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[8023-POEP] My response to #86 and their related comments 444,452,253,259,316,120,424

Regardless of what was the status of the above comments, The proposed response is OBE 86 for all of them including 444 and change the response for 86 as follows:

 

Yair Darshan Response:

1. We want to work in terms of Power.

2. We decided that Ipeak/Iport = 0.4/0.35.

    We need to transform this ratio Ki=0.4/0.35 in terms of current ratio to a value in terms of Power ratio Kp=Ppeak/Pclass.

    (See detailed analysis in darshan_3_0108 pages 22 and  23 done for 29.5W/0.72A PD showing  how we got Ki and Kp.

    Now we have to update the numbers for 25.5W/0.6A PD.)

    In this case a Ki=0.4/0.35=1.142857 is transformed to Kp:

    Ki=0.4/0.35=Ipeak/Iclass=

    ={((Vpse-(Vpse^2-4*Rc*Pclass)^0.5)/(2Rch)} / {((Vpse-(Vpse^2-4*Rc*Pclass*Kp)^0.5)/(2Rch)}.

   Solving for Kp, we get Kp=1.114 in order to keep Ki=0.4/0.35.

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PROPOSED ACCEPT IN PRINCIPLE.

1. Table 33-17, p66.  item 7, first row:

    Change to: Peak operating power, Class 0, 3, and Type 1 Class 4 = 14.4 W

2. Table 33-17, p66.  item 7, forth row:

    Change to: Peak operating power, Type 2 Class 4 = 1.114 x Pclass

3. Add the following text to 33.3.7.4:

    Pclass is the average power demand of the PD. Pclass = Vpd x Iport.

    The PD is approximated as constant power load i.e. when the voltage increases Iport decreases to maintain about constant Pclass.

    The PD load behavior may be different then constant power load (e.g. resistor or linear regulator) as long as the power

    demand from the PD is not acceding Pclass for any Vport value.

4. Figure 33-18:

4.1  Change (400/350)xPport_max/Vport to Ppd_peak/Voverload

4.2  Change Pport_max/Vport to Pclass/Vport

4.3  Change Table 33-17 Ppeak to Ppd_peak  (to match with Eq 33-1)

4.4  Add below Figure 33-18 the following text:

      Ppd_peak is defined in Table 33-17 item 7. Voverload is calculated according to Eq 33-1.

 

 

Please review and comment so we can be done with it tomorrow morning.

 

Thanks

 

Yair

 

Darshan Yair
Chief R&D Engineer

Analog Mixed Signal Group

Microsemi Corporation

 

1 Hanagar St., P.O. Box 7220
Neve Ne'eman Industrial Zone
Hod Hasharon 45421, Israel
Tel:  +972-9-775-5100,

Cell: +972-54-4893019
Fax: +972-9-775-5111

 

E-mail: <mailto:ydarshan@xxxxxxxxxxxxx>.