Datasheet LTC4362-1, LTC4362-2 (Analog Devices) - 9
| Fabricante | Analog Devices |
| Descripción | 1.2A Overvoltage/Overcurrent Protector |
| Páginas / Página | 14 / 9 — APPLICATIONS INFORMATION. Figure 3. 20V Hot-Plug Into a 10µF Capacitor. … |
| Revisión | B |
| Formato / tamaño de archivo | PDF / 649 Kb |
| Idioma del documento | Inglés |
APPLICATIONS INFORMATION. Figure 3. 20V Hot-Plug Into a 10µF Capacitor. Figure 4. 20V Hot-Plug Into the LTC4362
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APPLICATIONS INFORMATION
WALL ADAPTOR RIN LIN MOBILE DEVICE AC/DC IN VIN + ICABLE COUT 10V/DIV CABLE LOAD I 436212 F03a CABLE 20A/DIV 5µs/DIV 436212 F03b RIN = 150mΩ, LIN = 0.7µH LOAD = 10Ω, COUT = 10µF
Figure 3. 20V Hot-Plug Into a 10µF Capacitor
WALL ADAPTOR RIN LIN MOBILE DEVICE AC/DC IN OUT IN OUT + ICABLE VIN LT4362 LOAD 10V/DIV CABLE COUT GND VOUT 1V/DIV 436212 F04a ICABLE 1A/DIV 5µs/DIV 436212 F04b RIN = 150mΩ, LIN = 0.7µH LOAD = 10Ω, COUT = 10µF
Figure 4. 20V Hot-Plug Into the LTC4362 Thermal Shutdown
LIN and RIN form an LC tank circuit with any capacitance The internal N-channel MOSFET is protected by a thermal at IN. If the wall adaptor is powered-up first, plugging the shutdown circuit. If its temperature reaches 150°C, it will wall adaptor output to IN does the equivalent of applying a shut off immediately and the PWRGD pull-down releases. voltage step to this LC circuit. The resultant voltage over- It will turn on again after its temperature drops below shoot at IN can rise to twice the DC output voltage of the 140°C. wall adaptor (or more if ceramic capacitors with large volt- age coefficients are used) as shown in Figure 3. Figure 4
Input Transients
shows the 20V adaptor output applied to the LTC4362. Due to the low capacitance at the IN pin, the plug-in tran- Figure 3 shows a typical setup when an AC wall adap- sient has been brought down to a manageable level. tor charges a mobile device. The inductor LIN represents the lumped equivalent inductance of the cable and the Input transients also occur when the current through EMI filter found in some wall adaptors. R the cable inductance changes abruptly. This can hap- IN is the lumped equivalent resistance of the cable, adaptor output capaci- pen when the LTC4362 turns off its internal N-channel tor ESR and the connector contact resistance. MOSFET quickly in an overvoltage or overcurrent event. Rev. B For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings order information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
APPLICATIONS INFORMATION
WALL ADAPTOR RIN LIN MOBILE DEVICE AC/DC IN VIN + ICABLE COUT 10V/DIV CABLE LOAD I 436212 F03a CABLE 20A/DIV 5µs/DIV 436212 F03b RIN = 150mΩ, LIN = 0.7µH LOAD = 10Ω, COUT = 10µF
Figure 3. 20V Hot-Plug Into a 10µF Capacitor
WALL ADAPTOR RIN LIN MOBILE DEVICE AC/DC IN OUT IN OUT + ICABLE VIN LT4362 LOAD 10V/DIV CABLE COUT GND VOUT 1V/DIV 436212 F04a ICABLE 1A/DIV 5µs/DIV 436212 F04b RIN = 150mΩ, LIN = 0.7µH LOAD = 10Ω, COUT = 10µF
Figure 4. 20V Hot-Plug Into the LTC4362 Thermal Shutdown
LIN and RIN form an LC tank circuit with any capacitance The internal N-channel MOSFET is protected by a thermal at IN. If the wall adaptor is powered-up first, plugging the shutdown circuit. If its temperature reaches 150°C, it will wall adaptor output to IN does the equivalent of applying a shut off immediately and the PWRGD pull-down releases. voltage step to this LC circuit. The resultant voltage over- It will turn on again after its temperature drops below shoot at IN can rise to twice the DC output voltage of the 140°C. wall adaptor (or more if ceramic capacitors with large volt- age coefficients are used) as shown in Figure 3. Figure 4
Input Transients
shows the 20V adaptor output applied to the LTC4362. Due to the low capacitance at the IN pin, the plug-in tran- Figure 3 shows a typical setup when an AC wall adap- sient has been brought down to a manageable level. tor charges a mobile device. The inductor LIN represents the lumped equivalent inductance of the cable and the Input transients also occur when the current through EMI filter found in some wall adaptors. R the cable inductance changes abruptly. This can hap- IN is the lumped equivalent resistance of the cable, adaptor output capaci- pen when the LTC4362 turns off its internal N-channel tor ESR and the connector contact resistance. MOSFET quickly in an overvoltage or overcurrent event. Rev. B For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings order information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts