HV830 Datasheet, PDF (1/4 Pages) Supertex, Inc – High Voltage EL Lamp Driver

HV830
High Voltage EL Lamp Driver
Ordering Information
Device
HV830
Input Voltage
2.0V to 9.5V
Package Options
8-Lead SO
Die
HV830LG
HV830X
Features
❏ Processed with HVCMOS^® technology
❏ 2.0V to 9.5V operating supply voltage
❏ DC to AC conversion
❏ 200V peak-to-peak typical output voltage
❏ Large output load capability – typically 50nF
❏ Permits the use of high-resistance elastomeric lamp
connectors
❏ Adjustable output lamp frequency to control lamp color,
lamp life, and power consumption
❏ Adjustable converter frequency to eliminate harmonics and
optimize power consumption
❏ Enable/disable function
❏ Low current draw under no load condition
❏ Very low standby current – 30nA typical
Applications
❏ Handheld personal computers
❏ Electronic personal organizers
❏ GPS units
❏ Pagers
❏ Cellular phones
❏ Portable instrumentation
Absolute Maximum Ratings*
Supply Voltage, V_DD
-0.5V to +10V
Output Voltage, V_Cs
-0.5V to +120V
Operating Temperature Range
-25°C to +85°C
Storage Temperature Range
-65°C to +150°C
Power Dissipation
400mW
Note:
*All voltages are referenced to GND.
General Description
The Supertex HV830 is a high-voltage driver designed for driving
EL lamps of up to 50nF. EL lamps greater than 50nF can be
driven for applications not requiring high brightness. The input
supply voltage range is from 2.0V to 9.5V. 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 ±100V. The chip can be enabled by connecting the
resistors on R_SW-osc and R_EL-osc to V_DD and disabled when
connected to GND.
The HV830 has two internal oscillators, a switching MOSFET,
and a high-voltage EL lamp driver. The frequency for the switch-
ing converter 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 0.01µF to 0.1µF
capacitor is connected between C_S and GND. The EL lamp is
connected between V_A and V_B.
The switching MOSFET charges the external inductor and
discharges it into the C_s capacitor. The voltage at C_s will start to
increase. Once the voltage at C_s reaches a nominal value of
100V, the switching MOSFET is turned OFF to conserve power.
The outputs V_A and V_B are configured as an H-bridge and are
switched in opposite states to achieve 200V peak-to-peak across
the EL lamp.
Pin Configuration
V_DD
1
R_SW-osc ²
C_s ³
L_x
4
SO-8
8 _REL-osc
7 _VA
6 _VB
5 _GND
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.