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http://www.union-ic.com

Rev.02 Jan.2013

13/15

UM1350

The higher forward voltage and overshoot due to reverse recovery time in silicon diodes will

increase the peak voltage on the LX output. If a silicon diode is used, care should be taken to

ensure that the total voltage appearing on the LX pin including supply ripple, does not exceed

the specified maximum value.

PCB Layout Guidelines

Careful PCB layout is critical to achieve low switching losses and stable operation. Minimize

ground noise by connecting high current ground returns, the input bypass capacitor ground lead,

and the output filter ground lead to a single point. Place Rs as close as possible to the Isense and

Rs.