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參數(shù)資料
| 型號： | MP1518DJE |
| 廠商： | MONOLITHIC POWER SYSTEMS INC |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Fixed Frequency White LED Driver |
| 中文描述： | LED DISPLAY DRIVER, PDSO6 |
| 封裝： | MO-193AB, TSOT-23, 6 PIN |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 260K |
| 代理商： | MP1518DJE |
MP1518 – FIXED FREQUENCY WHITE LED DRIVER
MP1518 Rev. 1.6
7/25/2006
www.MonolithicPower.com
6
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
V
EN
5V/div.
V
5V/div.
I
IN
100mA/div.
Startup Waveforms
V
IN
= 3.6V, 3 LEDs, 20mA
Figure 4—Startup Waveforms
Figure 5 shows the dependence on current limit
versus duty cycle.
500
400
300
200
100
0
C
0
20
40
60
80
100
DUTY CYCLE (%)
Figure 5—Current Limit vs. Duty Cycle
Setting the LED Current
The LED current is controlled by the feedback
resistor, R1, in Figure 6. The current through
the LEDs is given by the equation 104mV/R1.
Table 2 shows the selection of resistors for a
given LED current.
Table 2—I
LED
vs. R1
I
LED
(mA)
1
5
10
15
20
R1 (
)
104
20.8
10.4
6.93
5.2
Analog and Digital Dimming
There are three different ways to control
dimming for the MP1518 during normal
operation. The first way uses a DC voltage to
control the feedback voltage. This can be seen
in Figure 6. As the DC voltage increases,
current starts flowing down R1, R2 and R3. The
loop will continue to regulate the feedback
voltage to 104mV. Thus the current has to
decrease through the LEDs by the same
amount of current as is being injected from the
DC voltage source. With a V
DC
from 0V to 2V,
the resistor values shown for R2 and R3 can
control the LED current from 0mA to 20mA.
MP1518
LED1
LED2
LED3
FB
V
DC
Figure 6—Dimming Control Using a DC
Voltage
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