Current sensing and lowering voltage thresholds in SMPS

[CMOS]

Current Sensing in SMPS

Hi,
I want to construct a CC-CV SMPS using TOPSWITCH similar to one shown in **broken link removed** (Figure 11-Cellular Phone Adapter). There is also an Design Idea numbered DI-8 from Powerint for same thing.
The effeciency of given circuit is 60% and I want it to be more than 80%.
There is one point in DI-8 mentioning "Efficiency can be significantly improved by employing current sense techniques with lower voltage thresholds.". What does this mean. Can anyone clarify this?

 

[satya_vijayawada]

Re: Current Sensing in SMPS

hai

increase the R2(100K 1W) resister value, some 120K or 150K 1W

and also use tripple insulated copper wire in transformer.

and which type of core(EI or EE series) u can used ???
send the full details

satya

 

[CMOS]

Re: Current Sensing in SMPS

I haven't made the circuit yet. The effeciency is given in the design note.
You can find full details in this pdf file **broken link removed**

The schematic from file is attached.

My question is how to increase the effeceincy? The above given point mentions something about that but I am not getting what do they mean by "current sense techniques with lower voltage thresholds".

And how will R2 affect effeciency?

Thanks

 

[CMOS]

Re: Current Sensing in SMPS

No one?