TIDT316 December   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Considerations
    3. 1.3 Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency Graph
    2. 2.2 Loss Graph
    3. 2.3 Load Regulation
    4. 2.4 Line Regulation
    5. 2.5 Thermal Images
      1. 2.5.1 8-V Input Voltage
      2. 2.5.2 12-V Input Voltage
      3. 2.5.3 18-V Input Voltage
      4. 2.5.4 Conclusion
    6. 2.6 Bode Plots
      1. 2.6.1 5.2-V Input Voltage (Board Input, 5.0 V at Power Stage)
      2. 2.6.2 12-V Input Voltage
      3. 2.6.3 18-V Input Voltage
  6. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 Switchnode (SW) to GND
        1. 3.1.1.1 8-V Input Voltage
        2. 3.1.1.2 12-V Input Voltage
        3. 3.1.1.3 18-V Input Voltage
      2. 3.1.2 Diode D1 (Referenced to VOUT)
        1. 3.1.2.1 8-V Input Voltage
        2. 3.1.2.2 12-V Input Voltage
        3. 3.1.2.3 18-V Input Voltage
    2. 3.2 Output Voltage Ripple
    3. 3.3 Input Voltage Ripple (AC-Coupled)
      1. 3.3.1 Board Input
      2. 3.3.2 Power Stage Input
    4. 3.4 Load Transients
      1. 3.4.1 8-V Input Voltage
      2. 3.4.2 12-V Input Voltage
      3. 3.4.3 18-V Input Voltage
    5. 3.5 Start-Up Sequence
      1. 3.5.1 8-V Input Voltage
      2. 3.5.2 12-V Input Voltage
      3. 3.5.3 18-V Input Voltage
    6. 3.6 Shutdown Sequence
      1. 3.6.1 8-V Input Voltage
      2. 3.6.2 12-V Input Voltage
      3. 3.6.3 18-V Input Voltage
  7.   A Output Ripple Reduction, Output Current Capability, and Dithering Option
    1.     A.1 Output Ripple Reduction by Adding Ceramic Output Capacitors (MLCCs)
      1.      A.1.1 Initial Design
      2.      A.1.2 Adding one 47-µF X7R Ceramic Capacitor, MLCC, 10 V, X7R, 1210
      3.      A.1.3 Adding a Second 47-µF Capacitor (Final Design)
    2.     A.2 Maximum Output Current Capability at Ultra-Low Cold Cranking Using LM5157
    3.     A.3 Dithering Option via Resistor R10
      1.      A.3.1 Enabled
      2.      A.3.2 Disabled

1.2 Considerations

Unless otherwise indicated, all measurements were done with 2-A output current. Resistors were used as load.

For all measurements dithering is disabled, R10 = 0 Ω.

The prototype on the bench showed a switching frequency of 437 kHz.

The ON threshold is 6 V and the OFF threshold is 4.7 V.

For lower output currents, LM51571-Q1 with the same package and the same pin out is more cost-effective.
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