Lovoltech jfet LU1014D complete curves

mos57 · 29th May 2006, 09:22 AM

Hi, everyone.
Seems to me that the LU1014D not are linear up few volts in the output characteristics.The maker show this characteristics in the region 0-5 volt, 0-50 ampere and that are ok, but further?
Is there someone that have measured or plotted the output curves in the complete range 0-24 V, 0-50 A or so?

Francesco.

Nelson Pass · 30th May 2006, 05:14 PM

The area above 5 volts is well described, but the interesting
area is down around 2-4 volts, where you see some triode-like
curvature. Unfortunately, this portion of the curve varies
more between devices than elsewhere.

mos57 · 31st May 2006, 07:59 AM

Hi Nelson, where are described the I/V curves over 5 volts? I not read in the datasheet. Have you drawn the I/V characteristics in the region 0-1 A; 0-24 V? In my application the voltage rail is about 16 V and the bias current about 500 mA. At very low level the sound in ok, but when the signal raising, i hear more distortion (a sort of spikes). So i have thougth that over 5 V the curves become as conventional mosfet or BJT. Another problem is its input capacitor that limit the high frequencies heavily. In your application (ZEN 9, F3) the two problem are resolved brilliantly with cascode operation,but in my case it isn't foresaw. In audio application the lovoltech JFET is usable under 5 V only? This seems an enormous limit for audio power application.
We must waiting for future devices?

Best regards, Francesco

Nelson Pass · 31st May 2006, 06:13 PM

You can download the full data sheet from Lovoltech, and
you'll find that above 5 volts or so they look a lot like
Mosfets in terms of the curvature.

mos57 · 1st June 2006, 03:43 PM

Hi Nelson you wrote

Quote:

You can download the full data sheet from Lovoltech,

I have the lovoltech datasheet, but i not able to find curvatures over 5 V, excuse me.
i will post the URL of the datasheet in question.

http://www.lovoltech.com/pdf/LU1014D.pdf

Thanks, Francesco.

Nelson Pass · 1st June 2006, 05:02 PM

Figures 6 and 8 of the data sheet are the curves to which I
was referring. They aren't the best, but there they are.

mos57 · 1st June 2006, 06:23 PM

These curvatures are partially. they finished to Vds=5 V, while the max device's Vds voltage is 24 V. Now i want that you look to the follower figures and tell me what you think about its. For my application i search one of this type.

Francesco.

mos57 · 1st June 2006, 07:00 PM

Another figure

29th May 2006, 09:22 AM	#1
mos57 diyAudio Member Join Date: Apr 2006 Location: Catanzaro - Calabria	Lovoltech jfet LU1014D complete curves Hi, everyone. Seems to me that the LU1014D not are linear up few volts in the output characteristics.The maker show this characteristics in the region 0-5 volt, 0-50 ampere and that are ok, but further? Is there someone that have measured or plotted the output curves in the complete range 0-24 V, 0-50 A or so? Francesco.

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30th May 2006, 05:14 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	The area above 5 volts is well described, but the interesting area is down around 2-4 volts, where you see some triode-like curvature. Unfortunately, this portion of the curve varies more between devices than elsewhere.

31st May 2006, 07:59 AM	#3
mos57 diyAudio Member Join Date: Apr 2006 Location: Catanzaro - Calabria	Hi Nelson, where are described the I/V curves over 5 volts? I not read in the datasheet. Have you drawn the I/V characteristics in the region 0-1 A; 0-24 V? In my application the voltage rail is about 16 V and the bias current about 500 mA. At very low level the sound in ok, but when the signal raising, i hear more distortion (a sort of spikes). So i have thougth that over 5 V the curves become as conventional mosfet or BJT. Another problem is its input capacitor that limit the high frequencies heavily. In your application (ZEN 9, F3) the two problem are resolved brilliantly with cascode operation,but in my case it isn't foresaw. In audio application the lovoltech JFET is usable under 5 V only? This seems an enormous limit for audio power application. We must waiting for future devices? Best regards, Francesco

31st May 2006, 06:13 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	You can download the full data sheet from Lovoltech, and you'll find that above 5 volts or so they look a lot like Mosfets in terms of the curvature.

1st June 2006, 05:02 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	Figures 6 and 8 of the data sheet are the curves to which I was referring. They aren't the best, but there they are.

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