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 /  PTC Thermistor  /  NTC Thermistor


PTC Thermistor for Degaussing Circuit (Degausser)

Description

PTC thermistor degauss the shadow mask of color picture tube by reducing the alternating current flowing through the degaussing coil within a short period of time. A large difference between inrush current and residual current is crucial for good degaussing. We can provide leaded and housed PTC thermsitor for degaussing purpose. Particularly, in a double PTC, a PTC connected to the coil, as compared to a single PTC, this configuration permits the residual current to reduce further.

PTC degaussing principle

By using dual PTC thermistor, residual current is significantly reduced.

PTC Degausser Application

Degaussing of picture tube, such as color TV, monitor.

PTC Degausser Features

﹞Optional on 3 construction, resin coated leaded form, 2 pins, dual PTC 3 pins.

﹞Nominal resistance from 3 ohm to 36 ohm.

Outlook and Dimension (mm)

AMWEI PTC degausser resin coated leaded disk form data sheet

Nominal Resistance
R25
(次)
Rated. Voltage
(V)
Max. Voltage
(V)
Current Characteristics Switch Temperature
ㄗ⊥ㄘ
Coil Resistance
(次)
Diameter
(mm)
Thickness
(mm)
Initial Current
(A)
After 3 seconds
(mA)
After 180 seconds
(mA)
5 110 140 ≡35 ≒300 ≒60

60㊣10

3.5

20

7

7 110 140 ≡28 ≒300 ≒60 3.5
8 110 140 ≡22 ≒300 ≒60 5
9 110 140 ≡21 ≒300 ≒60 5
12 110 140 ≡17 ≒300 ≒60 5
7 220 270 ≡22 ≒300 ≒45 20
9 220 270 ≡20 ≒300 ≒45 20
12 220 270 ≡22 ≒300 ≒45 15
14 220 270 ≡20 ≒300 ≒45 15
18 220 270 ≡19 ≒300 ≒45 12
27 220 270 ≡15 ≒300 ≒30 10 11.5-13.0 7

AMWEI PTC degausser encased 2 pins form data sheet

Nominal Resistance
R25
(次)
Rated. Voltage
(V)
Max. Voltage
(V)
Current Characteristics Switch Temperature
ㄗ⊥ㄘ
Coil Resistance
(次)
Min. coil resistance
(mm)
Initial Current
(A)
After 3 seconds
(mA)
After 180 seconds
(mA)
3 110 140 ≡22 ≒300 ≒60

60㊣10

10 5
4.5 110 140 ≡30 ≒300 ≒60 5 4
5 110 140 ≡35 ≒300 ≒60 3.5 1
5 110 140 ≡24 ≒300 ≒60 5 4
8 110 140 ≡22 ≒300 ≒60 5 3.5
9 110 140 ≡20 ≒250 ≒50 5 3
12 110 140 ≡17 ≒250 ≒50 5 3
14 110 140 ≡15 ≒250 ≒50 5 3
4.5 220 270 ≡30 ≒200 ≒50 15 12
7 220 270 ≡27 ≒200 ≒50 15 12
9 220 270 ≡24 ≒200 ≒40 15 10
12 220 270 ≡24 ≒200 ≒40 12 8
14 220 270 ≡24 ≒200 ≒40 10 8
18 220 270 ≡22 ≒200 ≒40 8 6
27 220 270 ≡17 ≒200 ≒40 6 5
14 220 270 ≡24 ≒300 ≒50

80㊣10

10 8
18 220 270 ≡20 ≒300 ≒50 10 8

AMWEI PTC degausser dual PTC 3 pins form data sheet

Nominal Resistance
R25
(次)
Resistance of Assistance PTC Heater
(次)
Rated. Voltage
(V)
Max. Voltage
(V)
Current Characteristics Switch Temperature
ㄗ⊥ㄘ
Coil Resistance
(次)
Initial Current
(A)
After 3 seconds
(mA)
After 180 seconds
(mA)
3

100-1000

110 140 ≡28 ≒300 ≒15

60㊣10

5.5
4.5 110 140 ≡23 ≒300 ≒15 8
5 110 140 ≡35 ≒300 ≒15 3.5
7 110 140 ≡24 ≒300 ≒15 5
8 110 140 ≡22 ≒300 ≒15 5
9 110 140 ≡17 ≒300 ≒15 8
12 110 140 ≡14 ≒300 ≒15 8
14 110 140 ≡12 ≒300 ≒15 10
4.5 220 270 ≡30 ≒300 ≒12 15
7 220 270 ≡26 ≒300 ≒10 15
9 220 270 ≡24 ≒300 ≒10 15
12 220 270 ≡24 ≒300 ≒10 12
14 220 270 ≡24 ≒300 ≒10 10
18 220 270 ≡22 ≒300 ≒10 8
27 220 270 ≡14.5 ≒300 ≒6 12
36 220 270 ≡12.5 ≒300 ≒6 10

Reliability data

Test Standard Test conditions |忖R25/R25|
Switching test at room temperature IEC 60738-1 Vmax; Rs Room temperature Number of cycles: 10000 <20%
Life test at Vmax/Top IEC 60738-1 Storage at Vmax/Top for T: 1000h <20%
Rapid change of temperature in air IEC600628-2-14, Test Na T=TLCT, T=TUCT Number of cycles: 5 T:30min <20%
Climate sequence IEC 600628-2-27 Dry heat: T= TUCT, t:16h Damp heat first cycle Cold: T= TLCT t:2h Damp heat 5 cycles
Damp heat IEC 600628-2-3 Temperature of air: 40oC Relative humidity of air: 93% Duration: 56 days <10%

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