WS3413E ProductDescription
Bypass Capacitor
FB Pin
The feedback resistor divider should be as close as
The bypass capacitor on VCC pin should be as close as
possible to the VCC and GND pins.
possible to the FB pin, and the trace must keeps away from
dynamic node of the inductor (DRAIN pin trace、the positive
pin and the negative pin of Vo trace), otherwise the FB pin
OVP function might have risk to be mis-triggered by the
system noise.
Ground Path
The power ground path for current sense resistor should
be short and wide, and it should be as close as possible to the
IC ground (pin 2) , otherwise the LED output current accuracy
maybe affected. The IC signal ground for COMP and FB
components should be connected to the IC GND pin with
short traces and should be away from the power ground path.
The Area of Power Loop
DRAIN Pin
To increase the copper area of DRAIN pin for better
thermal dissipation. However, too large copper area may
compromise EMI performance.
The area of main current loop should be as small as
possible to reduce EMI radiation.
The material of PCB
Avoid choosing the material that is easy to absorb the
moisture, just like paper copper-clad laminates.
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