ridgemao1983
Junior Member level 1
- Joined
- Dec 3, 2009
- Messages
- 18
- Helped
- 0
- Reputation
- 0
- Reaction score
- 0
- Trophy points
- 1,281
- Activity points
- 1,445
The LM27342(buck convertor) datasheet says:
"The recommended input capacitance is 10µF, Make sure to verify if there is any significant change in capacitance at the operating input voltage"
My input voltage is 24v, so I chose an input capacitor rated 10uF/50V. But the capacitor's dc-bias graph shows that its capacitance will reduce 37%(reduce to 6v) at 24v dc bias. Much less than the 10uF input capacitance.
Does it mean I have to choose another capacitor to make sure its capacitance is 10uF at 24v dc-bias(24v input voltage)?
The 10uF/50v capacitor is TDK C5750X7R1H106K(230KB), its capacitance-voltage graph is shown below
"The recommended input capacitance is 10µF, Make sure to verify if there is any significant change in capacitance at the operating input voltage"
My input voltage is 24v, so I chose an input capacitor rated 10uF/50V. But the capacitor's dc-bias graph shows that its capacitance will reduce 37%(reduce to 6v) at 24v dc bias. Much less than the 10uF input capacitance.
Does it mean I have to choose another capacitor to make sure its capacitance is 10uF at 24v dc-bias(24v input voltage)?
The 10uF/50v capacitor is TDK C5750X7R1H106K(230KB), its capacitance-voltage graph is shown below