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 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.

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