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LM25066: Design calculator question

Allen yang
Expert 1015 points
Part Number: LM25066


Hi Team,

1. "dv/dt rate on Vout" suggested to used 4V/mS ?

2. "Target Fault Time" suggested to used ? mS

3. "actual SS capacitance" is Fig.2 "Cdv/dt" ?

4. "Actual Timer Capacitance (pick one smaller than CT,CALC) " is Fig.2 "CTIMER" ?

5. What does the time and W in the red circle mean? Fig. 3  

Fig. 1

Fig.2

Fig. 3

  • 0
    TI__Mastermind 40950 points

    Hi Allen,

    Thanks for reaching out. Please see the responses below.

    1. "dv/dt rate on Vout" suggested to used 4V/mS ? Avishek: No, it's selected by the user. 

    2. "Target Fault Time" suggested to used ? mS Avishek: No, it's selected by the user. How much is the fault timer duration required?

    3. "actual SS capacitance" is Fig.2 "Cdv/dt" ? Avishek: Yes

    4. "Actual Timer Capacitance (pick one smaller than CT,CALC) " is Fig.2 "CTIMER" ? Avishek: Yes

    5. What does the time and W in the red circle mean? Fig. 3  Avishek: Power loss on the MOSFET during startup. 

  • 0
    TI__Mastermind 40950 points

    Hi Allen,

    Thanks for reaching out. Please see the responses below.

    1. "dv/dt rate on Vout" suggested to used 4V/mS ? Avishek: No, it's selected by the user. 

    2. "Target Fault Time" suggested to used ? mS Avishek: No, it's selected by the user. How much is the fault timer duration required?

    3. "actual SS capacitance" is Fig.2 "Cdv/dt" ? Avishek: Yes

    4. "Actual Timer Capacitance (pick one smaller than CT,CALC) " is Fig.2 "CTIMER" ? Avishek: Yes

    5. What does the time and W in the red circle mean? Fig. 3  Avishek: Power loss on the MOSFET during startup. 

  • +1
    TI__Mastermind 40950 points

    Hi Allen,

    Thanks for reaching out. Please see the responses below.

    1. "dv/dt rate on Vout" suggested to used 4V/mS ? Avishek: No, it's selected by the user. 

    2. "Target Fault Time" suggested to used ? mS Avishek: No, it's selected by the user. How much is the fault timer duration required?

    3. "actual SS capacitance" is Fig.2 "Cdv/dt" ? Avishek: Yes

    4. "Actual Timer Capacitance (pick one smaller than CT,CALC) " is Fig.2 "CTIMER" ? Avishek: Yes

    5. What does the time and W in the red circle mean? Fig. 3  Avishek: Power loss on the MOSFET during startup.