ZXLD1374

ZXLD1374

Document number: DS35032 Rev. 1 - 2

Page 30 of 35

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October 2010

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PCB Layout considerations

PCB layout is a fundamental activity to get the most of the device in all configurations. In the following section it is possible

to find some important insight to design with the ZXLD1374 both in Buck and Buck-boost/Boost configurations.

Figure 51. Circuit Layout

Here are some considerations useful for the PCB layout:

-

In order to avoid ringing due to stray inductances, the inductor L1, the anode of D1 and the LX pin should be placed

as close together as possible.

-

The shaping capacitor C1 is fundamental for the stability of the control loop. To this end it should be placed no more

than 5mm from the SHP pin.

-

X7R, 100V (C3 and C4). In addition to these capacitors, it is suggested to add two ceramic capacitors of 1uF, X7R,

the device

is used in Buck mode, or can be driven from a separate supply.