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PDF IMP525 Data sheet ( Hoja de datos )

Número de pieza IMP525
Descripción SINGLE CELL BATTERY POWERED ELECTROLUMINESCENT LAMP DRIVER/INVERTER
Fabricantes IMP Inc 
Logotipo IMP  Inc Logotipo



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IMP525
POWER MANAGEMENT
Single Cell Battery Powered
Electroluminescent Lamp
Driver/Inverter
The IMP525 is an Electroluminescent (EL) lamp driver designed for sys-
tems that must operate below 1 volt. The input supply voltage range is
0.9V to 2.5V. Typical output lamp drive voltage is 112V. 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 dri-
ven to high brightness.
The circuit requires few external components; one inductor, one diode,
one capacitor and two resistors. The resistors set the frequency for the
two oscillators.
A disable mode puts the chip into a low current-drain state. When dis-
abled, quiescent current drops to 2µA maximum with a VDD of 1.5V. The
chip can be disabled by connecting RSW, the oscillator frequency setting
resistors, to ground. A disable pad, accessible only on the die, can also be
used to disable the driver.
An internal circuit shuts down the switching regulator when the lamp
drive voltage exceeds 112V peak-to-peak. This conserves power and
extends battery life.
The IMP525 is available in MicroSO and SO-8 packages and in die form.
Block Diagram
Key Features
x Wide operating voltage range - from 0.9V to 2.5V
x Simple design requires few passive components
x 112V peak-to-peak typical AC output voltage
x Adjustable output frequency controls lamp
color and power consumption
x Adjustable converter frequency minimizes
circuit power consumption
x Disable mode extends battery life
x Disable current under 2µA
x Compact MicroSO package option
Applications
x Audio/TV remote control units
x Pagers/Cellular phones
x PDAs
x Clocks and radios
x Portable GPS receivers
x LCD modules
x Toys
VDD 1
RSW-OSC 2
GND 5
Switch
Oscillator
Regulation
Control
IMP525
+
C
VREF
REL-OSC 8
Lamp Drive
Oscillator
Q
Q
Bridge
Output
Driver
Q
Q
4
LX
3
CS
7
VA
6
VB
IMP, Inc.
San Jose, CA
525_01.eps
408-432-9100/www.impweb.com

1 page




IMP525 pdf
Test Circuit
Figure 1 shows the IMP525 configured to drive an EL lamp,
represented as a 3nF capacitor.
ON = VDD
OFF = 0V
REL
IMP525
Application Information
+
VDD
L
D
1N4148
RSW
0.1µF1
CS
0.1µF
100V
1 VDD
REL-OSC 8
2 RSW-OSC
VA 7
3 CS
VB 6
4 LX
GND 5
IMP525
3nF
Note:
1. Larger values may be required depending upon supply impedance.
525_03.eps
Figure 1. Test Circuit
Table 1. VIN = 1.5V
Component
RSW
Connections
VDD, RSW-OSC
REL VDD, REL-OSC
L VDD, LX2
CS CS, GND
D LX, CS
Notes. 2. Murata LQH4N331K04 (8.2max. DCR)
Value
1M
1M
330µH2
0.1µF/100V
1N4148
Description
Boost converter oscillator bias resistor
EL lamp driver oscillator bias resistor
Boost converter inductor
Boost converter storage capacitor
Switching diode
Table 2. VIN = 0.9V
Component
RSW
Connections
VDD, RSW-OSC
REL VDD, REL-OSC
L VDD, LX3
CS CS, GND
D LX, CS
Notes. 3. Coilcraft DS1608C-684 (2.2max. DCR)
Value
1.0M
2.62M
680µH3
0.1µF/100V
1N4148
Description
Boost converter oscillator bias resistor
EL lamp driver oscillator bias resistor
Boost converter inductor
Boost converter storage capacitor
Switching diode
5

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