Transcription of USB 전류 제한 스위치 - tc-associates.com
1 USB . : Hardik Patel( ). PC USB , .. USB USB . USB. USB .. USB .. USB USB USB. 500mA .. USB 50mA . USB . 500mA .. USB . USB .. USB .. IC USB .. USB .. II , USB (Recent Improvements in USB. current limit switch) KickStart (DLM) .. USB . USB . ( ). USB . Vbus 5V.. Gnd (MIC2004). D+ ( ). D- ( ). 1: USB USB . 1 USB USB USB .. USB (Vbus gnd) (D+ D-) .. USB .. ( : micrel MIC2004) . USB . MIC2004 USB.. MIC2004 .. USB . 2: . 2 . USB . MIC2004 Vin , Vout , Enable Gnd . Vout=Vin-(Ron*Iout) . Ron ON . MIC2004 70mOhm 500mA . USB . 500mA .. Iout =0mA . USB 500mA USB .. 1A . 3 USB .. USB . 500mA .. ( : . USB ) .. 3: USB 1 . Vout .. MIC2000 .. MIC2000 ( : MIC2005) . 4 MIC2005 . CSLEW .. 4: . 5 MIC2005 . Cload =10uF . Enable .. dV/dt . Channel 1 . Enable, Channel 2 Vout, Channel 4 Iout .. I=C*dV/dt dV/dt . Iout = 10uF*dV/dt =. 10uF*5V/730us = .. 50mA . CSLEW .. 6 Cslew MIC2005 .. 25mA . Cslew dV/dt .. =. 50mA. 5: Cslew , Cload = 10uF.. =. 25mA. 6: Cslew ( , Cload = 10uF).. 7 . Cload=940uF Cslew MIC2005.
2 Cslew .. 8 Cload=940uF Cslew MIC2005 . Cslew . 8ms Cslew . dV/dt . 2ms .. 7: Cslew , Cload = 940uF.. 8: Cslew . 9 Cslew . Cslew . 9: Clsew (Rload= ). MIC2004 MIC2005 . , .. MIC2007 . 10 MIC2007 . 2A .. MIC2007 .. Ilimit = CLF( )/Rset( . Ilimit ) . CLF 235 .. Rset=CLF/Ilimit=235 Ilimit . 10: MIC2007. MIC2005 MIC2009 /Fault . 4 MIC2005, 11 MIC2009 . MIC2009 . /Fault . 11: MIC2009. /Fault .. 12 MIC2009 .. Channel 1 Enable, Channel 2 /Fault, Channel 3 Vout, Channel 4 Iout . VIn 3V 2 Amps . lout 3V/(Rdson + ) . On 70mhom . Iout 3/( + ) = 4A . MIC2009 . 2A 2A .. ( 12).. /Fault . Vout . Iout . 12: MIC2009. MIC2000 . IC . 145 145 .. 12 . MIC2009 . 12 IC . = (Vin-Vout)*Iout = (3-Vout)*2A. Vout=2A* ( 12 ). IC ( )*2= . SOT 23 230degC/W . Tj ( ) = 25 ( ) + 230* = 669 . 150 .. MIC2000 70mOhm RDS(on) ( . ). SOT 23-6 MLF . 2A .. USB .. MIC2000. , KickStart, (DLM).
