Rev 21 Jan 2014 15:09 | Page 18

Measure the inductor current by removing one end of the inductor from its pad and connecting a

current loop in series. A current probe can be connected to this wire.

Modifying the Board

Setting the Output Voltage of the Bucks (CH1 to CH4)

The buck output voltage is set through external resistor dividers, shown in Figure 19 for Buck 1.

Optionally, the output voltage can be factory programmed to default values, as indicated in the

ADP5051/ADP5053 data sheet. FB1 must be connected to the top of the capacitor on VOUT1 by

placing a 0 Ω resistor on R

setting is

The V

Figure 19. Buck 1 External Output Voltage Setting

When the output voltage of the bucks are changed, the values of inductors, output capacitors, and

compensation networks might, likewise, need to be recalculated and changed for stable operation.

See the ADP5051/ADP5053 data sheet for more details on external components selection.

Setting the POR Threshold Voltage

The monitoring voltage can be set through external resistor dividers, as well (see Figure 20). The

equation for the monitoring voltage is