PI31XX-01-HVIZ Datasheet, PDF (16/18 Pages) Vicor Corporation – 24VIN, 5V and 12VOUT, ZVS Isolated Converter Module Family

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 PI31xx-01-HVIZ 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 PI31xx-01-HVIZ 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 PI31xx-01-HVIZ 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 PI31xx-01-HVIZ 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 PI31xx-01-HVIZ 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 vicorpower.com for a remote sense application
circuit which can be used.
PI31xx-01-HVIZ
24 Volt
Page 16 of 18
Rev 1.4
02/2015
vicorpower.com
800 927.9474