MP1518DG-LF

更新时间： 2025-07-15 13:11:43

品牌	Logo	应用领域
芯源 - MPS		驱动器
页数	文件大小	规格书
9页	251K
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数据手册

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MP1518DG-LF 数据手册

MP1518 – FIXED FREQUENCY WHITE LED DRIVER

Startup Waveforms

Analog and Digital Dimming

= 3.6V, 3 LEDs, 20mA

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_DCfrom 0V to 2V,

the resistor values shown for R2 and R3 can

control the LED current from 0mA to 20mA.

5V/div.

100mA/div.

Figure 4—Startup Waveforms

Figure 5 shows the dependence on current limit

versus duty cycle.

LED1

LED2

LED3

500

400

300

200

100

MP1518

Figure 6—Dimming Control Using a DC

Voltage

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_LEDvs. R1

I_LED(mA)

R1 (Ω)

104

20.8

10.4

6.93

5.2

MP1518 Rev. 1.6

7/25/2006

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

1...3 4 567 8 9

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