S i 8 2 5 x M u l t i - P h a s e P O L - R D
20
Rev. 0.2
10.2. Switches and LEDs
One switch is provided on the target board. Switch S1 is connected to the RESET pin of the Si8250. Pressing S1
puts the Si8250 device into its hardware-reset state.
Two LEDs are also provided on the target board. The POWER IN LED is used to indicate that the POL target board
is properly powered. The POWER GOOD LED is used to indicate that VOUT power is being regulated by the
Si8250. See Table 2 for a description of each LED and on board switches.
10.3. V
IN
(J1, J2)
The user-provided power supply should be connected to connectors J1 and J2 where J2 is the reference. The
power source must be from 10–15 V with at least 10 A maximum output.
10.4. V
OUT
(J3, J4)
Connectors J3 and J4 are the dc output from the Si8250 Multi-Phase POL Target Board. A load (preferably
electronic) should be connected here.
10.5. V
OUT
(J5, J4)
Connectors J5 and J4 provide an alternate output monitoring note that minimizes output loading while V
OUT
is
being monitored.
Table 2. Target Board Switch and LED Descriptions
Label
Reference
Description
RST
S1
Si8250 Reset Switch
POWERIN
LED
Indicates that V
IN
is operating properly
POWERGOOD
LED
Indicates that V
OUT
is regulated properly
Table 3. J1, J2 Pin Descriptions
Jumper #
Description
J1
10–15 V, 10 A
J2
GND
Table 4. J3, J4 Pin Descriptions
Jumper #
Description
J3
3.3 V (Nominal), 40 A max
J4
GND
Table 5. J5, J4 Pin Descriptions
Jumper #
Description
J5
Alternate V
OUT
Sense, minimal loading
J4
GND
