PI3105-00-HVIZ_16 Datasheet, PDF (20/22 Pages) Vicor Corporation – Cool-Power ZVS Isolated DC-DC Converter Modules

TM
The TM pin serves as an output indicator of the internal package
temperature which is within +/- 5°K of the hottest junction
temperature. Because of this, it is a good indicator of a thermal
overload condition. The output is a scaled, buffered analog voltage
which indicates the internal temperature in degrees Kelvin. Upon a
thermal overload, the TM pin is pulled low, indicating a thermal fault
has occurred. Upon restart of the converter, the TM pin reverts back
to a buffered monitor. The thermal shutdown function of the
48 Volt PI31xx is a fault feature which interrupts power processing if
a certain maximum temperature is exceeded. TM can be monitored
by an external microcontroller or circuit configured as an adaptive
fan speed controller so that air flow in the system can be
conveniently regulated.
SGND
The 48 Volt PI31xx SGND pin is the “quiet” control circuitry return. It
is basically an extension of the internal signal ground. To avoid
contamination and potential ground loops, this ground should NOT
be connected to -IN since it is already star connected inside the
package. Connect signal logic to SGND.
Output Power Pins +OUT And -OUT
The output power terminals OUT(+) and OUT(-) deliver the
maximum output current from the 48 Volt PI31xx through the
J-lead output pins. This configuration allows for a low impedance
output and should be connected to multi-layer PCB parallel planes
for best performance. Due to the high switching frequency, output
ripple and noise can be easily attenuated by adding just a few high
quality X7R ceramic capacitors while retaining adequate transient
response for most applications. The 48 Volt PI31xx does not require
any feedback loop compensation nor does it require any opto-
isolation. All isolation is contained within the package. This greatly
simplifies the use of the converter and eliminates all outside
influences of noise on the quality of the output voltage regulation
and feedback loop. It is important for the user to minimize resistive
connections from the load to the converter output and to keep stray
inductance to a minimum for best regulation and transient response.
The very small size footprint and height of the 48 Volt PI31xx allows
the converter to be placed in the optimum location to allow for tight
connections to the point of load. For those applications absolutely
requiring very tight regulation, contact Picor Engineering at
picorpower.com for a remote sense application circuit which can
be used.
48 Volt PI31xx
Cool-Power®
Page 20 of 22
Rev 1.2
02/2015
vicorpower.com
800 927.9474