General Configuration and Description
5
SLVUB36 – October 2017
Copyright © 2017, Texas Instruments Incorporated
TPS23525EVM-815 Evaluation Module
3.2
Equipment Setup
Use the following equipment list and setup steps to work with the EVM:
•
2× power supplies capable of
≥
60 V and
≥
15 A (preferred)
•
Resistive or electronic load – only turn on the load after the hot swap is up
•
Set the input power-supply voltage to the desired operating input voltage
•
Turn the power supply off
•
Jump pins 1-2 on J5
•
Leave pins 1-2 on J6 open
•
Connect the positive voltage lead from the power-supply A to J1 (RTN). Connect the ground lead from
the power-supply A to J10 (Neg48V_A).
•
Connect the positive voltage lead from the power-supply B to J3 (RTN). Connect the ground lead from
the power-supply B to J7 (Neg48V_B).
•
Make sure all voltmeter or oscilloscope GNDs are tied to VEE
•
Turn the power supplies on
3.3
Scope Considerations
Observe the following scope considerations:
•
Most scopes have a 10-M
Ω
resistance between scope GND and probe.
•
If scope GND is tied to RTN and a probe is placed on TMR, that creates approximately 5
μ
A of pullup
current which can overpower the pull down of the TMR pin and result in an undesired time out.
4
Test Results
This section provides typical performance waveforms for the TPS23525EVM-815 board. Actual
performance data is affected by measurement techniques and environmental variables; therefore, these
curves are presented for reference and may differ from actual results obtained. All curves are based on
V
IN
= 48 V, unless stated otherwise.
No Load, Scope GND = –48V_A
Figure 2. Start Up (V
IN
= 54 V)
No Load, Scope GND = –48V_A
Figure 3. Start Up (V
IN
= 54 V)
