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參數(shù)資料
| 型號： | LTC4361IDC-1#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 2 X 2 MM, LEAD FREE, PLASTIC, DFN-8 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大小： | 327K |
| 代理商： | LTC4361IDC-1#TRPBF |
LTC4361-1/LTC4361-2
10
436112fa
APPLICATIONS INFORMATION
Figure 4. 20V Hot-Plug into a 10μF Capacitor
Figure 5. 20V Hot-Plug into the LTC4361
+
LOAD
436112 F04a
MOBILE
DEVICE
WALL ADAPTOR
AC/DC
COUT
IN
LIN
RIN
CABLE
ICABLE
VIN
10V/DIV
ICABLE
20A/DIV
5μs/DIV
436112 F04b
RIN = 150mΩ,
LIN = 0.7μH
LOAD = 10Ω, COUT = 10μF
+
LOAD
LTC4361
M1
Si1470DH
GATE
GND
436112 F05a
MOBILE
DEVICE
WALL ADAPTOR
AC/DC
COUT
SENSE OUT
IN
OUT
LIN
RIN
RSENSE
CABLE
ICABLE
VIN
10V/DIV
VOUT
1V/DIV
ICABLE
20A/DIV
5μs/DIV
436112 F05b
RIN = 150mΩ,
LIN = 0.7μH, RSENSE = 25mΩ
LOAD = 10Ω, COUT = 10μF
Input Transients
Figure 4 shows a typical setup when an AC wall adaptor
charges a mobile device. The inductor LIN represents the
lumped equivalent inductance of the cable and the EMI lter
found in some wall adaptors. RIN is the lumped equivalent
resistance of the cable, adaptor output capacitor ESR and
the connector contact resistance.
LIN and RIN form an LC tank circuit with any capacitance
at IN. If the wall adaptor is powered up rst, plugging the
wall adaptor output to IN does the equivalent of applying
a voltage step to this LC circuit. The resultant voltage
overshoot at IN can rise to twice the DC output voltage
of the wall adaptor as shown in Figure 4. Figure 5 shows
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.
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