link to page 10 link to page 10 link to page 10 LTC4361-1/LTC4361-2 APPLICATIONS INFORMATION WALL ADAPTOR MOBILE AC/DC RIN L DEVICE IN IN ICABLE VIN C 10V/DIV + OUT CABLE LOAD ICABLE 20A/DIV 436112 F04a 5µs/DIV 436112 F04b RIN = 150mΩ, LIN = 0.7µH LOAD = 10Ω, COUT = 10µF Figure 4. 20V Hot-Plug into a 10µF Capacitor WALL ADAPTOR MOBILE M1 AC/DC R L DEVICE IN IN IN RSENSE Si1470DH OUT VIN 10V/DIV ICABLE C + GATE OUT CABLE SENSE OUT LOAD LTC4361 VOUT IN 1V/DIV GND ICABLE 20A/DIV 436112 F05a 5µs/DIV 436112 F05b RIN = 150mΩ, LIN = 0.7µH, RSENSE = 25mΩ LOAD = 10Ω, COUT = 10µF Figure 5. 20V Hot-Plug into the LTC4361Input Transients LIN and RIN form an LC tank circuit with any capacitance Figure 4 shows a typical setup when an AC wall adap- at IN. If the wall adaptor is powered up first, plugging the tor charges a mobile device. The inductor L wall adaptor output to IN does the equivalent of applying IN represents the lumped equivalent inductance of the cable and the a voltage step to this LC circuit. The resultant voltage EMI filter found in some wall adaptors. R overshoot at IN can rise to twice the DC output voltage IN is the lumped equivalent resistance of the cable, adaptor output capaci- of the wall adaptor as shown in Figure 4. Figure 5 shows tor ESR and the connector contact resistance. the 20V adaptor output applied to the LTC4361. Due to the low capacitance at the IN pin, the plug-in transient has been brought down to a manageable level. Rev C 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
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