SLVUBU6A April   2020  – June 2020 TPS274160

 

  1.   TPS274160 Evaluation Module User's Guide
    1.     Trademarks
    2. 1 Introduction
      1. 1.1 Description
      2. 1.2 Applications
      3. 1.3 Features
    3. 2 TPS274160 Schematic
    4. 3 Connection Descriptions
      1. 3.1 Connectors
      2. 3.2 Jumpers
    5. 4 TPS274160 EVM Assembly Drawings and Layout
    6. 5 Variable Resistor for CS and CL
      1. 5.1 Current Sense Resistor
      2. 5.2 Current Limit Resistor
    7. 6 Bill of Materials
  2.   Revision History

5.2 Current Limit Resistor

An external resistor is used to convert a proportional load current into a voltage, which is compared with an internal reference voltage. When the voltage on the CL pin exceeds the reference voltage, the current is clamped.

The inherent current limit (Ilim,nom) is still present when using an external current limit. The smaller one of the internal or external set value decides the actual nominal current limit. If it is decided to not use an external programmable current, tie the CL pin to ground.

Equation 2 is the equation of the current limit resistor.

Equation 2. eq02_slvuao8.gif

R32 is a 2kΩ resistor; R33 is a 1kΩ resistor, and R8 is a 0Ω resistor. Populate/depopulateR8, R32, and R33 to vary CL. When 0Ω, there is no external current limit function, the internal current limit is active.