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參數(shù)資料
| 型號： | SRV08-4 |
| 英文描述： | RailClamp Low Capacitance TVS Diode Array / SOT-23 |
| 中文描述： | RailClamp低電容二極管二極管陣列/ SOT - 23封裝 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 497K |
| 代理商： | SRV08-4 |
5
2002 Semtech Corp.
www.semtech.com
PROTECTION PRODUCTS
Applications Information
(continued)
SRV08-4
duration ESD events, the top diode will be forward
biased when the voltage on the protected line exceeds
the reference voltage plus the V
drop of the diode.
For negative events, the bottom diode will be biased
when the voltage exceeds the V
of the diode. At first
approximation, the clamping voltage due to the charac-
teristics of the protection diodes is given by:
these devices virtually eliminate the disadvantages of
using discrete components to implement this topology.
Consider the situation shown in Figure 3 where dis-
crete diodes or diode arrays are configured for rail-to-
rail protection on a high speed line. During positive
V
C
= V
CC
+ V
F
V
C
= -V
F
(for positive duration pulses)
(for negative duration pulses)
However, for fast rise time transient events, the
effects of parasitic inductance must also be consid-
ered as shown in Figure 4. Therefore, the actual
clamping voltage seen by the protected circuit will be:
V
C
= V
CC
+ V
+ L
di
ESD
/dt (for positive duration pulses)
V
C
= -V
F
- L
G
di
ESD
/dt
(for negative duration pulses)
ESD current reaches a peak amplitude of 30A in 1ns
for a level 4 ESD contact discharge per IEC 61000-4-2.
Therefore, the voltage overshoot due to 1nH of series
inductance is:
V = L
P
di
ESD
/dt = 1X10
-9
(30 / 1X10
-9
) = 30V
Example:
Consider a V
= 5V, a typical V
of 30V (at 30A) for the
steering diode and a series trace inductance of 10nH.
The clamping voltage seen by the protected IC for a
positive 8kV (30A) ESD pulse will be:
V
C
= 5V + 30V + (10nH X 30V/nH) = 335V
Note that it is not uncommon for the V
of discrete
diodes to exceed the damage threshold of the pro-
tected IC. This is due to the relatively small junction
area of typical discrete components. It is also possible
that the power dissipation capability of the discrete
diode will be exceeded, thus destroying the device.
The RailClamp is designed to overcome the inherent
disadvantages of using discrete signal diodes for ESD
suppression.
Figure 3 - “Rail-To-Rail” Protection Topology
(First Approximation)
Figure 4 - The Effects of Parasitic Inductance
When Using Discrete Components to Implement
Rail-To-Rail Protection
Figure 5 - Rail-To-Rail Protection Using
RailClamp TVS Arrays
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相關代理商/技術參數(shù) |
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|---|---|
| SRV-1000-R | 制造商:JAMECO VALUEPRO 功能描述:POWER TRANSFORMER,VARIABLE,110/220VAC INPUT,0-240VAC OUTPUT, |
| SRV-120-KIT | 制造商:SAMLEX 功能描述: |
| SRV2.8-4 | 制造商:PROTEC 制造商全稱:Protek Devices 功能描述:ULTRA LOW CAPACITANCE STEERING DIODE/TVS ARRAY |
| SRV2.8-4-T7 | 制造商:ProTek Devices 功能描述: |
| SRV-2000-R | 制造商:JAMECO VALUEPRO 功能描述:POWER TRANSFORMER,VARIABLE,110/220VAC INPUT,0-240VAC OUTPUT, |
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