SLVUBX8B October   2020  – December 2021 TPS2661

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 EVM Features
    2. 1.2 EVM Applications
  3. 2Description
  4. 3Schematic
  5. 4General Configurations
    1. 4.1 Physical Access
    2. 4.2 Test Equipment and Setup
      1. 4.2.1 Power Supplies
      2. 4.2.2 Meters
      3. 4.2.3 Oscilloscope
      4. 4.2.4 Loads
  6. 5Test Setup and Procedures
    1. 5.1 Overload Protection Test
    2. 5.2 Output Short-Circuit Test
    3. 5.3 Input Undervoltage Protection Test
    4. 5.4 Output Undervoltage Protection Test
    5. 5.5 Output Overvoltage Protection Test
    6. 5.6 TPS26612 Overload Protection Test
    7. 5.7 Current Limiting for VIN < –Vs
    8. 5.8 Surge Protection Test (Current Input, CH1)
    9. 5.9 Surge Protection Test (Analog Output, CH2)
  7. 6EVAL Board Assembly Drawings and Layout Guidelines
    1. 6.1 PCB Drawings
  8. 7Bill Of Materials (BoM)
  9. 8Revision History

5.7 Current Limiting for VIN < –Vs

Use the following instructions to evaluate current limit behavior for input voltages lower than negative bias supply (–Vs):

  1. Replace the TPS26610 with TPS26613 in U1 position
  2. The current limiting behavior is independent of MODE setting for VIN < –Vs, so jumper setting J4 can be in any position
  3. Open jumper J6
  4. Connect 600 Ω at terminal J3
  5. Set dual polarity regulated power supply to +20 V : 0 V : –20 V and apply the power at connector J2
  6. Apply a voltage of –24 V at I_IN_1
  7. The device limits the current to 32 mA for approximately 100 ms and then auto retries for every 800 ms

Figure 5-12 shows current limit behavior captured on the TPS2661EVM with TPS26613 in U1 position.

Figure 5-12 Current Limit Behavior of TPS26613 for VIN < –Vs
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