SLVUCR4 December   2023 TPS281C100

 

  1.   1
  2.   Description
  3.   3
  4.   Features
  5.   5
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 BoosterPack Plug-in Module Operation
    2. 2.2 Connection Descriptions
    3. 2.3 Best Practices
  9. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 PCB Layouts
    3. 3.3 Bill of Materials
  10. 4Additional Information
    1.     Trademarks

2.1 BoosterPack Plug-in Module Operation

While the TPS281C100EVM 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 (J15, J16) to enable easy interface with a Texas Instruments microcontroller. Additionally, by populating jumper J14 the user has the ability to power the underlying LaunchPad™ development kit through the integrated 3.3-V LDO on the TPS281C100EVM. A list of pins connected to the BoosterPack plug-in module header can be seen below in Table 3-1:

Table 2-1 Connected BoosterPack Plug-in Module Header Pins on TPS281C100EVM
BoosterPack Plug-in Module PinFunctionNote
13.3-V power railDisconnect J14 if powering LaunchPad development kit through USB.
5FLT pin used to detect faultsOpen drain input. Pullup source can be controlled using jumper J12.
6Current sense output from IC

Current sense resistor is R12

38Configure DIAG_ENMake sure J7 is not populated if using microcontroller output.
39Configure EN_ICMake sure J6 is not populated if using microcontroller output.
40Configure OL_ICMake 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 TPS281C100EVM, connect the jumper J14. Note that this feeds the output of the 3.3-V LDO on the TPS281C100EVM 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 TPS281C100. 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, the maximum voltage out on the SNS pin is clamped to VSNSFH internally, so there is no need for external clamp.