TIDT195 September   2020  – MONTH 

 

  1.   Description
  2. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
  3. 2Testing and Results
    1. 2.1 Thermal Images
    2. 2.2 Efficiency and Power Dissipation Graphs
    3. 2.3 Efficiency and Power Dissipation Data
    4. 2.4 Voltage Regulation
  4. 3Waveforms
    1. 3.1 Start-up
    2. 3.2 Switch Node
    3. 3.3 Output Voltage Ripple
    4. 3.4 Load Transients
    5. 3.5 Short-Circuit Recovery Response

3.3 Output Voltage Ripple

The output ripple voltage (AC coupled) is shown in the following image. The input voltage is 50 V and the 12-V output is loaded to 400 mA.

GUID-20200813-CA0I-RJ3G-R020-1J7CKKCQP58L-low.jpgFigure 3-14 Output Voltage Ripple (AC Coupled) (VOUT: 50 mV/div, 100 μs/div)

The output ripple voltage (AC coupled and scope persistence on) is shown in the following image. The input voltage is 50 V and the 12-V output is loaded to 400 mA. This shows the effects of frequency dithering and valley switching on the switch node waveform.

GUID-20200813-CA0I-ZKWJ-SQ21-CFGMC6DV50FD-low.jpgFigure 3-15 Output Voltage Ripple (AC Coupled) (VOUT: 50 mV/div, 20 μs/div)

The output ripple voltage (AC coupled) is shown in the following image. The input voltage is 150 V and the 12-V output is loaded to 400 mA.

GUID-20200813-CA0I-KWPL-WVK2-CNDCZLH65HP4-low.jpgFigure 3-16 Output Voltage Ripple (AC Coupled) (VOUT: 50 mV/div, 100 μs/div).