MP2489 – STEP DOWN WLED DRIVER WITH WIDE 6V–60V INPUT VOLTAGE

MP2489 Rev. 1.23

www.MonolithicPower.com

10

10/11/2012

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Layout Consideration

Careful attention must be paid to the PCB board

be placed close to the IN pin and RS pin in order

to minimize set current error. The input loop

including input capacitor, schottky diode and

internal MOSFET should be as short as possible.

Radiation EMI Test Result

Figure 6 and 7 represents EMI test results for

EV2489.

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FREQUENCY(MHz)

EN 55022 Electric

Field Strength 3m QP

Preview Measurement MaxPeak

Figure 6—EMI result, Vin=12VAC, Iout=0.24A, 3LEDs, OATS

0

5

10

15

20

25

30

35

40

45

50

55

60

30

50

70 100

200 300

FREQUENCY(MHz)

EN 55022 Electric

Field Strength 3m QP

Preview Measurement MaxPeak

Figure 7—EMI result, Vin=36VAC, Iout=0.35A, 3LEDs, OATS