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Circuit Protection Power NTC Thermistor MF72 5D-9 3Amp 5 Ohm 9mm Inrush Current Limiting For LED Driver Power

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Circuit Protection Power NTC Thermistor MF72 5D-9 3Amp 5 Ohm 9mm Inrush Current Limiting For LED Driver Power

Country/Region china
City & Province dongguan guangdong
Categories Batteries

Product Details

 

Circuit Protection Power NTC Thermistor MF72 5D-9 3Amp 5 Ohm 9mm Inrush Current Limiting For LED Driver Power

 

 

Electrical Performances and Dimension (mm)

 

 

TypeRated Resistance(A)DLF

Dimensions

(Unit:mm)

Max. Steady

State Current

DmaxLminF±1Tmaxd
5D-5516.5255.0/2.550.55/0.45
10D-5100.76.5255.0/2.550.55/0.45
20D-5200.56.5255.0/2.550.55/0.45
5D-7528.525550.55
8D-7818.525550.55
10D-71018.525550.55
12D-71218.525550.55
16D-7160.78.525550.55
20D-7200.68.525550.55
22D-7220.68.525550.55
33D-7330.58.525550.55
3D-93410.5257.5/5.05.50.78/0.55
4D-94410.5257.5/5.05.50.78/0.55
5D-95310.5257.5/5.05.50.78/0.55
6D-96210.5257.5/5.05.50.78/0.55
8D-97210.5257.5/5.05.50.78/0.55
10D-910210.5257.5/5.05.50.78/0.55
12D-912110.5257.5/5.05.50.78/0.55
16D-916110.5257.5/5.05.50.78/0.55
20D-920110.5257.5/5.05.50.78/0.55
22D-922110.5257.5/5.05.50.78/0.55
30D-930110.5257.5/5.05.50.78/0.55
33D-933110.5257.5/5.05.50.78/0.55
50D-950110.5257.5/5.05.50.78/0.55
60D-9600.810.5257.5/5.05.50.78/0.55
2.5D-112.5512.5257.5/5.05.50.78
3D-113512.5257.5/5.05.50.78
4D-114412.5257.5/5.05.50.78
5D-115412.5257.5/5.05.50.78
6D-116312.5257.5/5.05.50.78
8D-118312.5257.5/5.05.50.78
10D-1110312.5257.5/5.05.50.78
12D-1112212.5257.5/5.05.50.78
16D-1116212.5257.5/5.05.50.78
20D-1120212.5257.5/5.05.50.78
22D-1122212.5257.5/5.05.50.78
30D-11301.512.5257.5/5.05.50.78
33D-11331.512.5257.5/5.05.50.78
1.3D-131.3714.5257.560.78
1.5D-131.5614.5257.560.78
3D-133614.5257.560.78
4D-134514.5257.560.78
5D-135514.5257.560.78
6D-136414.5257.560.78
7D-137414.5257.560.78
8D-138414.5257.560.78
10D-1310414.5257.560.78
12D-1312314.5257.560.78
15D-1315314.5257.560.78
16D-1316314.5257.560.78
20D-1320314.5257.560.78
30D-13302.514.5257.560.78
47D-1347214.5257.560.78
1.3D-151.3816.5257.560.78
1.5D-151.8816.5257.560.78
3D-153716.5257.560.78
5D-155616.5257.560.78
6D-156516.5257.560.78
7D-157516.5257.560.78
8D-158516.5257.560.78
10D-1510516.5257.560.78
12D-1512416.5257.560.78
15D-1515416.5257.560.78
16D-1516416.5257.560.78
20D-1520416.5257.560.78
30D-1530316.5257.560.78
33D-1533316.5257.560.78
47D-1547316.5257.560.78
50D-1550316.5257.560.78
0.7D-200.71221.52510/7.571
1.3D-201.3921.52510/7.571
2.2D-202.2821.52510/7.571
2.5D-202.5821.52510/7.571
3D-203821.52510/7.571
5D-205721.52510/7.571
6D-206621.52510/7.571
8D-208621.52510/7.571
10D-2010621.52510/7.571
12D-2012521.52510/7.571
16D-2016521.52510/7.571
3D-253926.52510/7.571
5D-255826.52510/7.571
8D-258726.52510/7.571
10D-2510726.52510/7.581

 

 

Description

 

The POWER THERMISTOR is a device for suppressing inrush current to an electric circuit.
Circuits including electric bulbs or capacitors induce an inrush current more than 100 times the normal current when the circuit switch is turned on. The POWER THERMISTOR in the circuits protects electric equipments from being damaged by limiting the inrush current.

 

 

 

Application

 

Conversion power supply, switch power, UPS power, Kinds of electric heter, electronic energy-saving lamps, electronic ballast etc all kinds of power cicuit proterction of electronic equipments, filament proterction of CRT, bulb and other lighting lamps.

 

 

Critical Technical Parameters of NTC Thermistor


* Rt---Resistance Value at Zero-power
It's a resistance which is got at a fixed temperature on a basis of a testing power which causes resistance to Vary in a range which can be ignored in relation to the total testing eror.


* R25---Resistance Value at Rated Zero-power
The design resistance of the thermistor usually refers to the resistance value got at Zero-power at 25℃ , which is usually indicated on the thermistor.


* Max. steady state current.Imax.
The maximum allowable continuous current passing through thermistor at 25℃.


* Dissipation Coefficient δ
It's the ratio of the changes with a thermistor dissipation power, in a pre-set ambient temperature, to the changes with the temperature. The formula is as below:δ = △P/ △T ,δ changes in response when the ambient temperature changes, within the ranges of the working temperature.

 

 

How to use the power thermistor

 

The most suitable power thermistor for the above circuit is required to fulfill the following terms and conditions.

1. The permissible current at ambient temperature of 55 should be over 2A.

2. The thermistor resistance for suppressive current which becomes below 30A should be over 4.2 ohm from the under-mentioned formula.

R : Intial resistance value in the circuit is 1 ohm (100V/100A)

R : Rated zero-power resistance at 25C

3. Max. capacitance shall be over 2000 at AC 100V. Accordingly, suitable thermistors are 6D-22, 5D-18 and 8D-18, and if we consider in the points of small time constant which means a small size and large effect for suppressive current which means large rated zero power resistance, 8D-18 is the most suitable one. Use the following circuit in the power supply for 100V and 200V.

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