TIDT281 June   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 Graphs
      1. 2.1.1 24-V Output Voltage
      2. 2.1.2 48-V Output Voltage
    2. 2.2 Loss Graphs
      1. 2.2.1 24-V Output Voltage
      2. 2.2.2 48-V Output Voltage
    3. 2.3 Load Regulation
      1. 2.3.1 24-V Output Voltage
      2. 2.3.2 48-V Output Voltage
    4. 2.4 Line Regulation
      1. 2.4.1 24-V Output Voltage
      2. 2.4.2 48-V Output Voltage
    5. 2.5 Thermal Images
    6. 2.6 Bode Plots
      1. 2.6.1 60-V Input Voltage and 24-V Output Voltage
      2. 2.6.2 30-V Input Voltage and 48-V Output Voltage
      3. 2.6.3 Loop Variants
  6. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 24-V Output Voltage, 30-V Input Voltage (Duty Cycle 80%)
        1. 3.1.1.1 Diode D1
        2. 3.1.1.2 Transistor Q2
          1. 3.1.1.2.1 Drain - GND
          2. 3.1.1.2.2 Gate - GND
        3. 3.1.1.3 Diode D2
        4. 3.1.1.4 Transistor Q1
          1. 3.1.1.4.1 Source - VIN
          2. 3.1.1.4.2 Gate - Source
      2. 3.1.2 24-V Output Voltage; 60-V Input Voltage
        1. 3.1.2.1 Diode D2
        2. 3.1.2.2 Transistor Q1
          1. 3.1.2.2.1 Source - VIN
          2. 3.1.2.2.2 Gate-Source
      3. 3.1.3 48-V Output Voltage; 30-V Input Voltage (Maximum Stress)
        1. 3.1.3.1 Diode D1
        2. 3.1.3.2 Transistor Q2
          1. 3.1.3.2.1 Drain-GND
          2. 3.1.3.2.2 Gate-GND
        3. 3.1.3.3 Diode D2
        4. 3.1.3.4 Transistor Q1
          1. 3.1.3.4.1 Source - VIN
          2. 3.1.3.4.2 Gate - Source
      4. 3.1.4 48-V Output Voltage; 60-V Input Voltage
        1. 3.1.4.1 Diode D1
        2. 3.1.4.2 Transistor Q2
          1. 3.1.4.2.1 Drain - GND
          2. 3.1.4.2.2 Gate - GND
        3. 3.1.4.3 Diode D2
        4. 3.1.4.4 Transistor Q1
          1. 3.1.4.4.1 Source - VIN
          2. 3.1.4.4.2 Gate - Source
    2. 3.2 Output Voltage Ripple
      1. 3.2.1 24-V Output Voltage
      2. 3.2.2 48-V Output Voltage
    3. 3.3 Input Voltage Ripple
      1. 3.3.1 24-V Output Voltage
      2. 3.3.2 48-V Output Voltage
    4. 3.4 Load Transients
      1. 3.4.1 24-V Output Voltage
        1. 3.4.1.1 30-V Input Voltage
        2. 3.4.1.2 60-V Input Voltage
      2. 3.4.2 48-V Output Voltage
        1. 3.4.2.1 30-V Input Voltage
        2. 3.4.2.2 60-V Input Voltage
    5. 3.5 Start-Up Sequence
      1. 3.5.1 24-V Output Voltage
        1. 3.5.1.1 30-V Input Voltage
        2. 3.5.1.2 60-V Input Voltage
      2. 3.5.2 48-V Output Voltage
        1. 3.5.2.1 30-V Input Voltage
        2. 3.5.2.2 60-V Input Voltage
    6. 3.6 Shutdown Sequence
      1. 3.6.1 24-V Output Voltage
        1. 3.6.1.1 30-V Input Voltage
        2. 3.6.1.2 60-V Input Voltage
      2. 3.6.2 48-V Output Voltage
        1. 3.6.2.1 30-V Input Voltage
        2. 3.6.2.2 60-V Input Voltage

3.4.2.1 30-V Input Voltage

Note: This voltage combination is the worst case in boost mode due to Right Half-Plane Zero (RHPZ).
GUID-20220509-SS0I-BTCL-S2HS-PDRSPVBWNGGM-low.jpg

Ch1 ⇒ VOUT

1 V / div


                                
Ch2 ⇒
                                        IOUT

                                
200 mA / div

                                

                                
2 ms / div

                                
20-MHz
                                    bandwidth

                            		
                        

                    

            

                
            Figure 3-32 Transient at 30 VIN
                    and 48 VOUT