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參數(shù)資料
| 型號： | D372A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Electroluminescent Lamp Driver IC |
| 中文描述： | 電致發(fā)光燈驅動IC |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 448K |
| 代理商： | D372A |
D372 Design Ideas
I. Lamp Frequency Control With an External Clock Signal
An external clock signal may be used to control the EL lamp frequency (LF) by applying the clock signal to the CLF pin.
The oscillator frequency can be varied to synchronize the inverter with other elements in the application. An internal
divider network in the IC divides the clock signal by two. The recommended clocking frequencies range from 500Hz
to 1kHz and result in an EL lamp frequency range of 250Hz to 500Hz respectively. The amplitude of the clock signal
typically ranges from 1.0V to V+.
II. Controlling EL Brightness Through Clock Pulse Width Modulation
An external clock signal may be used to control the inductor oscillating frequency (HF). Pulse width modulation of the
external clock signal may be used to regulate the brightness of an EL lamp. In this circuit, when the positive duty cycle
of the external clock is at 20%, the lamp is at full brightness. Incremental dimming occurs as the positive duty cycle is
increased to as high as 85%. This scheme may also be used inversely to regulate lamp brightness over the life of the
battery or to compensate for lamp aging. (Note: Operation at duty cycles higher than 85% and lower than 20% is not
recommended.) The recommended clocking frequency ranges from 10kHz to 24kHz, and the amplitude of the clock
signal typically ranges from 1.0V to V+.
10
V+
CLF
CHF
E
GND
Rd
EL2
EL1
Cs
L+
D372A
1
2
3
4
5
10
9
8
7
6
CHF
0.1
μ
F
Vbat
off
on
EL Lamp
L
Cs
Rd
Vbat
1V
0V
LF CLK
50%DC
V+
CLF
CHF
E
GND
Rd
EL2
EL1
Cs
L+
D372A
1
2
3
4
5
10
9
8
7
6
CLF
0.1
F
Vbat
off
on
EL Lamp
L
Cs
Rd
Vbat
HF CLK
20%-85% +DC
1V
0V
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