MP150 – OFFLINE PRIMARY-SIDE REGULATOR
MP150 Rev. 1.15 www.MonolithicPower.com 15
9/25/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
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Layout Guide
PCB layout is very important to achieve reliable
operation, good EMI, and good thermal
performance. Follow these guidelines to optimize
performance.
1) Minimize the loop area formed by the input
capacitor, IC part, freewheeling diode,
inductor and output capacitor.
2) Place the power inductor far away from the
input filter.
3) Add a capacitor in the several-hundred pF
range between the FB and source pins, as
close as to the IC as possible.
4) Connect the exposed pad with the Drain pin
to a large copper area to improve thermal
performance.
Top
Bottom Layer
Design Example
Below is a design example following the
application guidelines given the following
specifications:
Table 3: Design Example
V
IN
85 to 265Vac
V
OUT
5V
I
OUT
200mA
Figure 12 shows the detailed application
schematic. The Typical Performance
Characteristics section lists typical performance
and circuit waveforms. For more device
applications, refer to the related Evaluation Board
Datasheets.
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