PI2125 datasheet(18/20 Pages) VICOR

18 / 20 page

Layout Recommendation:

Use the following general guidelines when designing

printed circuit boards. An example of the typical

land pattern for the PI2125 in floating configuration

is shown in Figure 24:

Picor Corporation • picorpower.com

PI2125

Rev 1.0

Page 18 of 20

•

Make sure to have a sold ground (return) plane

to reduce circuit parasitics.

•

In floating configuration, connect the GND pin to

the S pins with a solid plane. In the event it can

not be done on the top plane, create a plane on

the second layer and use multiple vias from the

S pins to the second layer to reduce parasitics.

Connect the SP pin directly to the PI2125 GND

pin to reduce parasitics between the SP pin and

the GND pin to avoid negative voltages on the

SP pin with respect to the GND pin.

•

Connect all S pads together with a wide trace to

reduce trace parasitics to accommodate the high

input current, and also connect all D pads

together with a wide trace to accommodate the

high output current.

•

Use 1oz of copper or thicker if possible to

reduce trace resistance and reduce power

dissipation.

•

The VC bypass capacitor should be located as

close as possible to the VC and GND pins.

Place the PI2125 and bypass capacitor on the

same layer of the board. The VC pin and CVC

PCB trace should not contain any vias.

•

Keep the power source very close to S input

pins, since any parasitic in the trace connecting

the power source and S pins will have inductive

kick back when there is high current flow in the

trace and the MOSFET turns off due to reverse

current fault conditions. The inductive kick back

will produce a high voltage across the MOSFET.

If it is not possible to connect the power source

and S pins with a very short trace or common

point, connect the capacitor (shown as C4 in

figure 24) close to the S pins and return

(ground). Also for the same reason use C6, in

figure 24 at the output.

Figure 25:

PI2125 Mounted on PI2125-EVAL2

Please visit www.picorpower.com for information on PI2125-EVAL2

Figure 24:

PI2125 layout recommendation

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