HV825 Datasheet, PDF (1/4 Pages) Supertex, Inc – High Voltage EL Lamp Driver

HV825
High Voltage EL Lamp Driver
Ordering Information
Device
Input Voltage
8-Lead SO
HV825
1.0 to 1.6V
HV825LG
* Product supplied on 2500 piece carrier tape reels.
Package Options
MSOP-8
HV825MG*
Die
HV825X
Features
❏ Processed with HVCMOS^® technology
❏ 1.0V to 1.6V operating supply voltage
❏ DC to AC conversion
❏ Output load of typically up to 6nF
❏ Adjustable output lamp frequency
❏ Adjustable converter frequency
❏ Enable function
Applications
❏ Pagers
❏ Portable Transceiver
❏ Cellular phones
❏ Remote control units
❏ Calculators
Absolute Maximum Ratings*
Supply voltage, V_DD
Operating Temperature Range
-0.5V to +2.5V
-25°C to +85°C
Storage Temperature Range
-65°C to +150°C
MSOP-8 Power Dissipation
SO-8 Power Dissipation
300mW
400mW
Note:
*All voltages are referenced to GND.
For detailed circuit and application information, please refer
to application notes AN-H33 and AN-H34.
General Description
The Supertex HV825 is a high voltage driver designed for driving
EL lamps typically up to 6nF. The input supply voltage range is
from 1.0V to 1.6V. The device uses a single inductor and a
minimum number of passive components. Typical output
voltage that can be applied to the EL lamp is ±56V.
The HV825 can be enabled/disabled by connecting the R_SW-osc
resistor to V_DD/ground.
The HV825 has two internal oscillators, a switching bipolar
junction transistor (BJT), and a high voltage EL lamp driver. The
frequency for the switching BJT 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
between 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 to 0.1µF, 100V
capacitor is connected between C_S and ground. The EL lamp is
connected between V_A and V_B.
The switching BJT charges the external inductor and discharges
it into the 0.01 to 0.1µF, 100V capacitor at C_S. The voltage at C_S
will start to increase. The outputs V_A and V_B are configured as
an H-bridge and are switching in opposite states to achieve a
peak-to-peak voltage of two times the V_CS voltage across the EL
lamp.
Pin Configuration
V_DD 1
R_SW-osc 2
C_s 3
L_x 4
8 R_EL-osc
7 V_A
6 V_B
5 GND
top view
SO-8/MSOP-8
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.