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參數(shù)資料
| 型號： | LTC4361CTS8-2#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： | LEAD FREE, PLASTIC, MO-193, TSOT-23, 8 PIN |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 327K |
| 代理商： | LTC4361CTS8-2#TRPBF |
LTC4361-1/LTC4361-2
11
436112fa
APPLICATIONS INFORMATION
As the IN pin can withstand up to 80V, a high voltage N-
channel MOSFET can be used to protect the system against
rugged abuse from high transient or DC voltages up to the
BVDSS of the MOSFET. Figure 6 shows a 50V input plugged
into the LTC4361 controlling a 60V rated MOSFET.
Input transients also occur when the current through the
cable inductance changes abruptly. This can happen when
the LTC4361 turns off the N-channel MOSFET rapidly in an
overvoltage or overcurrent event. Figure 7 shows an input
transient after an overcurrent. The current in LIN will cause
VIN to overshoot and avalanche the N-channel MOSFET to
COUT. Typically, IN will be clamped to a voltage of VOUT +
1.3 (BVDSS of Si1470DH) = 45V. This is well below the
85V absolute maximum voltage rating of the LTC4361.
The single, nonrepetitive, pulse of energy (EAS) absorbed
by the MOSFET during this avalanche breakdown with a
peak current IAS is approximated by the formula:
EAS = 0.5 LIN IAS2
For LIN = 0.7μH and IAS= 4A, then EAS = 5.6μJ. This is within
the IAS and EAS capabilities of most MOSFET’s including
the Si1470DH. So in most instances, the LTC4361 can
ride through such transients without a bypass capacitor,
transient voltage suppressor or other external components
at IN. Note that if an IN bypass capacitor is used, the VIN
transients will overshoot less but last longer. If VIN dips
below VIN(UVL) for more than 10μs, the internal latch-off
latch in the LTC4361-1 could be inadvertently reset.
Figure 6. 50V Hot-Plug into the LTC4361
Figure 7. Overcurrent Turn-Off and Resulting Input Transient
VIN
20V/DIV
VOUT
1V/DIV
ICABLE
5A/DIV
5μs/DIV
436112 F06
FDC5612
RIN = 150mΩ, LIN = 0.7μH
RSENSE = 25mΩ, LOAD = 10Ω, COUT = 10μF
VIN
20V/DIV
VGATE
10V/DIV
VOUT
5V/DIV
ICABLE
5A/DIV
2μs/DIV
436112 F07
FIGURE 5 CIRCUIT
RIN = 150mΩ, LIN = 0.7μH
RSENSE = 25mΩ, LOAD = 10Ω, COUT = 10μF
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