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| HV833_07 Datasheet, PDF (1/10 Pages) Supertex, Inc – High Voltage EL Lamp Driver | |||
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HV833
High Voltage EL Lamp Driver
Features
⺠1.8V to 6.5V operating supply voltage
⺠DC to AC conversion
⺠Separately adjustable lamp and converter
frequency
⺠Output voltage regulation
⺠Enable/disable function
⺠Patented output timing for high efï¬ciency
⺠<100nA shutdown current
⺠Split supply capability
⺠LCD backlighting
Applications
⺠Portable Transceivers
⺠Remote Control Units
⺠Calculators
⺠PDAs
⺠Global Positioning Systems (GPS)
General Description
The Supertex HV833 is a high voltage driver designed for driving EL
lamps of up to 35nF (10-12in2). The input supply voltage range is
from 1.8V to 6.5V. 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/
disabled by connecting a resistor between the RSW-Osc pin and the
VDD/GND pins.
The HV833 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 VDD supply pin. The EL lamp driver frequency is set by an external
resistor connected between the REL-Osc pin and the VDD pin. An external
inductor is connected between the LX pin and VDD or VIN pin. A 0.003-
0.1µF capacitor is connected between the CS pin and the GND pin.
The EL lamp is connected between the VA pin and the VB pin.
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 90V, the switching
MOSFET is turned OFF to conserve power. The outputs VA and VB
are conï¬gured as an H bridge and are switching in opposite states to
achieve 180V peak-to-peak across the EL lamp.
Typical Application Circuit
ON = VDD
OFF = 0
VDD
+
VIN_
Enable Signal
1 VDD
2 RSW-Osc
VA 8
VB 7
3 REL-Osc
4 GND
CS 6
LX 5
HV833MG
EL Lamp
1N914
LX
CS
100V
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