參數(shù)資料
型號: LT4356HMS-3#PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 模擬信號調(diào)理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO10
封裝: LEAD FREE, PLASTIC, MSOP-10
文件頁數(shù): 8/24頁
文件大?。?/td> 231K
代理商: LT4356HMS-3#PBF
LT4356-3
16
43563fa
First, calculate the resistive divider value to limit VOUT to
16V during an overvoltage event:
V
REG =
1.25V R1 + R2
()
R2
= 16V
Set the current through R1 and R2 during the overvoltage
condition to 250μA.
R2 =
1.25V
250μA
= 5kΩ
Choose 4.99kΩ for R2.
R1 =
16V – 1.25V
() R2
1.25V
= 58.88kΩ
The closest standard value for R1 is 59kΩ.
Next calculate the sense resistor, RSNS, value:
R
SNS =
50mV
I
LIM
=
50mV
5A
= 10mΩ
CTMR is then chosen for 1ms of early warning time:
C
TMR =
1ms 5μA
100mV
= 50nF
The closest standard value for CTMR is 47nF.
Finally, calculate R4 and R5 for the 6V low battery threshold
detection:
6V =
1.25V R4 + R5
()
R5
Choose 100kΩ for R5.
R4 =
6V – 1.25V
() R5
1.25V
= 380kΩ
Select 383kΩ for R4.
The pass transistor, Q1, should be chosen to withstand
the output short condition with VCC = 14V.
The total overcurrent fault time is:
t
OC =
47nF 0.85V
45.5μA
= 0.878ms
The power dissipation on Q1 equals to:
P =
14V 50mV
10mΩ
= 70W
These conditions are well within the Safe Operating Area
of IRLR2908.
APPLICATIONS INFORMATION
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