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參數(shù)資料
| 型號(hào)： | D306A |
| 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(qū)動(dòng)IC |
| 文件頁(yè)數(shù)： | 12/13頁(yè) |
| 文件大小： | 410K |
| 代理商： | D306A |
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12
III. Controlling EL Brightness through Clock Pulse Width Modulation (Option 2)
Pulse width modulation of the external HF input signal also may be used to regulate the brightness of the EL
lamp. As the positive duty cycle of the HF input signal is increased from 10% to 80%, the peak voltage of the
output waveform decrease incrementally to zero output as the inductor charging period is affected by the HF
duty cycle. Lamp dimming is thus achieved with pulse width modulation of the HF input signal to the
D306A. This scheme may also be used inversely to regulate lamp brightness over the life of the battery or to
compensate for lamp aging. Figure 8 shows a typical dimming curve with this technique. The recommended
HF duty cycle range is from 10% to 80%. Clocking frequency can range from 20 KHz to 35 KHz. The
maximum amplitude of the clock signal may range from 1.0V to Vcc.
Figure 8: Dimming through HF Clock Input Duty Cyle
0
4
8
12
16
20
24
0%
10%
20%
30%
40%
50%
60%
70%
80%
90% 100%
CHF Clock Input Duty Cycle
L
0
30
60
90
120
150
180
C
Luminance
Current
BAS21
2.2nF
(200V)
10 kOhm
ON
OFF
6.5V
1
2
3
4
5
6
7
8
CLF
CHF
Rf
Cs
Va
Vb
Vcc
NC
E
L
NC
GND
NC
NC
NC
NC
16
15
14
13
12
11
10
9
EL Lamp
5.0V
200V
800 Hz
10% positive Duty
1.0V Min
0.2V Max
32 kHz
10% to 80%
positive duty PWM
1.0V Min
0.2V Max
D306A
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