Tool/software:
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Vin=12V
Vout=5V
Ven = 4V
load = 3Ω
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Cin1: 22uF x 5 GRM319R61C226ME15
Cin2: 0.1uF x 1 GRM155B31H104KE14D
Cout1: 22uF x 3 GRM319R61C226ME15
Cout2 : 0.1uF x 1 GRM155B31H104KE14D
L:1.5uH 1217AS-H-1R5N
Rfb(bottom):4.7kΩ
Rfb(up):volume+4.7kΩ
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Do you know the cause of undershoot in the Vsw waveform?
I'm using the evaluation board as reference for the layout, but the evaluation board does not appear to have any undershoot.
Also, there is currently no adverse effect from undershoot on either Vin or Vout, but will this undershoot have any adverse effects, such as damage to the IC?
Passive Probe: TPP0201 ... 200MHz
Oscilloscope : TDS2022B ... 200MHz
Vsw↓ -2.5V under shoot!
Vout(AC)↓ Vout(AC) / Vout(DC) = 1% ... no problem
Vin(AC)↓ Vin(AC) / Vin(DC) = 0.7% ... no problem
layout
EVM board Vsw↓
＝＝＝＝ADD====
Vsw Under Shoot Time 3.8ns < 20ns ...no problem
