imp803

Manufacturer Part Numberimp803
DescriptionHigh-voltage Lamp Driver
ManufacturerETC-unknow
imp803 datasheet
 


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The IMP803 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 IMP803 drives EL lamps of up to
30nF capacitance to high brightness; EL lamps with capacitances greater
than 30nF can be driven, but will be lower in light output. The typical
regulated output voltage that is applied to the EL lamp is 180V peak-to-
peak. The circuit requires few external components, a single inductor,
single diode, two capacitors and three resistors. Two of these resistors
set the frequency for two internal oscillators.
The IMP803 operates over a 2.0V to 6.5V supply voltage range. A
regulated, low-power source can supply the low quiescent current of the
IMP803. 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 180V peak-to-peak. This conserves power and
extends battery life.
The IMP803 is available in MicroSO and SO-8 packages and in die or
wafer form.
Block Diagram
1
V
DD
2
Switch
R
SW-OSC
Oscillator
5
GND
C
Regulation
Control
IMP803
8
Lamp Drive
R
EL-OSC
Oscillator
© 2000 IMP, Inc.
N Low Power: 420µA typical V
N Wide operating voltage range - from 2.0V to 6.5V
N 180V peak-to-peak typical AC output voltage
N Large output load capability - drive lamps
N Adjustable output lamp frequency for control of
N Adjustable converter frequency to minimize
N Device can be Enabled/Disabled
N Low quiescent current – 20nA (disabled)
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
Q
+
V
REF
Q
Bridge
Output
Driver
Q
Q
408-432-9100/www.impweb.com
IMP803
IMP803
Key Features
current
DD
with more than 30nF capacitance
lamp color, lamp life, and power consumption
power consumption
Applications
4
L
X
3
C
S
7
V
A
6
V
B
803_01.eps
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imp803 Summary of contents

  • Page 1

    ... IMP803. 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 180V peak-to-peak. This conserves power and extends battery life. The IMP803 is available in MicroSO and SO-8 packages and in die or wafer form. Block Diagram 1 V ...

  • Page 2

    ... Pin Configuration IMP803 R 2 SW-OSC Ordering Information 803 IMP LG 2.0V to 6.5V 803 IMP IMA 2.0V to 6.5V IMP 803 SX* 2.0V to 6.5V IMP 803/ D1** 2.0V to 6.5V * Disable pad not active ** Disable pad active Add /T to ordering part number for Tape and Reel. ...

  • Page 3

    vs. Inductor Value CS IN 100 200 400 600 Inductor (µ vs 100 L = 470µ ...

  • Page 4

    ... The IMP803 generates high voltages and caution should be exercised. 4 Positive voltage supply for the IMP803. 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 IMP803 configured to drive a 3-square-inch EL lamp, represented as a 10nF capacitor. With a 3.0V input, the EL lamp will be driven to moderate brightness 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. ...

  • Page 6

    ... V = 6.0V IN – 0.1µF Note: 1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω Larger values may be required depending upon supply impedance. Enable/Disable Operation Figure 4 shows that the IMP803 can be enabled via a logic gate that connects and disabled by connecting it to ground OFF = ...

  • Page 7

    ... Dual Supply Operation with 1.5V Battery The IMP803 can also be operate from a single battery cell when a regulated voltage higher than 2.0V is also available. This dual supply configuration, shown in Figure 5, uses the regulated voltage to operate the IMP803 while the energy for the high- voltage boost circuit comes from the battery. ...

  • Page 8

    Package Dimensions 0.10mm e 0.004in A1 b IMP, Inc. Corporate Headquarters 2830 N. First Street San Jose, ...