IMP528 IMP Inc, IMP528 Datasheet
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IMP528
Manufacturer Part Number
IMP528
Description
HIGH-VOLTAGE EL LAMP DRIVER
Manufacturer
IMP Inc
Datasheet
1.IMP528.pdf
(6 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
IMP528EMA
Manufacturer:
PHILIPS
Quantity:
3 360
Part Number:
IMP528ESA
Manufacturer:
IMP
Quantity:
20 000
Part Number:
IMP528ESA-T
Manufacturer:
IMP
Quantity:
20 000
The IMP528 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 IMP528 drives EL lamps of up to
50nF capacitance to high brightness; EL lamps with capacitances greater
than 50nF can be driven, but will be lower in light output. The typical
regulated output voltage that is applied to the EL lamp is 220V peak-to-
peak. The circuit requires few external components; a single inductor,
single diode, two capacitors and two resistors. Two of these resistors
set the frequency for two internal oscillators.
Unlike other EL lamp drivers, the IMP528 does not require an external
protection resistor in series with the EL lamp.
The IMP528 operates over a 2.0V to 6.5V supply voltage range. A
regulated, low-power source can supply the low quiescent current of the
IMP528. 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 220V peak-to-peak. This conserves power and
extends battery life.
The IMP528 is available in MicroSO and SO-8 packages and in die or
wafer form.
© 2001 IMP, Inc.
R
R
SW-OSC
Block Diagram
EL-OSC
GND
V
DD
1
2
5
8
IMP528
Oscillator
Switch
Regulation
Control
Lamp Drive
Oscillator
C
+
–
V
REF
408-432-9100/www.impweb.com
Bridge
Output
Driver
N 220V peak-to-peak typical AC output voltage
N Low Power: 420µA typical V
N Wide operating voltage range - from 2.0V to 6.5V
N Large output load capability - drives lamps
N Eliminates external protection resistor in series
N Adjustable output lamp frequency for control of
N Adjustable converter frequency to minimize
N High-Voltage CMOS Process
N MicroSO package option
N GPS units/Pagers/Cellular phones
N PDAs/Handheld computers
N Safety illumination
N Portable instrumentation
N Battery-operated displays
N LCD modules
N Toys
with more than 50nF capacitance
with EL lamp
lamp color, lamp life, and power consumption
power consumption
Q
Q
Q
Q
4
3
7
6
528_01.eps
IMP528
IMP528
L
C
V
V
A
X
B
S
Key Features
Applications
DD
current
1