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PDF IMP527 Data sheet ( Hoja de datos )
| Número de pieza | IMP527 | |
| Descripción | SINGLE CELL BATTERY POWERED ELECTROLUMINESCENT LAMP DRIVER/INVERTER | |
| Fabricantes | IMP Inc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de IMP527 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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IMP527
POWER MANAGEMENT
Single Cell Battery Powered
Electroluminescent Lamp
Driver/Inverter
The IMP527 is an Electroluminescent (EL) lamp driver designed for
systems that must operate down to 1 volt and below. The input supply
voltage range is 0.9V to 2.5V. Typical output lamp drive voltage is 180V.
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; 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 1µA typical with a VDD of 1.5V. The chip
can be disabled by connecting RSW, the oscillator frequency setting resis-
tor, to ground. A disable pad (active low), 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 180V peak-to-peak. This conserves power and
extends battery life.
The IMP527 is available in MicroSO and SO-8 packages and in die form.
Block Diagram
Key Features
N Wide operating voltage range - from 0.9V to 2.5V
N Simple design requires few passive components
N 180V peak-to-peak typical AC output voltage
N Adjustable output frequency controls lamp
color and power consumption
N Adjustable converter frequency minimizes
circuit power consumption
N Disable mode extends battery life
N Disable current 1µA typical
N Compact MicroSO package option
Applications
N Audio/TV remote control units
N Pagers/Cellular phones
N PDAs
N Clocks and radios
N Portable GPS receivers
N LCD modules
N Toys
VDD 1
2
RSW-OSC
GND 5
Switch
Oscillator
Regulation
Control
IMP527
+
C
–
VREF
REL-OSC 8
Lamp Drive
Oscillator
Q
Q
Bridge
Output
Driver
Q
Q
4
LX
3
CS
7
VA
6
VB
© 2000 IMP, Inc.
408-432-9100/www.impweb.com
527_01.eps
1
1 page  
IMP527
Test Circuit
Figure 1 shows the IMP527 configured to drive an EL lamp,
represented as a 3nF capacitor.
ON = VDD
OFF = 0V
Application Information
REL
+
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
CSW*
0.1nF
IMP527
3nF
Note:
1. Larger values may be required depending upon supply impedance.
* Optional
Figure 1. Test Circuit
Table 1. VIN = 1.5V
Component
Connections
RSW
VDD, RSW-OSC
REL
VDD, REL-OSC
L VDD, LX2
CS CS, GND
D LX, CS
CSW
RSW-OSC, GND
Notes. 2. Murata LQH4N331K04 (8.2Ω max. DCR)
Value
1MΩ
1MΩ
330µH2
0.1µF/100V
1N4148
0.1nF
527_03.eps
Description
Boost converter oscillator bias resistor
EL lamp driver oscillator bias resistor
Boost converter inductor
Boost converter storage capacitor
Switching diode
Noise-suppression capacitor (optional)
Table 2. VIN = 0.9V
Component
RSW
REL
L
CS
D
CSW
Connections
VDD, RSW-OSC
VDD, REL-OSC
VDD, LX3
CS, GND
LX, CS
RSW-OSC, GND
Notes. 3. Coilcraft DS1608C-684 (2.2Ω max. DCR)
© 2000 IMP, Inc.
Value
1MΩ
2.62MΩ
680µH3
0.1µF/100V
1N4148
0.1nF
Description
Boost converter oscillator bias resistor
EL lamp driver oscillator bias resistor
Boost converter inductor
Boost converter storage capacitor
Switching diode
Noise-suppression capacitor (optional)
Electroluminescent Lamp Driver
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet IMP527.PDF ] | |
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