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參數(shù)資料
| 型號(hào)： | PACDN017 |
| 廠商： | California Micro Devices Corporation |
| 英文描述： | 18 CHANNEL ESD PROTECTION ARRAY WITH ZENER SUPPLY CLAMP |
| 中文描述： | 18通道ESD保護(hù)陣列與Zener供應(yīng)夾具 |
| 文件頁數(shù)： | 3/3頁 |
| 文件大?。?/td> | 133K |
| 代理商： | PACDN017 |
1999 California Micro Devices Corp. All rights reserved.
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
11/98
3
CALIFORNIA MICRO DEVICES
PAC DN017
Similarly for negative ESD pulses, parasitic series inductance from the V
N
pin to the ground rail will lead to drastically
increased negative voltage on the line being protected.
Another consideration is the output impedance of the power supply for fast transient currents. Most power supplies
exhibit a much higher output impedance to fast transient current spikes. In the V
Z
equation above, the V
Supply
term, in
reality, is given by (V
DC
+ I
esd
x R
out
), where V
DC
and R
out
are the nominal supply DC output voltage and effective output
impedance of the power supply respectively. As an example, a R
out
of 1 ohm would result in a 10V increment in V
Z
for a
peak I
esd
of 10A.
To mitigate these effects, a Zener diode has been integrated into this Protection Array between V
P
and V
N
. This Zener
diode clamps the maximum voltage of V
P
relative to V
N
at the breakdown voltage of the Zener diode. Although not strictly
necessary, it is recommended that V
P
be bypassed to the ground plane with a high frequency bypass capacitor. This will
lower the channel clamp voltage, and is especially effective when V
P
is much lower than the Zener breakdown voltage.
The value of this bypass capacitor should be chosen such that it will absorb the charge transferred by the ESD pulse with
minimal change in V
P
. Typically a value in the 0.1 μF to 0.2 μF range is adequate for IEC-61000-4-2 level 4 contact
discharge protection (8KV). For higher ESD voltages, the bypass capacitor should be increased accordingly. Ceramic chip
capacitors mounted with short printed circuit board traces are good choices for this application. Electrolytic capacitors
should be avoided as they have poor high frequency characteristics.
As a general rule, the ESD Protection Array should be located as close as possible to the point of entry of expected
electrostatic discharges. The power supply bypass capacitor mentioned above should be as close to the V
P
pin of the
Protection Array as possible, with minimum PCB trace lengths to the power supply and ground planes to minimize stray
series inductance.
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| PACDN017Q | 18 CHANNEL ESD PROTECTION ARRAY WITH ZENER SUPPLY CLAMP |
| PACDN027 | 17-CHANNEL TRANSIENT VOLTAGE SUPPRESSOR ARRAY |
| PACDN027Q | 17-CHANNEL TRANSIENT VOLTAGE SUPPRESSOR ARRAY |
| PACDN042Y3R | Transient Voltage Suppressors / ESD Protectors |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PACDN017Q | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:18 CHANNEL ESD PROTECTION ARRAY WITH ZENER SUPPLY CLAMP |
| PACDN027 | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:17-CHANNEL TRANSIENT VOLTAGE SUPPRESSOR ARRAY |
| PACDN027Q | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:17-CHANNEL TRANSIENT VOLTAGE SUPPRESSOR ARRAY |
| PACDN042 | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:Transient Voltage Suppressors / ESD Protectors |
| PACDN042M | 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:TRANSIENT VOLTAGE SUPPRESSOR ARRAYS |
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