LM5170-Q1 EVM
+
-
+10 V
UVLO
EN1/2
DIR
ISETA or
ISETD
+
-
48 VDC
12 VDC
RTN
RTN
HV-PS
LV-PS
HV-E-Load
LV-E-Load
Setup
11
SNVU543A – November 2016 – Revised December 2016
Copyright © 2016, Texas Instruments Incorporated
LM5170-Q1 EVM User Guide
2.2
Bench Setup
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.
Figure 3. Bidirectional Converter Bench Setup
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.
