SLVUCI1A August 2022 – December 2022 TPS281C30
While the TPS281C30EVM can be used as a standalone evaluation board without the need of any external microcontroller, the EVM also comes populated with BoosterPack plug-in module headers (J13, J14) to enable easy interface with a Texas Instruments microcontroller. Additionally, by populating jumper J12 the user has the ability to power the underlying LaunchPad™ development kit through the integrated 3.3-V LDO on the TPS281C30EVM. A list of pins connected to the BoosterPack plug-in module header can be seen below in Table 3-1:
| BoosterPack Plug-in Module Pin | Function | Note |
|---|---|---|
| 1 | 3.3-V power rail | Disconnect J12 if powering LaunchPad development kit through USB. |
| 5 | FLT pin used to detect faults | Open drain input. Pullup source can be controlled using jumper J10. |
| 6 | Current sense output from IC | Configure current sense resistor with J14. |
| 38 | Configure DIAG_EN | Make sure J7 is not populated if using microcontroller output. |
| 39 | Configure EN_IC | Make sure J6 is not populated if using microcontroller output. |
| 40 | Configure OL_IC | Make sure J8 is not populated if using microcontroller output. |
Note that for all IO and analog signals being attached to the BoosterPack plug-in module, the relevant 10-kΩ protection resistors are populated in series with the pin for reverse current protection.
To power the attached LaunchPad development kit from the on-board LDO of the TPS281C30EVM, connect the jumper J12. Note that this feeds the output of the 3.3-V LDO on the TPS281C30EVM into the 3.3-V rail on the LaunchPad development kit . If there is another power supply trying to power the LaunchPad development kit (such as the integrated USB power on the LaunchPad development kit itself), this can potentially cause issues with the separate power sources fighting for contention.
Jumpers J6 through J8 are used to manually configure the control signals going into the TPS281C30. When using a microcontroller to control these signals, these jumpers must be unpopulated to allow for the microcontroller to drive them high or low.
For correct and accurate current sense, please configure jumper J14 to use either potentiometer or fixed resistor. The maximum voltage out on the SNS pin is clamped to VSNSFH internally, so there is no need for external clamp.