IMP560 IMP Inc, IMP560 Datasheet

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IMP560

Manufacturer Part Number
IMP560
Description
POWER EFFICIENT EL LAMP DRIVER
Manufacturer
IMP Inc
Datasheet

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The IMP560 is an Electroluminescent (EL) lamp driver designed for sys-
tems with low EL lamp drive voltage requirements. It is ideal for low
ambient light applications or where small lamps are used. With just one-
half the inductor current of the IMP803, the IMP560 reduces system
power consumption and extends battery life. Input supply voltage range
is 2.0V to 6.5V and quiescent current is a low 420µA. Typical EL lamp
drive voltage is ±56V.
All four EL lamp-driving functions are on-chip. These are the switch-
mode power supply, its high-frequency oscillator, the high-voltage
H-bridge lamp driver and its low-frequency oscillator. EL lamps of up to
6nF capacitance can be driven to high brightness.
The circuit requires few external components; a single inductor, a single
diode, two capacitors and three resistors. Two of these resistors set the
frequencies for two internal oscillators. An internal circuit shuts down
the switching regulator when the lamp drive voltage exceeds 120V
peak-to-peak. This conserves power and extends battery life.
A disable mode puts the chip into a low current drain mode. With a 3.0V
supply, quiescent current drops to 200nA maximum, 50nA typical. The
chip is disabled by connecting the oscillator frequency setting resistor
R
The IMP560 is available in MicroSO and SO-8 packages and in die or
wafer form.
© 2000 IMP, Inc.
R
R
SW
SW-OSC
Block Diagram
EL-OSC
GND
V
to ground.
DD
1
2
5
8
IMP560
Oscillator
Switch
Regulation
Control
C
+
V
REF
408-432-9100/www.impweb.com
Bridge Output
Driver and
OSC
N 112V peak-to-peak typical AC output voltage
N Low input current (w/inductor current)......12mA
N Low disabled input current......50nA
N Wide operating voltage range - from 2.0V to 6.5V
N Simple design requires few passive components
N Adjustable output lamp frequency controls lamp
N Adjustable converter frequency for minimum
N IMP803 pin-compatible
N MicroSO package option
N Night lights
N Automotive displays
N Cellular phones
N Pagers
N Clocks and radios
N Portable GPS receivers
N LCD module backlights
color and power consumption
power consumption
Q
Q
Q
Q
4
3
7
6
IMP560
IMP560
560_01.eps
L
C
V
V
A
X
B
S
Key Features
Applications
1

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IMP560 Summary of contents

Page 1

... A disable mode puts the chip into a low current drain mode. With a 3.0V supply, quiescent current drops to 200nA maximum, 50nA typical. The chip is disabled by connecting the oscillator frequency setting resistor R to ground. SW The IMP560 is available in MicroSO and SO-8 packages and in die or wafer form. Block Diagram ...

Page 2

... SW-OSC Ordering Information IMP560EMA 2.0V to 6.5V IMP560ESA 2.0V to 6.5V IMP560/D* 2.0V to 6.5V IMP560/D1** 2.0V to 6.5V * Disable pad not active ** Disable pad active Absolute Maximum Ratings Supply Voltage and V DD RSW-OSC REL-OSC Output Voltage –0.5V to +120V CS Operating Temperature Range . . . . . . . . . . . . . –40°C to +85°C Storage Temperature Range –65°C to +150°C Power Dissipation (SO) ...

Page 3

vs 100 L = 100µ 2.0 3.0 4 100 L = 470µ 2.0 3.0 ...

Page 4

... The IMP560 generates high voltages and caution should be exercised. 4 Positive voltage supply for the IMP560. Inductor L may be connected here separate unregulated supply. Switch-mode resistor pin. Switching frequency is determined by an external resistor, R Boost converter storage capacitor. The voltage across the EL lamp is equal to twice the voltage at C ...

Page 5

... Test and Application Circuit, 3.0V Figure 1 shows the IMP560 configured to drive a 3-square-inch EL lamp, represented as a 10nF capacitor OFF = 0V 1 560µ 3.0V IN – 2 0.1µF Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω Larger values may be required depending upon supply impedance. Test and Application Circuit, 5.0V Figure 2 shows a 5 ...

Page 6

... Enable/Disable Operation Figure 3 shows the IMP560 can be enabled via a logic gate that con- nects and disabled by connecting it to ground connected either the gate OFF = – 0.1µF ...

Page 7

0.10mm e 0.004in A1 b © 2000 IMP, Inc. 0°– 8° ...

Page 8

IMP, Inc. Corporate Headquarters 2830 N. First Street San Jose, CA 95134-2071 Tel: 408-432-9100 Fax: 408-434-0335 e-mail: info@impinc.com http://www.impweb.com The IMP logo is a registered trademark of IMP, ...

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