Thermal considerations – Vicor PI31xx-xx-EVAL1 Cool-Power ZVS Isolated DC-DC Converter Evaluation Board User Manual
Page 4
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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
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