switching frequency of a FET?

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bigfarmerdave

New Member

• Apr 8, 2009

• #1

I am going to be switching a BST4140N smart high side FET on/off to control some LEDs. My question is, how do I know how fast I can turn my FET on and off? Do I just do the following .....

1/(turn on time + turn off time + slew rate to turn on + slew rate to turn off) to get the switching frequency?

 

S

smanches

New Member

• Apr 8, 2009

• #2

Post the datasheet.

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Apr 8, 2009

• #3

What are you trying to do?, why does the switching frequency make any difference?.

 

M

mneary

New Member

• Apr 8, 2009

• #4

smanches said:

Post the datasheet.

Click to expand...

Post the correct part number.

 

Mikebits

Well-Known Member

• Apr 9, 2009

• #5

I can not imagine any LED being faster than a FET. I would say not worry about it.

The speed of your LED is the limiting factor...

 

Last edited: Apr 9, 2009