SLVUBI1 May   2021

 

  1.   Trademarks
  2. 1TPS7H4002EVM-CVAL Overview
    1. 1.1 Features
    2. 1.2 Applications
  3. 2TPS7H4002EVM-CVAL Default Configuration
  4. 3TPS7H4002EVM-CVAL Initial Setup
  5. 4TPS7H4002EVM-CVAL Testing
    1. 4.1 Output Voltage Regulation
    2. 4.2 Output Voltage Ripple
    3. 4.3 Soft Start-up
    4. 4.4 Transient Response to Positive/Negative Load Step (0 A to 3A to 0A)
    5. 4.5 Input Voltage Ripple
    6. 4.6 Loop Frequency Response
    7. 4.7 Current Limiting
  6. 5TPS7H4002EVM-CVAL EVM Schematic
  7. 6TPS7H4002EVM-CVAL Bill of Materials (BOM)
  8. 7Board Layout

3 TPS7H4002EVM-CVAL Initial Setup

This section provides the test instruments required and the connections to the EVM.

  1. Input DC power supply
    1. Set for 5-V DC, 3-A current limit.
    2. Connect the positive output of the DC supply to connector J2 (PVIN) and the negative terminal of the supply to connector J5 for ground.
      Note: For more precise measurements, eliminating the IR voltage drop in the input cables is achieved by using a power supply source with sensing ports and connecting between TP6 to PVIN and TP23 to GND.
  2. DC electronic load
    1. Connect the positive DC input to connector J8 (VOUT) using a 16-AWG wire.
      Note: Wire to the e-load should include at least some part in which the wire gauge can be strapped by the oscilloscope current probe. This will eliminate the need for a setup change to when making transient measurements.
    2. Connect the negative DC input of e-load to connector J7 (GND) using a 16-AWG wire.
    3. Connect voltage monitoring sensing ports of e-load across test points TP17 (VOUT) and TP26 (GND). A voltage meter can be used to monitor this voltage also.
  3. Oscilloscope
    1. CH1 - Connect the voltage scope probe to scope probe test point J4 (PH) to monitor the phase node. DC coupled, Full BW, 2 V/div, Rising Edge Trigger at 0.5 V.
    2. CH2 - Connect voltage scope probe to scope probe test point J9 (VOUT) to monitor the output voltage. AC coupled, BW = 20 MHz, 10 mV/div.
    3. CH3 - Connect current scope probe to monitor current through wire connecting J8 (VOUT) and e-load. 5 A/div
      Note: Only required for transient load testing
Table 3-1 Summary of Connections
Reference Designator Silkscreen Function
J2,

J5

 PVIN Input power: J2 = 5 V, J5 = GND (Vsupply)
J8,

J7

 VOUT Output current: J8 = VOUT J7 = GND, pin 2 = VOUT ≈ 1 V (e-load)
J6 PH4 Phase switching node scope probe test point (Scope CH-1)
J9 VOUT VOUT scope probe test point (Scope CH-2)
TP17 VOUT VOUT test point (e-load monitor)
TP6 PVIN PVIN test point (Vsupply_sense)
TP18, TP23 GND GND test points ( e-load monitor, Vsupply_sense)