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2.2
Bench Setup
Figure 3
shows the typical bench setup to operate the EVM in the bidirectional power system environment.
The combination of the Electronic Load (E-Load) and bench Power Supply (PS) emulates a battery
capable of both sourcing and sinking current. A relatively Higher Voltage Power Supply (HV-PS) and E-
Load (HV-E-Load) should be used for the 48VDC-port, and a Lower Voltage Power Supply (LV-PS) and
E-Load (LV-E-Load) for the 12VDC-port. The external control signals shown as dashed lines can also be
created with the onboard headers.
+
-
HV-E-Load
HV-PS
To operate the EVM to full power, the initial setup should follow the guidelines below:
•
Set the LV-E-Load to Constant Current (CC) of 62 A
•
Set the LV-PS voltage at 12 V, and the current limit at 63 A
•
Set the HV-E-Load to CC of 14 A
•
Set the HV-PS voltage at 48 V, and the current limit at 15 A
Note that in Buck Mode operation, the HV-E-load can be turned off, and in Boost Mode operation, the LV-
E-load can be turned off. If the output voltage loop is closed, the LV-PS can be disconnected in Buck
Mode operation. In Boost Mode operation, the HV-PS is required for Boost start-up, which is limited by the
onboard circuit breaker function. If the circuit breaker MOSFETS are shorted and J3 is closed, the HV-PS
is not needed for Boost Mode operation.
2.3
Test Equipment
Power Supplies: HV-PS should be capable of 80V/20A, and LV-PS 40V/80A. To operate 2 EVMs in 4
phase configuration, the HV-PS and LV-PS capabilities should be doubled. Bench power supplies to
generate UVLO, ISETA, DIR, and EN1 and EN2 signals should be capable of 5V/0.1A.
Electronic Loads: The HV-E-Load should be capable of 80V/20A, and LV-E-Load 40V/80A. To operate 2
EVMs in 4 phase configuration, the E-Loads' capabilities should be doubled.
Meters: Because most current meters are rated only to 10 A, shunts are recommended to measure the
current using a DVM.
Oscilloscope: An oscilloscope and 10x probes with at least 20-MHz bandwidth is required. Current probe
capable of 50 A is required to monitor the inductor current via a wire loop inserted to the non-switching
side of the inductor.
SNVU543A – November 2016 – Revised December 2016
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48 VDC
LM5170-Q1 EVM
RTN
+10 V
UVLO
EN1/2
Figure 3. Bidirectional Converter Bench Setup
Copyright © 2016, Texas Instruments Incorporated
12 VDC
RTN
ISETA or
DIR
ISETD
LM5170-Q1 EVM User Guide
Setup
+
-
LV-E-Load
LV-PS
11
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