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参数资料
| 型号： | TPS2458RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | PLASTIC, QFP-32 |
| 文件页数： | 15/28页 |
| 文件大小： | 966K |
| 代理商： | TPS2458RHBR |
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Transient Protection
SPIKE
NOM
LOAD
L
V
I
C
=
+
(8)
STRAIGHTWIRE
4 length
L
0.2 length
ln
0.75
diameter
@
-
÷
÷
÷
÷
è
è
è
(
)
2
SPIKE
NOM
LI
C
V
=
-
(9)
SLUS916 – FEBRUARY 2009 ............................................................................................................................................................................................ www.ti.com
TPS2458 devices in deployed systems are not likely to have long, inductive feeds or long load wires. However, it
is always advised that an analysis be performed to determine the need for transient protection. When the
TPS2458 interrupts current flow any inductance on the input will tend to cause a positive voltage spike on the
input and any inductance on the output will tend to cause a negative voltage spike on the output. The following
equations allow the designer to make a reasonably accurate prediction of the voltage spike due to interruptions in
current.
where
V
NOM is the nominal voltage at terminal being analyzed
L is the combined inductance of feed to RTN lines.
C is the capacitance at point of disconnect.
I
LOAD is the current through terminal at TDISCONNECT
This equation can be used to calculate the capacitance required to limit the voltage spike to a desired level
above the nominal voltage.
22
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS2458
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