General Configuration and Description
7
SLVUBC9 – December 2017
Copyright © 2017, Texas Instruments Incorporated
TPS23523EVM-863 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 hot swap is up
Follow these steps to properly set-up the device:
1. Set the input power-supply voltage to the desired operating input voltage.
2. Turn the power supply off.
3. Jump pins on J7 and J8, depending on the desired resistor.
4. Leave pins 1-2 on J3 open.
5. Connect the positive voltage lead from the power supply to J1 (RTN). Connect the ground lead from
the power supply to J4 (Neg48V).
6. Make sure all voltmeter and oscilloscope GNDs are tied to VEE.
7. 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 a scope GND is tied to RTN,
and a probe is placed on TMR that is approximately 5 µA of pullup current, this can overpower the
pulldown of the TMR pin and result in a time out.
•
Scope GND is tied to Earth GND, which has some capacitance to supply (+) and (–) terminals. This
may cause system noise.
4
Test Results
This section provides typical performance waveforms for the TPS23523EVM-863. 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.
No load, scope GND = –48V_A
Figure 4. Start Up (V
IN
= 54 V)
No load, scope GND = –48V_A
Figure 5. Start Up (V
IN
= 54 V)
