TPS54383, TPS54386
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SLUS774B–AUGUST 2007–REVISED OCTOBER 2007
Example 2: 24-V to 12-V and 24-V to 5-V
For a higher input voltage, both a snubber and bootstrap resistors are added to reduce ringing on the switch
node and a 30 V schottky diode is selected. A higher resistance feedback network is chosen for the 12 V output
to reduce the feedback current.
+
+
Figure 46. 24-V to 12-V and 24-V to 5-V Using the TPS54383
V
= 24 V
= 2 A
IN
V
= 24 V
= 2 A
IN
I
OUT
I
OUT
V
V
OUT
OUT
(5 V/div)
(5 V/div)
T − Time − 10 ns / div
T − Time − 10 ns / div
Figure 47. Switch Node Ringing Without Snubber and
Boost Resistor
Figure 48. Switch Node Ringeing With Snubber and
Boost Resistor
42
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