HV803 Datasheet, PDF (1/8 Pages) Supertex, Inc – High-Voltage EL Lamp Driver

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High-Voltage EL Lamp Driver
HV803
Ordering Information
Device
HV803
Input Voltage
2.4V to 9.5V
Package Options
8-Lead SO
Die
HV803LG
HV803X
Features
Processed with HVCMOS^® technology
2.4V to 9.5V operating supply voltage
DC to AC conversion
180V peak-to-peak typical output voltage
Large output load capability typically 30nF
Short circuit protection on outputs
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
Applications
Pagers
Cellular phones
Electronic personal organizers
GPS units
Handheld personal computers
Portable instrumentation
General Description
The Supertex HV803 is a high-voltage driver designed for driving
EL lamps of up to 30nF. EL lamps greater than 30nF can be
driven for applications not requiring high brightness. The input
supply voltage range is from 2.4 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 ±90V. 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 HV803 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 pins. The EL lamp
is connected between V_A and V_B pins.
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 90V,
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 180V peak-to-peak across
the EL lamp.
15
Pin Configuration
Absolute Maximum Ratings*
ςΑ
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.
15-1
V_DD 1
R_SW-osc 2
C_{s 3}
L_{x 4}
SO-8
8 R_EL-osc
7 V_A
6 ^V_B
5 ^GND