Thermal Considerations
The PI31xx-xx-EVAL1 is supplied with optional heat sinks. At present, Picor offers four
different 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.
Table 1.
Pin
Type
Description
PI31xx-xx-EVAL1
Input-Output Pin Description
Name
IN+
Input/Lug
Input/Lug
Output/Lug
Output/Lug
Test/Pin
Primary side positive input voltage terminal.
IN-
Primary side negative input voltage terminal.
OUT+
OUT-
TM
Isolated secondary DC output voltage positive terminal.
Isolated secondary DC output voltage negative terminal.
Temperature measurement output pin with respect to SGND. 3V=300°K 10mV/°K
Signal ground, primary side referenced.
SGND
Test/Pin
Monitor pin for the soft start voltage and trim voltage reference with
respect to SGND.
TRIM/SS
ENABLE
INN
Test/Pin
Test/Pin
Test/Pin
Allows for monitoring of the ENABLE signal with respect to SGND.
Kelvin sense connection for input supply (-) and input voltage measurement
test point.
Kelvin sense connection for input supply (+) and input voltage measurement
test point.
INP
YN
Test/Pin
Output/Pad
Output/Pad
Test/Pin
Optional test pad for connection of optional “YN” capacitor to external
system ground.
Optional test pad for connection of optional “YP” capacitor to external
system ground.
YP
Kelvin sense connection for output voltage (+) and output voltage measurement
test point.
OUTP
Kelvin sense connection for output voltage (-) and output voltage measurement
test point.
OUTN
OUT
Test/Pin
Test/PIn
PCB test jack for low noise measurement of the output voltage.
Table 2.
Name
Description
PI31xx-xx-EVAL1
Evaluation Board
Pin Strap and Jumper
Description
ENABLE
TRIM_UP
TRIM_DN
OPT1
If strap is installed, unit is turned off. If strap is removed, unit will be enabled.
If strap is installed, PI3105 trims output voltage up 10%
If strap is installed, PI3105 trims output voltage down 10%
Allows optional connection of heat sink assembly to secondary return (-IN)
Allows optional connection of heat sink assembly to secondary return (-OUT)
OPT2
UG:301
vicorpower.com
Applications Engineering: 800 927.9474
Page 4
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