Electronics > Projects, Designs, and Technical Stuff
DIY Modular Test Equipment Project
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void_error:
Looks like having two current ranges for the DC Load is pointless but I might keep the range switching for voltage measurement just to get better resolution at lower input voltages.
I settled for 2A & 50V per module.
Minimum current will depend on the minimum output voltage of the DAC and the offset of the op amps but it will go down to 1mA.
void_error:
I did mention I found pin-compatible ADCs and DACs from TI & AD.
Here's a small list. These are the parts available at Farnell, and there's also a LT part I found.

* ADC

* 12bit

* ADS7816
* LTC1860
* 16bit

* ADS8320
* ADS8325
* ADS8326
* AD7683
* AD7684
* DAC

* 16bit

* AD5662
* DAC8501
* DAC8531
* DAC8551
void_error:
Had an idea for an OPP (Over Power Protection) circuit. That means I don't have to settle for 50V & 2A but an upper power limit while keeping a maximum voltage limit.
One way to achieve this is to set the threshold for the OVP (Over Voltage Protection) comparator based on the set current determined by the DAC output voltage. An op amp should do the trick. Time to play with LTspice.
prasimix:
I don't see an OPP as critical to deserve dedicated circuit and not be limited/calculated by MCU or you want response time in microseconds range? Of course if you have dedicated OVP circuit than suggested method make sense when you are in CC mode, isn't it? For CV mode you have to take into account max. current.
void_error:
If there is a MCU then there won't be a dedicated OPP circuit but since there'll also be a non-MCU version on the same board I thought I'd design that in so it's harder to blow the MOSFETs up.
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