Boost Mode Power-Up And Power-Down Sequence; Bidirectional Operation Power-Up And Power-Down Sequence; Operating The Evm With External Mcu Or Other Digital Circuit - Texas Instruments LM5171-Q1 User Manual

Test Procedure

3.2 Boost Mode Power-Up and Power-Down Sequence

For Boost Mode with Voltage Regulation,
1. Refer to Boost Mode with Voltage Regulation
2. Set HV-E-Load to CC mode. Turn on the LV-PS power supply and HV-E-Load.
3. Perform the test.
4. After the tests are done, and turn off the LV-PS and HV-E-Load.
For Boost Mode with Current Regulation,
1. Refer to Buck Mode with Current Regulation
2. Set HV-E-Load to CV mode. Turn on the LV-PS power supply and HV-E-Load.
3. Apply an analog voltage gradually rising from 1 V to 2.2 V at J17-pin 11 or J18-pin 11 (ISETA), or a PWM
signal at J17-pin 13 or J18-pin 13.
4. Perform the test.
5. After the tests are done, set ISETA to 1 V, and turn off the LV-PS and HV-E-Load.

3.3 Bidirectional Operation Power-Up and Power-Down Sequence

1. Refer to Table 2-1 through
2. Turn on the HV-PS power supply and HV-E-Load.
3. Turn on the HV-PS power supply and HV-E-Load.
4. Apply a voltage > 2.5 V and < 6 V at J17-pin 5 (Main Enable).
5. Apply the direction command (DIR) at J17-pin 9 or J18-pin 9.
6. Apply an analog voltage gradually rising from 1 V to 2.2 V at J17-pin 11 or J18-pin 11 (ISETA), or a PWM
signal at J17-pin 13 or J18-pin 13.
7. Dynamically flip the DIR signal state between 0 (DIR < 1 V) and 1 (DIR > 2 V), the EVM operates in dynamic
bidirectional transition mode. In FPWM mode, you may also change direction by setting ISETA below 1V.
8. Perform the test.
9. After the tests are done, set ISETA to 1 V, remove the voltage at J17-pin 5, and turn off the E-Load, HV-PS
and LV-PS.

3.4 Operating the EVM With External MCU or Other Digital Circuit

1. Onboard analog voltage loop control circuit must be disconnected.
2. Use J17 header to interface the external MCU or other control circuit.
3. Follow the power-up and power-down sequence for buck mode or boost mode operation.
Signals required from an MCU or other digital control circuit include UVLO, EN1/EN2, DIR, ISETA or ISETD.
Contact TI for info on operating the EVM with the MSPM0 Launchpad or C2000 MCU.
22 LM5171-Q1 EVM User Guide
for proper jumper settings.
for proper jumper settings.
Table 2-4 for proper jumper settings.
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SNVU843 – APRIL 2023
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