參數(shù)資料
型號(hào)： LTC4097EDDB
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 電源管理
英文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12
封裝： 3 X 2 MM, 0.75 MM HEIGHT, PLASTIC, DFN-12
文件頁(yè)數(shù)： 10/20頁(yè)
文件大?。?/td> 219K
代理商： LTC4097EDDB
LTC4097
18
4097f
APPLICATIONS INFORMATION
the nearest 1% value is 105k.
R1 = 0.536 105k – 0.4368 100k = 12.6k
the nearest 1% value is 12.7k. The nal solution is shown
in Figure 5 and results in an upper trip point of 45°C and
a lower trip point of 0°C.
Protecting the USB Pin and Wall Adapter Input from
Overvoltage Transients
Caution must be exercised when using ceramic capaci-
tors to bypass the USBIN or the wall adapter inputs. High
voltage transients can be generated when the USB or wall
adapter is hot plugged. When power is supplied via the
USB bus or wall adapter, the cable inductance along with
the self resonant and high Q characteristics of ceramic
capacitors can cause substantial ringing which could
exceed the maximum voltage ratings and damage the
LTC4097. Refer to Linear Technology Application Note 88,
entitled “Ceramic Input Capacitors Can Cause Overvoltage
Transients” for a detailed discussion of this problem.
Always use an oscilloscope to check the voltage wave-
forms at the USBIN and DCIN pins during USB and wall
adapter hot-plug events to ensure that overvoltage
transients have been adequately removed.
Reverse Polarity Input Voltage Protection
In some applications, protection from reverse polarity
voltage on the input supply pins is desired. If the sup-
ply voltage is high enough, a series blocking diode can
be used. In other cases where the voltage drop must be
kept low, a P-channel MOSFET can be used (as shown in
Figure 6).
WALL
ADAPTER
DCIN
LTC4097
DRAIN-BULK
DIODE OF FET
4097 F06
Figure 6. Low Loss Input Reverse Polarity Protection
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