HV826 Datasheet, PDF (1/6 Pages) Supertex, Inc – High Voltage EL Lamp Driver

HV826
High Voltage EL Lamp Driver
Ordering Information
Package Options
Device
MSOP-8
SO-8
HV826
HV826MG*
HV826LG
* 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
Applications
❏ Mobile cellular phones
❏ Pagers
❏ Portable Transceivers
❏ Remote Control Units
❏ Calculators
Die
HV826X
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.
Absolute Maximum Ratings*
Supply Voltage, V_DD
-0.5V to +4.5V
Output Voltage, V_Cs
-0.5V to +100V
Operating Temperature Range
-25° to +85°C
Storage Temperature Range
-65°C to +150°C
MSOP-8 Power Dissipation
250mW
SO-8 Power Dissipation
400mW
Note:
*All voltages are referenced to GND.
Pin Configuration
ςΑ
V_DD 1
8 V_A
R_SW-osc 2
R_EL-osc 3
Gnd 4
MSOP-8
and
SO-8
7 V_B
6 C_S
5 L_X
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 prod₁ucts, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.