1. Home
  2. Electronics Design
  3. gate driver rise/fall time comparisons

gate driver rise/fall time comparisons

Hi,

How does transformer gate driving compare to IC gate driving for rise/fall times?

Also the HIP4081 has a 2.5Amp gate drive current and a 10ns (typical) rise/fall time. Its spec'd to drive 1000pF at 1MHz with rise and fall times of 10ns.

The TC4452 has a 12Amp gate drive current and a 21ns rise and fall time with a 10000pF load.

Is there something inherently faster about the HIP4081 over the TC4452 with the smaller capacitive load, or will the TC4452 switch as fast or faster than the HIP4081 with the same 1000pF load?

Are there any other ways of switching a 600Volt/10amp fullbridge that would give lower switching times?

cheers, Jamie

Reply to
Jamie Morken
Loading thread data ...

I = CdV/dt

dt depends on current and load capacitance.

The less capacitance, the more current, the faster the charge.

HIP4081

2.5A = 1000pf * dV/10nS

dV = 25

TC4452

12A = 10000pf * dV/21nS

dV = 25.2

But if the TC4452 had a 1000pf load...

12A = 1000pf * 25/dt

dt = 2nS !!

TC4452 wins..(if I did the math right..)

D from BC

Reply to
D from BC

IRF has a nice app note on gate charge design.

formatting link

Look for AN-944

Cheers

Reply to
Martin Riddle

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.