HV826
High Voltage EL Lamp Driver
Ordering Information
Package Options
SO-8
Device
MSOP-8
Die
HV826
HV826MG*
HV826LG
HV826X
* Product supplied on 2500 piece carrier tape reels.
Features
General Description
❏ 1.8V to 3.5V operating supply voltage
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 RSW-OSC to VDD/ground.
❏ DC to AC conversion
❏ Adjustable output frequency
❏ Adjustable switch frequency
❏ Output voltage regulation
❏ Enable/disable function
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 RSW-osc pin and the supply pin VDD. The EL lamp
driver frequency is set by an external resistor connected be-
tween REL-osc pin and the VDD pin. An external inductor is
connected between the LX and VDD pins. A 0.01-0.1µF capacitor
is connected between CS and ground.The EL lamp is connected
between VA and VB.
Applications
❏ Mobile cellular phones
❏ Pagers
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
80V, the switching MOSFET is turned OFF to conserve power.
The outputs VA and VB are configured as an H bridge and are
switching in opposite states to achieve 160V peak-to-peak
across the EL lamp.
❏ Portable Transceivers
❏ Remote Control Units
❏ Calculators
Pin Configuration
Absolute Maximum Ratings*
Supply Voltage, VDD
-0.5V to +4.5V
Output Voltage, VCs
-0.5V to +100V
-25° to +85°C
-65°C to +150°C
250mW
ςΑ
Operating Temperature Range
Storage Temperature Range
MSOP-8 Power Dissipation
SO-8 Power Dissipation
VDD
RSW-osc
REL-osc
Gnd
1
2
3
4
8
7
6
5
VA
VB
CS
LX
MSOP-8
and
SO-8
400mW
Note:
*All voltages are referenced to GND.
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