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參數(shù)資料
| 型號： | P3000AA61RP |
| 英文描述： | MCU CMOS 44LD LOW PWR, -40C to +85C, 44-QFN, T/R |
| 中文描述： | SIDAC的| 330V五（公報）最大| 800mA的我（縣）|對220VAR |
| 文件頁數(shù)： | 127/161頁 |
| 文件大?。?/td> | 986K |
| 代理商： | P3000AA61RP |
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SIDACtor
Data Book
Over-Current Protection
Teccor Electronics
(972) 580-7777
5 - 11
T
>
In addition to protecting against over-voltage conditions, equipment should also be
protected from over-current conditions using either PTC
’
s, fuses, power/line feed
resistors, or flameproof resistors. In all instances the over-current protector is a series
element placed in front of the over-voltage protector on
either
Tip
or
Ring for metallic
(closed loop) applications and on
both
Tip
and
Ring for longitudinal (grounded)
applications.
PTC’s
Overview
PTC
’
s are positive temperature coefficient thermistors used to limit current. During a
fault condition, heat is generated at a rate equal to I
2
R. When this heat becomes
sufficient, the PTC will increase its resistance asymptotically until the device simulates
an open, limiting the current flow to the rest of the circuit. As the fault condition drops
below the PTC
’
s holding current, the device begins to reset, approximating its original
off-state value of impedance.
Advantages
Because PTC
’
s are resettable devices, they work well in a variety of industrial
applications where electrical components can not withstand multiple, low current
faults.
Restrictions
Although PTC
’
s are well suited for the industrial environment and in many telecom
applications, they exhibit some limitations that have prevented them from being
endorsed by the entire telecommunications industry. Limitations include low surge
current ratings, unstable resistance, and poor packaging options.
Applications
PTC
’
s are used in a variety of applications. In addition to protecting
telecommunications equipment, PTC
’
s are also used to prevent damage to
rechargeable battery packs, interrupt the current flow during a motor lock condition,
and limit the sneak currents that may cause damage to a 5-pin module.
Fuses
Overview
Due to their stability, fuses are one of the most popular solutions for meeting AC power
cross requirements for telecommunications equipment. Similar to PTC
’
s, fuses
function by reacting to the heat generated due to excessive current flow. Once the
fuses I
2
t rating is exceeded, the center conductor will open.
Advantages
Fuses are available in both surface mount and through hole packages and are able to
withstand the applicable regulatory requirements without the use of any additional
series impedance. Chosen correctly, fuses will only interrupt a circuit when extreme
fault conditions exist, and when coordinated properly with an over-voltage protector,
offer a very competitive and effective solution for transient immunity needs.
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