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Test Procedure
3
Test Procedure
Please read the LM5170-Q1 datasheet (SNVSAQ6) and this user guide before using the EVM. A typical
EVM test bench setup is shown in
the input and output voltage and current rating of the board.
The EVM operation requires the four external control signals, which are UVLO, DIR, EN1/2, and ISETA or
ISETD (refer to
Figure
•
UVLO: The master enable command. Apply a voltage > 2.5 V and < 6 V between J17-pins 5 and 6 to
enable the EVM. Pulling the voltage at J17-pin 5 low will keep the EVM in shutdown mode.
•
DIR: the current direction command. Apply a voltage > 2 V at J17-pin 9 or J18-pin 9 to operate the
EVM in Buck Mode. Apply a voltage < 1 V at the same pin to operate the EVM in Boost Mode. DIR
command can also be programmed using J28. Note that DIR must be either active high or low to
operate the EVM. If the DIR signal is floating, the EVM will not run.
•
EN1 and EN2: The channel switching enable commands. Apply a voltage > 2 V at J17-pin 7 will turn
on CH-1 converter, and at J17-pin 21 will turn on CH-2 converter. Removing the voltage at the EN1
and EN2 pins to disable each channel. The channel enable can also be controlled by J29, J30 and
J25.
•
ISETA or ISETD: The Channel current regulation setting. Applying an analog voltage across J17-pins
11 and 12, or J18-pins 11 and 12, or a PWM signal across J17-pins 13 and 14, or J18-pins 13 and 14,
the EVM will regulate the channel DC current, which is also the power inductor dc current, to a level
proportional the ISETA voltage or ISETD PWM duty ratio. ISETA is controlled by the onboard analog
outer voltage control loop when it is closed. Note that, ISETA=1.5 V, or ISETD PWM duty ratio of 48%,
will command the EVM to produce 60 A into or out of the 12VDC-port, depending on the operation
mode.
For initial test, TI recommends using the onboard 10-V bias supply by closing the J4 and J21-pins 2 and
3. The user can also apply an external 10-V bias supply between J17-Pins 43 and 44, but remember to
open J4 and J21 in order to disable the onboard 10-V bias supply.
3.1
Buck Mode Power-Up and Power-Down Sequence
1. Refer to
Table 2
2. Turn on the HV-PS power supply.
3. Turn on the LV-PS power supply and LV-E-Load.
4. Apply a voltage > 2.5 V and < 6 V at J17-pin 5 (Master Enable).
5. Apply an analog voltage gradually rising from 0V to 1.5V at J17-pin 11 or J18-pin 11 (ISETA), or a
PWM signal of duty ratio of 0 to 48% at J17-pin 13 or J18-pin 13.
6. Perform the test.
7. After the tests are done, turn off the ISETA or ISETD signal, remove the voltage at J17-pin 5, and turn
off the E-Load, LV-PS and HV-PS.
12
LM5170-Q1 EVM User Guide
Figure
2. The power supplies and loads should be capable of handling
3).
through
Table 5
for proper jumper settings
Copyright © 2016, Texas Instruments Incorporated
SNVU543A – November 2016 – Revised December 2016
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