FP6166

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Rev. 0.65

13/19

Output Voltage Programming

In the adjustable version, the output voltage is set using a resistive voltage divider from the output

voltage to FB. The output voltage is:

















2

1

O

R

R

1

V

6

.

0

V

The recommended resistor value is summarized below:

PC Board Layout Checklist

short, direct and wide.

the pulsing input current.

3. The resistive divider R1and R2 must be connected to FB pin directly as closely as possible.

4. FB is a sensitive node. Please keep it away from switching node, SW. A good approach is to

route the feedback trace on another layer and to have a ground plane between the top layer

and the layer on which the feedback trace is routed. This reduces EMI radiation on to the

DC-DC converter’s own voltage feedback trace.

ground-plane (if one is used) with several vias. This reduces ground plane noise by preventing

the switching currents from circulating through the ground plane. It also reduces ground

bounce at the FP6166 by giving it a low impedance ground connection.

0.6

200k

Not Used

Not Used

1.2

200k

200k

10p

1.5

300k

200k

10p

1.8

200k

100k

10p

2.5

270k

85k

10p

3.3

306k

68k

10p