C2000WARE: C2000 Current Share Feature

Hi ercan.

We don't have dedicated current sharing pins currently in C2000 family with internal current source. However, you can use DAC to support current sharing. 

I will let other expert to comment on if we have collaterals. 

Regards,

Chen

Hi Pawan,

Thank you for the explanation.

I would like to understand the DAC-based ISHARE emulation in a bit more detail.

Let us say I have two converters in parallel, Module 1 (M1) and Module 2 (M2).

My understanding so far is:

• Module 1 measures its own output current with its ADC

• Module 2 also measures its own output current with its ADC

• Then each C2000 generates a DAC output related to its own measured current

• After that, an external V-to-I circuit is used to emulate the ISHARE function

My question is about how these signals are connected between modules.

For example, in a 2-module system:

1. Does the DAC output of Module 1 go only to its own external V-to-I circuit, and the DAC output of Module 2 go only to its own external V-to-I circuit?

2. Then, are the outputs of those V-to-I circuits connected together to a common share bus?

3. And does each module then read that common share bus with an ADC input?

In other words, is the correct architecture something like this?

• M1 current ADC -> M1 control -> M1 DAC -> external V-to-I -> common ISHARE bus

• M2 current ADC -> M2 control -> M2 DAC -> external V-to-I -> common ISHARE bus

• common ISHARE bus -> ADC input of M1 and ADC input of M2

So, to clarify specifically:

• we do not connect DAC output of M1 directly to DAC output of M2, correct?

• and we also do not connect DAC output of one module directly into the DAC pin of the other module, correct?

If possible, could you please share a simple 2-module example showing:

• which C2000 pins are used

• where the DAC output should go

• where the common share-bus voltage should be sensed

• and whether the share bus should be a voltage bus or a current bus after the external circuit

Also, if there is any small reference schematic for 2 paralleled modules using this DAC + V-to-I method, that would be very helpful.

Thank you very much.

Hi Ercan,

Yes, you are correct. The Ishare pin will output a current proportional to the modules output current. The Ishare output from each module is pumped into a common Ishare bus. On this common Ishare bus a resistor is populated to ground. The sum of all the Ishare currents flows through this single resistor. The voltage drop across this resistor is the average current reference for each module. Sample this voltage using ADC and use as reference for control.