PDF IMP560 Data sheet ( Hoja de datos )

Número de pieza	IMP560
Descripción	POWER EFFICIENT EL LAMP DRIVER
Fabricantes	IMP Inc
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No Preview Available ! IMP560 POWER MANAGEMENT Power Efficient EL Lamp Driver 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 RSW to ground. The IMP560 is available in MicroSO and SO-8 packages and in die or wafer form. Block Diagram Key Features 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 color and power consumption N Adjustable converter frequency for minimum power consumption N IMP803 pin-compatible N MicroSO package option Applications N Night lights N Automotive displays N Cellular phones N Pagers N Clocks and radios N Portable GPS receivers N LCD module backlights VDD 1 RSW-OSC 2 GND 5 Switch Oscillator Regulation Control IMP560 + C – VREF REL-OSC 8 Q Q Bridge Output Driver and OSC Q Q 4 LX 3 CS 7 VA 6 VB © 2000 IMP, Inc. 408-432-9100/www.impweb.com 560_01.eps 1 1 page IMP560 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. Application Information ON = VDD OFF = 0V 2MΩ 560µH1 L 750kΩ 1 VDD REL-OSC 8 2 RSW-OSC VA 7 + VIN = 3.0V – 1N4148 0.1µF2 0.1µF 100V 3 CS 4 LX VB 6 GND 5 IMP560 Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω) 2. Larger values may be required depending upon supply impedance. Figure 1. 3.0V Application Test and Application Circuit, 5.0V Figure 2 shows a 5.0V input application driving a 6-square-inch EL lamp. ON = VDD OFF = 0V 2MΩ 10nF Equivalent to 3 in2 lamp 560_09.eps + VIN = 5.0V – 560µH1 L 750kΩ 1N4148 0.1µF2 0.1µF 100V 1 VDD REL-OSC 8 2 RSW-OSC VA 7 3 CS VB 6 4 LX GND 5 IMP560 Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω) 2. Larger values may be required depending upon supply impedance. Figure 2. 5.0V Application 6 in2 lamp 560_10.eps © 2000 IMP, Inc. Electroluminescent Lamp Driver 5 5 Page

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Número de pieza	Descripción	Fabricantes
IMP560	POWER EFFICIENT EL LAMP DRIVER	IMP Inc

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