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Hi sir,
In addition to the CoolMOS, a MOSFET is built in series inside the CoolSET. (Q1 in the attached figure)
At startup, Vcc is charged via primary transformer Lp → CoolMOS → internal diode D1.
At this time, the other MOSFET inside is turned off, which I believe prevents current leakage to the CS pin.
Soft-start is initiated when Vcc exceeds the turn-on threshold, but will Q1 be fully ON from the time of soft start operation?
BR
Yuki Fujioka
Solved! Go to Solution.
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Hi @NXTY_Fujioka ,
Thanks for posting in Infineon community.
In the Vcc voltage and current at startup curve. (ICE5xRxxxxxZ).
At t1, Vcc voltage exceeds the Vcc turn on threshold Vcc_on. IC starts to operate with soft start and Q1 is turned on. t2 onwards output voltage rises close to regulation. Axillary winding starts to charge the Vcc capacitor.
Please feel free to reach out to us if you need further clarification on this topic.
Regards,
Guruprasad A
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Hi @NXTY_Fujioka ,
Thanks for posting in Infineon community.
In the Vcc voltage and current at startup curve. (ICE5xRxxxxxZ).
At t1, Vcc voltage exceeds the Vcc turn on threshold Vcc_on. IC starts to operate with soft start and Q1 is turned on. t2 onwards output voltage rises close to regulation. Axillary winding starts to charge the Vcc capacitor.
Please feel free to reach out to us if you need further clarification on this topic.
Regards,
Guruprasad A
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Hi Guruprasad_A
I understood that Q1 is fully on during soft-start.
Thank you for your answer.
BR
Yuki Fujioka