Manual
UG:301 vicorpower.com Applications Engineering: 800 927.9474 Page 4
Thermal Considerations
The PI31xx-xx-EVAL1 is supplied with optional heat sinks. At present, Picor oers four
dierent heat sink options to accommodate the customers space and cooling needs.
Heatsinks are available in two sizes, one with 6.3mm fins and the other with 11mm fins.
Each of those heatsinks can be ordered with a specific air flow direction in mind, both
cross flow and longitudinal are supported. Please refer to the product website
www.vicorpower.com for more information.
Pin
Type Description
Name
IN+ Input/Lug Primary side positive input voltage terminal.
IN- Input/Lug Primary side negative input voltage terminal.
OUT+ Output/Lug Isolated secondary DC output voltage positive terminal.
OUT- Output/Lug Isolated secondary DC output voltage negative terminal.
TM Test/Pin Temperature measurement output pin with respect to SGND. 3V=300°K 10mV/°K
SGND Test/Pin Signal ground, primary side referenced.
TRIM/SS Test/Pin
Monitor pin for the soft start voltage and trim voltage reference with
respect to SGND.
ENABLE Test/Pin Allows for monitoring of the ENABLE signal with respect to SGND.
INN Test/Pin
Kelvin sense connection for input supply (-) and input voltage measurement
test point.
INP Test/Pin
Kelvin sense connection for input supply (+) and input voltage measurement
test point.
YN Output/Pad
Optional test pad for connection of optional “YN” capacitor to external
system ground.
YP Output/Pad
Optional test pad for connection of optional “YP” capacitor to external
system ground.
OUTP Test/Pin
Kelvin sense connection for output voltage (+) and output voltage measurement
test point.
OUTN Test/Pin
Kelvin sense connection for output voltage (-) and output voltage measurement
test point.
OUT Test/PIn PCB test jack for low noise measurement of the output voltage.
Name Description
ENABLE If strap is installed, unit is turned off. If strap is removed, unit will be enabled.
TRIM_UP If strap is installed, PI3105 trims output voltage up 10%
TRIM_DN If strap is installed, PI3105 trims output voltage down 10%
OPT1 Allows optional connection of heat sink assembly to secondary return (-IN)
OPT2 Allows optional connection of heat sink assembly to secondary return (-OUT)
Table 1.
PI31xx-xx-EVAL1
Input-Output Pin Description
Table 2.
PI31xx-xx-EVAL1
Evaluation Board
Pin Strap and Jumper
Description