MP2489 – STEP DOWN WLED DRIVER WITH WIDE 6V–60V INPUT VOLTAGE
MP2489 Rev. 1.23 www.MonolithicPower.com 10
10/11/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
Layout Consideration
Careful attention must be paid to the PCB board
layout and components placement. R
SENSE
should
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.
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 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
