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NP0640SBMCT3G 데이터시트(HTML) 5 Page - ON Semiconductor

부품명 NP0640SBMCT3G
상세내용  80A, Ultra Low Capacitance TSPD
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제조사  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
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NP0640SBMCT3G 데이터시트(HTML) 5 Page - ON Semiconductor

  NP0640SBMCT3G 데이터시트 HTML 1Page - ON Semiconductor NP0640SBMCT3G 데이터시트 HTML 2Page - ON Semiconductor NP0640SBMCT3G 데이터시트 HTML 3Page - ON Semiconductor NP0640SBMCT3G 데이터시트 HTML 4Page - ON Semiconductor NP0640SBMCT3G 데이터시트 HTML 5Page - ON Semiconductor NP0640SBMCT3G 데이터시트 HTML 6Page - ON Semiconductor NP0640SBMCT3G 데이터시트 HTML 7Page - ON Semiconductor  
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NP−SBMC Series
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5
TIME (ms)
0
50
0
100
tr = rise time to peak value
tf = decay time to half value
tr
tf
Peak
Value
Half Value
1
10
100
0.1
1
10
100
1000
Figure 2. Nonrepetitive On−State Current vs. Time
(ITSM)
Figure 3. Nonrepetitive On−State Impulse vs.
Waveform (IPPS)
CURRENT DURATION (s)
Detailed Operating Description
The TSPD or Thyristor Surge Protection Device are
specialized silicon based overvoltage protectors, used to
protect sensitive electronic circuits from damaging
overvoltage transient surges caused by induced lightning
and powercross conditions.
The TSPD protects by switching to a low on state voltage
when the specified protection voltage is exceeded. This is
known as a “crowbar” effect. When an overvoltage occurs,
the crowbar device changes from a high−impedance to a
low−impedance state. This low−impedance state then offers
a path to ground, shunting unwanted surges away from the
sensitive circuits.
This crowbar action defines the TSPD’s two states of
functionality: Open Circuit and Short Circuit.
Open Circuit – The TSPD must remain transparent during
normal circuit operation. The device looks like an open
across the two wire line.
Short Circuit – When a transient surge fault exceeds the
TSPD protection voltage threshold, the devices switches on,
and shorts the transient to ground, safely protecting the
circuit.
Figure 4. Normal and Fault Conditions
Protected
Equipment
+
+
V(OP)
I(OP)
TSPD
Normal Circuit Operation
Protected
Equipment
+
+
V(Fault)
I(Fault)
TSPD
Operation during a Fault
I(Fault)
•TSPD looks like an open
•Circuit operates normally
•Fault voltage greater than Vbo occurs
•TSPD shorts fault to ground
•After short duration events the O/V
switches back to an open condition
•Worst case (Fail/Safe)
•O/V permanent short
•Equipment protected
The electrical characteristics of the TSPD help the user to
define the protection threshold for the circuit. During the
open circuit condition the device must remain transparent;
this is defined by the IDRM. The IDRM should be as low as
possible. The typical value is less than 5
mA.
The circuit operating voltage and protection voltage must
be understood and considered during circuit design. The
V(BO) is the guaranteed maximum voltage that the protected
circuit will see, this is also known as the protection voltage.
The VDRM is the guaranteed maximum voltage that will
keep the TSPD in its normal open circuit state. The TSPD
V(BO) is typically a 20−30% higher than the VDRM. Based
on these characteristics it is critical to choose devices which
have a VDRM higher than the normal circuit operating
voltage, and a V(BO) which is less than the failure threshold
of the protected equipment circuit. A low on−state voltage
Vt allows the TSPD to conduct large amounts of surge
current (500 A) in a small package size.
Once a transient surge has passed and the operating
voltage and currents have dropped to their normal level the
TSPD changes back to its open circuit state.


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