CS5161GD16 datasheet(15/18 Pages) ONSEMI

15 / 18 page

CS5161, CS5161H

http://onsemi.com

Layout Guidelines

1. Place 12 V filter capacitor next to the IC and connect

capacitor ground to pin 11 (PGnd).

2. Connect pin 11 (PGnd) with a separate trace to the

ground terminals of the 5.0 V input capacitors.

3. Place fast feedback filter capacitor next to pin 8 (VFFB)

and connect it’s ground terminal with a separate, wide

trace directly to pin 14 (LGnd).

4. Connect the ground terminals of the Compensation

capacitor directly to the ground of the fast feedback

filter capacitor to prevent common mode noise from

effecting the PWM comparator.

5. Place the output filter capacitor(s) as close to the load

as possible and connect the ground terminal to pin 14

(LGnd).

6. Connect the VFB pin directly to the load with a separate

trace (remote sense).

7. Place 5.0 V input capacitors close to the switching

MOSFET and synchronous MOSFET.

Route gate drive signals VGATE(H) (pin 10) and

VGATE(L) (pin 12 when used) with traces that are a

minimum of 0.025 inches wide.

Figure 23. Layout Guidelines

To the negative terminal of the output capacitors

VCC

100 pF

0.1 μF

SOFT START

OFF TIME

VCOMP

To the negative terminal

of the input capacitors

VFFB

1.0 μF

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