Rev 21 Jan 2014 15:09 | Page 19

The voltage of VTH is 0.500 V.

Figure 20. Monitoring Voltage Threshold Setting

External Resistor Divider Setting for Bucks and POR

The ADP5051/ADP5053 evaluation boards are supplied with the resistor divider for a target output

voltage. Varying the resistor values of the resistor divider networks varies the output voltage

accordingly. Table 3 shows the external resistor divider for each channel.

Table 3. External Resistor Dividers in Each Channel

Resistor Divider Buck 1 Buck 2 Buck 3 Buck 4

R

TOP

R2

R4

R6

R5

R

BOT

R28

R29

R31

R30

The POR function, by default, monitors the Channel 2 output voltage; optionally, another channel can

be selected using VOUT1, VOUT3, or VOUT4. Table 4 lists the external resistor for each channel.

Table 4. External Resistor Dividers for VTH Setting

Resistor Divider Buck 1 Buck 2 Buck 3 Buck 4

R

TOP

R62

R61

R60

R59

R

BOT

R13

R13

R13

R13

Changing the Switching Frequency

The switching frequency of theADP5051/ADP5053 on the evaluation board is programmed at 650 kHz.

To change the switching frequency, replace the R3 resistor at the RT pin with a different value, as

shown in Figure 21.