Test Equipment
6
SLUUBW8 – July 2018
Copyright © 2018, Texas Instruments Incorporated
TPS543C20EVM-054 40-A Single Phase Synchronous Step-Down Converter
5
Test Equipment
Voltage Source:
The input voltage source VIN must be a 0-V to 18-V variable DC source capable of
supplying at least 10 A
DC
. Also, the output impedance of the external voltage source must be much less
than 100 k
Ω
.
Multimeters:
It is recommended to use two separate multimeters
. One meter is used to measure
V
IN
and one to measure V
OUT
.
Output Load:
A variable electronic load is recommended for testing
. It must be capable of 40 A
at voltages as low as 0.6 V.
Oscilloscope:
An oscilloscope is recommended for measuring output noise and ripple. Output ripple must
be measured using a tip-and-barrel method or better as shown in
.The scope must be adjusted to
20-MHz bandwidth, AC coupling at 50 mV/division, and must be set to 1-µs/division.
Fan:
During prolonged operation at high loads, it may be necessary to provide forced air cooling with a
small fan aimed at the EVM. Temperature of the devices on the EVM must be maintained below 105°C.
Recommended Wire Gauge:
The voltage drop in the load wires must be kept as low as possible in order
to keep the working voltage at the load within its operating range. Use the AWG 14 wire (2 wires parallel
for VOUT positive and 2 wires parallel for the VOUT negative) of no more than 1.98 feet between the EVM
and the load. This recommended wire gauge and length should achieve a voltage drop of no more than
0.2 V at the maximum 40-A load.
