A power supply capable of
providing 10 A or greater must be connected to J3 (PVIN) through a pair of
14-AWG wires or better. The PVIN test points, PVIN_SNS and PGND_SNS, provide a
place to monitor the PVIN input voltage. Do not use these monitoring test points
as the input supply connection points. The PCB traces connecting to these test
points are not designed to support high currents.
The load must be connected to J4 (VOUT) with a pair of 10-AWG wires or better.
Wire lengths must be minimized to reduce losses in
the wires. If there is too much voltage drops in the wires, then the electronic
load may not be able to sink the full rated current. The VO_REG test point is
used to monitor the output voltage with GND_REG as the ground reference.
When testing with an external 5-V bias supply to power VCC/VDRV, connect the
external supply to J5 (EXTBIAS) with a pair of 20-AWG wires or better.
To test the VINSENP function,
connect a load to J2 (IEXT) with a pair of 14-AWG wires or better. When testing
this function, the PVIN power supply must be capable of sourcing this additional
external load current. Additionally, the load must have the proper voltage and
power rating. For example, when the voltage at PVIN is 12 V and if pulling 20 A
out of J2, the power supply must also source an additional 20 A and the load
must have a power rating of at least 240 W.
The PMBus Interface connector
(J13) is provided to connect the USB-to-GPIO interface adapter to the EVM. Click here to order the adapter. The USB-to-GPIO interface adapter
connects the EVM to a computer USB port which allows the Fusion Digital
Power™ graphical user interface (GUI) to communicate and control the
EVM.
If modifications are made to the
TPS544C26EVM, the input current can change. The
input power supply and wires connecting the EVM to the power supply must be
rated for the input current.