# About EPWM BLOCK - TI C2000 DC/DC Buck Converter Example

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Burak Caykenari 2020 年 9 月 16 日
コメント済み: Venkatesh Chilapur 2020 年 9 月 18 日
Hello Everyone,
I have basic question about f28379d EPWM block in this example -> (https://www.mathworks.com/help/supportpkg/texasinstrumentsc2000/ug/dc-dc-buck-converter.html)
According to working principle of ADC , We don't make the ADC start of conversion,while pwm transitioning . For this reason ADC start of conversion launchs the conversion before the X(any time) of period.
In buck example with f28379d , and its EPWM block as following:
This is provided via CMPB value. Period is 1000. When counter is equai to CMPB value , ADC will start conversion as you can see at CMPB value.
But I didn't understand how to choose CMPB value as (15+54)/2 ? What are the mean 15 and 54 values ? Where do they come from ?
Can you explain briefly ?
Manythanks.
Burak .

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### 回答 (1 件)

Venkatesh Chilapur 2020 年 9 月 16 日
Hi,
The first factor i.e 15 is related to the ADC SOCx acquisition window. The second factor i.e 54 is time from the end of the S+H window until the ADC results latch in the ADCRESULTx register. Refer the ADC block in the model and the controller TRM for more details. Since we have 2 SOC's configured here, hence the mutiplication factor of 2.
HTH,
Regards,
Venkatesh C
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burak caykenari 2020 年 9 月 18 日
Hi Venkatesh ,
My final question, I'm asking for confirmation :)
'But lets say, you have one SOC in ADC-A module and other in ADC-C, since they are different ADC module, they can run parallel.'
In this time equation is (1000-(15+54)). ?
These informations which you gave was very useful , I really appreciate you .
Manythanks.
Venkatesh Chilapur 2020 年 9 月 18 日
Correct!

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