I have a problem where iam trying to use the LT6110 cable drop compensator with a LT317 Adustable Regulator. Where I do not succeed with the cable drop compensation.
The setup is like in the typical application LT6110 datasheet for the cable/wire drop compensation.
Below are my calculations:
Vdrop=1A *10 Ohm=10V
Vsense= 20m Ohm*1A = 20mV
I have a 10 Ohms resistor in series on line + and a load of 1A.
Rin = Vsense/Iin=20mV/100uA=200 Ohms
Still i do not get any compensation of the wire drop.
Have measured Iout which is apporx 95uA. Also measured the Vref which is when having a load 1.44V but max shall 1.3V.
Can you please help and advise?
The required VLOAD voltage is not listed in the email (only VDROP and ILOAD).
The VDRO limit of an LT6110 is set by the voltage at the IMON pin because VIMON must be less than 5V from the V- voltage of LT6110. In addition, for the highest accuracy the IMON current must in the 90uA to 900uA range and ISET>>IADJ. For above conditions limit the LT6110 and LT317 regulator for ILOAD=1A to a VDROP 3V or less.
The attached LTspice sim shows LT6110 and LT317 for VLOAD=5V and VDROP=3V at LOAD=1A.
LT6110 and LT317 3 30 20.asc
Thanks for the clarification,
I have calculated and see the JPEG below.
I use long Rwire and cacluate my Vimon=25V.
Where my Vreg is 35V and VIN=38V.