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Application Information

For minimum noise problem and best operating performance, the PCB is preferred to following the guidelines as reference.

1.

Place the input decoupling capacitor as close to

HM8118 (VIN pin and GND) as possible to eliminate noise at the input pin.

The loop area formed by input capacitor and GND must be minimized.

2.

Put the feedback trace as far away from the inductor and noisy power traces as possible.

3.

The ground plane on the PCB should be as large as possible for better heat dissipation.

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Reference Design

Reference 1:

VIN

EN

SW

FB

GND

VIN

VOUT

HM8118

GND

GND

R1

10uF

22uF

L1 6.8uH

BST

C2 100nF

0.1uF

75KΩ

R2

24KΩ

100KΩ

Reference 2:

VIN

EN

SW

FB

GND

VOUT

HM8118

GND

10uF

L1 10uH

BST

C2 100nF

R1

126KΩ

R2

24KΩ

VIN

GND

22uF

0.1uF

100KΩ

HM