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參數(shù)資料
| 型號(hào)： | IMP803ISX |
| 英文描述： | Interface IC |
| 中文描述： | 接口IC |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大小： | 184K |
| 代理商： | IMP803ISX |
Pin Number
1
Name
V
DD
Function
Positive voltage supply for the IMP803. Inductor L may be connected here or to a
separate unregulated supply.
Switch-mode resistor pin. Switching frequency is determined by an external resistor, R
SW
.
Boost converter storage capacitor. The voltage across the EL lamp is equal to twice the
voltage at C
S
.
Connection to flyback inductance, L.
Ground pin.
EL lamp drive. The lamp is connected in a high-voltage bridge circuit with V
B
providing
the complementary connection to V
A
. The peak-to-peak AC voltage across the EL lamp is
thus two times V
CS
.
EL lamp drive. (See above)
The EL lamp oscillator frequency setting pin. The oscillator frequency is controlled
by external resistor R
EL
.
2
3
R
SW-OSC
C
S
4
5
6
L
X
GND
V
B
7
8
V
A
R
EL-OSC
IMP803
4
408-432-9100/www.impweb.com
1999 IMP, Inc.
External Component
Diode
Description and Selection Guide
Catch diode. A fast reverse recovery diode, with BV > 100, such as a 1N4148.
Capacitor C
S
This is the high voltage capacitor that stores the inductive energy transferred through the
catch diode. A 100 volt capacitor between 10nF and 100nF is recommended.
Resistor R
EL
The EL lamp oscillator frequency setting resistor. This resistor, connected between the
R
EL-OSC
pin and V
DD
, provides an oscillator frequency inversely proportional to R
EL
;
as R
EL
increases, the EL lamp frequency decreases along with the current drawn by the lamp.
Lamp color is also determined by this frequency. A 2M
resistor between the R
EL-OSC
pin and the
V
DD
supply results in a lamp frequency around 350Hz: a 1M
resistor will give
≈
700Hz.
Switching Oscillator frequency setting resistor. The switching oscillator resistor is connected
between the R
SW-OSC
pin and the V
DD
supply. The switching frequency is inversely proportional
to the resistor value, dropping as the resistance increases.
Resistor R
SW
Inductor L
The inductor provides the voltage boost needed by means of inductive
“
flyback
”
. The internal
MOSFET switch alternately opens and closes the ground connection for the inductor at the
L
X
pin. When this internal switch opens, the inductor potential will forward-bias the catch
diode and the current will pass through the storage capacitor C
S
, charging it to a high voltage.
Smaller inductors are preferred to prevent saturation. As the value of the inductor
increases (and the series DC resistance of the inductor decreases), the switching frequency
set by R
SW
should be increased to prevent saturation. In general, smaller value inductors that
can handle more current are more desirable when larger area EL lamps must be driven.
Lamp, R
CL
An external resistor (R
CL
) in series with the lamp will protect the output drivers from high transient
currents during lamp commutation.
Pin Descriptions
External Components
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IMP803ISXT | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Interface IC |
| IMP803LG | 制造商:IMP 制造商全稱(chēng):IMP 功能描述:HIGH-VOLTAGE EL LAMP DRIVER |
| IMP803LG/T | 制造商:IMP 制造商全稱(chēng):IMP 功能描述:Ballast/Backlight Controller/Driver |
| IMP803SX | 制造商:IMP 制造商全稱(chēng):IMP 功能描述:HIGH-VOLTAGE EL LAMP DRIVER |
| IMP805L | 制造商:A1PROS 制造商全稱(chēng):A1 PROs co., Ltd. 功能描述:μP Power Supplly Superviissor wiitth Battttery Backup Swiittch |
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