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TCM1060 Datasheet(PDF) 4 Page - Texas Instruments

Part # TCM1060
Description  DUAL TRANSIENT-VOLTAGE SUPPRESSORS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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TCM1060 Datasheet(HTML) 4 Page - Texas Instruments

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TCM1030, TCM1060
DUAL TRANSIENT-VOLTAGE SUPPRESSORS
SCTS040A – JUNE 1989 – REVISED MAY 1996
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
0
– 0.1
– 0.3
– 0.4
– 0.5
0.4
– 0.2
– 50 – 40 – 30 – 20 – 10
0
10
0.2
0.1
0.3
Tip or Ring to GND Voltage – V
0.5
20
30
40
50
VS = – 48 V
TA = 25°C
TIP OR RING CURRENT
vs
TIP OR RING TO GND VOLTAGE
Figure 1
APPLICATION INFORMATION
The trip voltage represents the most negative level of stress applied to the system. Positive transients are
clamped by diodes D1 and D2. When a negative transient is applied, current flows from VS to TIP or RING where
the transient voltage is applied. When the current through TIP or RING reaches the pulse-trip current, the SCR
turns on and shorts TIP or RING to GND. The majority of the transient energy is dissipated in the external resistor
(nominally 100
Ω for the TCM1030 and 50 Ω for the TCM1060). Current into VS ceases when the SCR turns
on. When the energy of the transient has been dissipated so that the current into TIP or RING due to the transient
plus the battery feed supply is less than the holding current, the SCR turns off.
To help ensure reliability and consistency in the firing voltage, it is recommended that two capacitors be
connected between VS and GND, as close to the device terminals as possible. One capacitor should be a 0.1 µF,
100 V ceramic unit and the other, a 0.47
µF, 100 V stacked-film (not wound) metalized plastic capacitor. If
inductance is present in the line to VS, these capacitors help prevent overshoot in the firing voltage during fast
rise-time transients.
To avoid dc latchup after the SCR has fired, the current must be less than the holding current, IH. To prevent
this from happening, the line feed current must be limited to the following conditions:
V
TP *
V
RP
R
line )
2Rp
t I
H
where VTP and VRP are the voltages on TIP and RING, respectively, of the TCM1030 or TCM1060. Induced ac
currents into TIP or RING (e.g., power-line inductive coupling) must be less than the trip current to prevent the
SCR from firing.


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