-osc
= Low
V
DD
=1.8V to 3.5V. See Figure 1.
V
IN
=1.5V. See Figure 1.
V
IN
=1.5V. See Figure 1.
V
IN
=1.5V. See Figure 1.
V
IN
=1.5V. See Figure 1.
See figure 1.
Conditions
Recommended Operating Conditions
Symbol
V
DD
f
EL
T
A
Supply voltage
V
A-B
output drive frequency
Operating temperature
Parameter
Min
1.8
60
-25
Typ
Max
3.5
1000
85
Units
V
KHz
°C
Conditions
Enable/Disable Function Table
Symbol
EN-L
EN-H
Parameter
Logic input low voltage
Logic input high voltage
Min
0
V
DD
-0.5
Typ
Max
0.5
V
DD
Units
V
V
Conditions
V
DD
=1.8V to 3.5V
V
DD
=1.8V to 3.5V
2
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