S12 / MagniV Microcontrollers中的主题 Max Current From Ballast Transistor https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Max-Current-From-Ballast-Transistor/m-p/662966#M13989 <HTML><HEAD></HEAD><BODY><P><EM>How much current can the external ballast transistor supply when used in conjunction with the 9S12ZVCA processor BCTL pin?</EM></P></BODY></HTML> Sun, 09 Apr 2017 09:59:54 GMT gordonp 2017-04-09T09:59:54Z Max Current From Ballast Transistor https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Max-Current-From-Ballast-Transistor/m-p/662966#M13989 <HTML><HEAD></HEAD><BODY><P><EM>How much current can the external ballast transistor supply when used in conjunction with the 9S12ZVCA processor BCTL pin?</EM></P></BODY></HTML> Sun, 09 Apr 2017 09:59:54 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Max-Current-From-Ballast-Transistor/m-p/662966#M13989 gordonp 2017-04-09T09:59:54Z Re: Max Current From Ballast Transistor https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Max-Current-From-Ballast-Transistor/m-p/662967#M13990 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>This is not defined, only max current IDDX without the external PNP (see Table E-1 of the RM). If the current exceeds this value, the external PNP is required. BCTL provides the base current of the transistor. The Table E-1 provides minimal base current that can be guaranteed. Then the gain of the transistor controls the maximum available current.</P><P>&nbsp;</P><P>Please refer to <A href="http://www.nxp.com/assets/documents/data/en/application-notes/AN4867.pdf">Hardware Design Guidelines for S12ZVC</A> for more information.</P><P>&nbsp;</P><P>Regards,</P><P>Daniel</P></BODY></HTML> Mon, 10 Apr 2017 21:09:06 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/Max-Current-From-Ballast-Transistor/m-p/662967#M13990 danielmartynek 2017-04-10T21:09:06Z