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- UID
- 905693
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2000 IMP, Inc. 408-432-9100/www.impweb.com 1
IMP803
POWER MANAGEMENT
High-Voltage EL Lamp Driver
a78 GPS units/Pagers/Cellular phones
a78 PDAs/Handheld computers
a78 Safety illumination
a78 Portable instrumentation
a78 Battery-operated displays
a78 LCD modules
a78 Toys
a78 Low Power: 420A typical V
DD
current
a78 Wide operating voltage range - from 2.0V to 6.5V
a78 180V peak-to-peak typical AC output voltage
a78 Large output load capability - drive lamps
with more than 30nF capacitance
a78 Adjustable output lamp frequency for control of
lamp color, lamp life, and power consumption
a78 Adjustable converter frequency to minimize
power consumption
a78 Device can be Enabled/Disabled
a78 Low quiescent current – 20nA (disabled)
a78 High-Voltage CMOS Process
a78 MicroSO package option
The IMP803 is an Electroluminescent (EL) lamp driver with the four EL
lamp driving functions on-chip. These are the switch-mode power sup-
ply, its high-frequency oscillator, the high-voltage H-bridge lamp driver
and its low-frequency oscillator. The IMP803 drives EL lamps of up to
30nF capacitance to high brightness; EL lamps with capacitances greater
than 30nF can be driven, but will be lower in light output. The typical
regulated output voltage that is applied to the EL lamp is 180V peak-to-
peak. The circuit requires few external components, a single inductor,
single diode, two capacitors and three resistors. Two of these resistors
set the frequency for two internal oscillators.
The IMP803 operates over a 2.0V to 6.5V supply voltage range. A
regulated, low-power source can supply the low quiescent current of the
IMP803. The inductor may be driven from an independent, unregulated
supply voltage in dual supply applications.
An internal circuit shuts down the switching regulator when the lamp
drive voltage reaches 180V peak-to-peak. This conserves power and
extends battery life.
The IMP803 is available in MicroSO and SO-8 packages and in die or
wafer form. |
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