Amplifiers for active electronic load

I'm interested in building an adjustable electronic load as per Figure 6 of the apps note here: http://cds.linear.com/docs/en/application-note/an104f.pdf

Which ADI amplifiers would be the best match to replace the LT1210 and LT1006? 

Thanks

Tim

  • Hi Tim,

    For the LT1006, I think the ADA4638-1 is an excellent part as replacement. ADA4638-1 is a high voltage, high precision, and zero-drift amplifier with rail-to-rail output. It has lower input offset voltage and drift, lower offset current, and higher open-loop gain. ADA4077-2 also has close specifications to LT1006, but comes as a dual.

    For the LT1210, ADI currently has no amplifier with a current drive of 1A. However, for this application, I am not sure if A1 needs that much current to drive Q1. AD810 and AD811 are high speed amplifiers with slew rates of 1000V/us and 2500V/us, respectively. They can drive large capacitive loads with some external compensating resistors/capacitors. AD817 and AD825 are both high speed amps with high capacitive load drive, but with lower slew rates.

    I hope this helps.

    Best regards,

    Neil

  • Hi Tim,

    I build this active load :-)

    The LT1006 kan be replaced whit any good precision opamp like the ADA4638-1.

    Do NOT try to replace the LT1210!

    You can have al look @ this website: http://www.circuitsonline.net/forum/view/105032/1/active+load

    Klik on the links, and you wil see pictures i made of building this active load.

    It needs verry short wiring!

    Also the connection to your powersupply needs to be verry short if you do dynamic testing

    of your powersupply.

    I used a LM10 as a reference generator with a 10 turn pot and a dial to set the current level.

    Schematic: http://www.bramcam.nl/AL/JW-BK-DLT-01.JPG

    This active load is a beauty for testing powersupply's with fast signals.

    Yust order some sampels for the LT1210 @ www.lineair.com

    Kind regarts,

    Bram

  • Hi all

    I need your urgent help in understanding the failure of my circuit.

    Please find the attached Control Loop which i have used with Mosfet SiE844DF, it worked successfully. 

    But when i have changed this Fet to SiDR220DP, circuit is failing.

    Please help me to tune this circuit, where i am going wrong ?

    Kindly help as soon as possible.

  • Hi all

     

    I need your urgent help in understanding the failure of my circuit.

     

    Please find the attached Control Loop which i have used with Mosfet SiE844DF, it worked successfully. 

    But when i have changed this Fet to SiDR220DP, circuit is failing.

     

    Please help me to tune this circuit, where i am going wrong ?

     

    Kindly help as soon as possible.

  • 0
    •  Analog Employees 
    on Aug 2, 2018 4:49 PM over 2 years ago
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

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