TIDT286 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 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 0.5-A Output Current
      2. 2.5.2 1-A Output Current
      3. 2.5.3 1.5-A Output Current
      4. 2.5.4 2-A Output Current
      5. 2.5.5 Pulsed Ouput Current
    6. 2.6 Bode Plots
      1. 2.6.1 6-V Input Voltage
      2. 2.6.2 12-V Input Voltage
  6. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 Transistor Q1
        1. 3.1.1.1 Drain - Source
        2. 3.1.1.2 Gate - Source
      2. 3.1.2 Diode D3
    2. 3.2 Input Voltage Ripple
      1. 3.2.1 20-MHz Bandwidth
      2. 3.2.2 Full Bandwidth
    3. 3.3 Output Voltage Ripple
    4. 3.4 Load Transients
      1. 3.4.1 Switching Load From 1 A to 2 A
      2. 3.4.2 Switching Load From 0.2 A to 2 A
        1. 3.4.2.1 50% Duty Cycle
        2. 3.4.2.2 Low Duty Cycle (TON = 3 ms; TOFF = 30 ms)
    5. 3.5 Start-Up Sequence
    6. 3.6 Shutdown Sequence

3.4.2.2 Low Duty Cycle (TON = 3 ms; TOFF = 30 ms)

The requested custom load transient was rebuilt with electronic load HP6060B, see Figure 3-10.

GUID-20220524-SS0I-CL41-SKPD-CRFND00J9SFR-low.jpg Figure 3-10 Requested Custom Load Transient

In Figure 3-11 the output voltage waveform has a deviation of about 1% with bandwidth setting of 10 kHz.

GUID-20220524-SS0I-Z0DM-ZFLM-XNT6GTGTM43L-low.png

Ch1 ⇒ VOUT

50 mV / div (AC)

10-kHz bandwidth


                                
Ch2 ⇒
                                        IOUT

                                
1 A / div

                                
20-MHz
                                    bandwidth

                                

                                
10 ms / div

                            		
                        

                    

            

                
            Figure 3-11 Load Transient 0.2 A to 2 A,
                    Custom Waveform

            
The waveforms in Figure 3-12 are the same waveforms as in Figure 3-11 only with a different time scale.

            

                        

                            
                                

                                    GUID-20220524-SS0I-NNMD-WF2S-1ST7TCZTWPSL-low.png
                                

                            		
                            
                                
Ch1 ⇒
                                        VOUT

                                
50 mV / div
                                    (AC)

                                
10-kHz
                                    bandwidth

                                

                                
Ch2 ⇒
                                        IOUT

                                
1 A / div

                                
20-MHz
                                    bandwidth

                                

                                
400 µs / div

                            		
                        

                    

            

                
            Figure 3-12 Load Transient 0.2 A to 2 A,
                    Extracted Pulse 3 ms