Other Parts Discussed in Thread: LMR38020, , ISO1642
Tool/software:
Hello, I have a system where I have +/36V, +5 rails that are available. I need to create a positive programmable voltage (2 to 32V) and a negative programmable voltage (-2 to -32V) at about 0.5 Amps. Below is the block diagram of how I'm doing this. The DAC voltages are used to modify the set points of the feedback network on the LMR38020. I have tested this circuit in PSPICE for TI and it works but it is messy and complex.
I saw this new LM72880-Q1 buck converter which has an I2C interface to program the output voltage and on the surface it looks like I could replace my existing circuit with 2 LM72880-Q1 ICs for a much simpler cleaner implementation. I've actually been waiting for an IC like this for a long time.
Is there any reason why I couldn't use the LM72880-Q1 in an Inverting Buck Boost Configuration to create my negative voltage? I realize I might have to level translate some of the digital control signals. Thanks for any guidance you can provide.
