LM25069: Gate capacitor for slew rate control

K. Sasaki14

Part Number: LM25069

Can we put capacitor on the GATE pin for reducing inrush and Vout slew rate control?

Please let me know if you have any concern.

I think this is no problem as a device operation, and it depends on application.

I think concern is the timing of FET off. We should use external dV/dt circuit in App note "SLVA673A" if there is any problem about turn-off control.

Is the gate capacitor no problem if there is no concern as an application?

Best Regards,
Kohei Sasaki

over 7 years ago

0 Rakesh over 7 years ago

TI__Guru** 105361 points

Hi Sasaki,

The external dV/dt circuit mentioned in Figure-6 of SLVA673A document can be used safely with out any concern. Can you share your application details and system specifications.

Best Regards,
Rakesh

0 K. Sasaki14 over 7 years ago in reply to Rakesh

Guru 10200 points

Rakesh-san,

LM25069 is used for 12V power line.
GATE pin has 22nF capacitor to GND and connected to FET through 10 ohm resistor.

We would like to know two points, is there any problem as device operation? and is there any concern about on/off control?

Best Regards,
Kohei Sasaki

0 Rakesh over 7 years ago in reply to K. Sasaki14

TI__Guru** 105361 points

Hi Sasaki,

22nF would not be a problem for device operation and also for ON/OFF control.
Beyond that I recommend to go for external dV/dT circuit.

Best Regards,
Rakesh

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LM25069: Gate capacitor for slew rate control