Test Procedure
13
SNVU543A – November 2016 – Revised December 2016
Copyright © 2016, Texas Instruments Incorporated
LM5170-Q1 EVM User Guide
3.2
Boost Mode Power-Up and Power-Down Sequence
1. Refer to
through
for proper jumper settings.
2. Turn on the HV-PS power supply and HV-E-Load.
3. Turn on the LV-PS power supply.
4. Apply a voltage > 2.5 V and < 6 V at J17-pin 5 (Master Enable).
5. Apply an analog voltage gradually rising from 0 V to 1.5 V 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, HV-PS and LV-PS.
3.3
Bidirectional Operation Power-Up and Power-Down Sequence
1. Refer to
through
for proper jumper settings.
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 (Master Enable).
5. Apply the direction command (DIR) at J17-pin 9 or J18-pin 9.
6. Apply an analog voltage gradually rising from 0 V to 1.5 V 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.
7. Dynamically flip the DIR signal state between 0 (DIR < 1 V) and 1 (DIR > 2 V), the EVM will operate in
dynamic bidirectional transition mode.
8. Perform the test.
9. After the tests are done, turn off the ISETA or ISETD signal, turn off the DIR signal, remove the voltage
at J17-pin 5, and turn off the E-Load, HV-PS and LV-PS.
3.4
Operating the EVM With the Onboard Analog Loop Control Circuit
1. J34 through J37 headers must be closed to activate the onboard analog voltage loop control circuit.
2. To operate the EVM as a regulated voltage source, follow the power up and power down sequence for
buck mode or boost mode operation whichever is appropriate.
3. Note that with the circuit breaker MOSFETs employed by the EVM, HVPS should be applied for boost
start-up. After the start-up, it can be turned off. Only after the circuit breaker MOSFETs are replaced
with a direct short across the breaker will the EVM not require the HV-PS to assist boost start-up.
3.5
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 MSP431 Launchpad or C2000 MCU.
