Hello,
I am looking at the PMP7006 power reference design and wanted to know what is the minimum input current at 15V input, 15V and 20 mA output for this design?
http://www.ti.com/tool/pmp7006
Thanks!
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Hello,
I am looking at the PMP7006 power reference design and wanted to know what is the minimum input current at 15V input, 15V and 20 mA output for this design?
http://www.ti.com/tool/pmp7006
Thanks!
Hello Austin,
I am looking into this, and should get back to you by the end of the day.
One thing I did want to note is that if you look at the Test Report for this reference design, the output voltage at 20mA is more like 14.2V (From Table 4 in the test report: http://www.ti.com/lit/ug/sllu161/sllu161.pdf )
Is this an acceptable variance for the end application?
Best,
Michael
Austin,
From the PMP7006 test report I have the following information:
Efficiency at 20mA = 54% from Figure 3
Load Regulation at 20mA = 14.2V from Figure 4
Based on this information we can say that that Pout = 14.2V * 0.02A = 284mW (if we assume 15V output then Pout = 300 mW conservatively)
From Efficiency calculation 0.54 = 300mW/Ptot
Therefore Ptot = 556mW and given Vin = 15V then Ii(AVE) = 37mA
The MC34063 switching regulator has a duty cycle of approximately 86% when normally operating (not in overcurrent mode)
Based on this, the peak input current necessary would be 37mA/0.86 = 43mA
So overall the peak input current would need to be 43mA while the average would need to be 37mA.
Hope this helps!
Best,
Michael