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Questions tagged [ptc]

Many components have a positive temperature coefficient (PTC). (Questions about polyfuses should be tagged with [tag:polyfuse] instead).

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Can you explain the 3 terminals that PTC thermistors have

Okay, so I found from Amazon a cheap PTC thermistor with a fan, just search "Zerodis PTC" and you find it from there. I see it has 3 terminals, also other PTC elements do. Since it's a semiconductor ...
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Polyfuse value - laptop motherboard

Hello collective wisdom, I need to replace a surface mount Polyfuse on a laptop motherboard. However, I don't think there is a value on the fuse itself (there is what looks like a I or maybe a 1). ...
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43 views

ptc thermistor simulation in proteus

I want to simulate ptc thermistor in proteus.But I need this informations. 1) Thermal Contact Res. (°C/W) 2)Thermal Res. to Ambient (°C/W) 3)Time constant (s) datasheet information of ptc ...
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36 views

Resetable fuse leakage

I'm planning to use Resetable fuse PTC for cable protection of a sensor's cable. The sensor will not draw more than 40mA. So considering that PTC is not accurate and its affected by temperature I ...
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38 views

How effective is CID and PTC protection on batteries?

There is a source that states: 18650 batteries sold in the US are required to have CID and PTC protection. I've read that CID is just an insulation layer, and PTC is a resettable fuse which ...
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2answers
38 views

What options can be used to deliver power to a distant PTC in this scenario?

As a part of a project, I need to supply 24V DC to the terminals of a PTC type heater. The heater will be outdoors 50 meters far away from the 24V DC power supply as shown below: Without a long 50 ...
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1answer
50 views

Mains Filter for Power Line Comunication

I have two questions about Mains filters and their impedance effect on PLC. 1) With respect to signal propagation relative to the Line impedance: As the signal is sent, via the power line, it will ...
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1answer
64 views

What does it mean to trip in PTC Fuses?

Hi I want a current flowing 1A. I don't understand what does it mean to trip? (Image source - Farnell PTC datasheet) Does it mean to open the circuit? Should I be looking at a holding current that ...
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1answer
82 views

Control PTC heater with mosfet

I'm building an indoor greenhouse, I have gather a few tutorials on how to achieve what I need but on the heater I bought I can't seem to find anything that could help, and my knowledge on electricity ...
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2answers
135 views

Constant Power Micro Load

I am trying to make a circuit that slowly discharges a multi cell lithium battery to storage voltage. I already have a comparator circuit that can turn on or off discharging. I want to support 2s to ...
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168 views

What to use instead of 1k1 Ohm PTC thermistor?

I've got uni-t ut60a damaged. IC was replaced. Two tracks were repaired. The PTC thermistor of 1k1 Ohm is left. Unfortunately it is not easily available, in fact I couldn't find any of these being ...
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175 views

PTC Thermistor - Schematic Analysis

I am developing a redesign of a current PCB which uses the attached circuit in order to evaluate the temperature using a PTC thermistor (which is R3 in the given image). The circuit is connected to ...
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128 views

how to select the right TVS / fuse combination?

I am working on a design featuring the MP1495S switching regulator. The regulator will take 12V and output 5V. The maximum current I want to allow at the output of the regulator is 3A. 1) I am ...
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3answers
609 views

Fight inrush current with PTC, good go or not?

To power an amplifier, I use a lipo battery 3.7v (4000mah) or two 18650 batteries 3.7v (4000mah) in parallel with a DC/DC boost converter that boost the voltage to 24.2 volts. The circuit performs ...
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1answer
547 views

How can I estimate what will blow first - PTC/TVS protection combination or my IC

I want to protect an IC output (MOSFET driver) that the vendor says can survive V_cc +0.3V on the output pin from an accidentially connected overvoltage of about 35V on the plug. Problem: my V_cc is ...
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1answer
485 views

Can I put a zener diode *before* PTC to protect the supply?

I'm designing a small module that takes power from USB and provides it to a breadboard for prototyping. My target audience will just be hobbyists so I want to include some protection. I'm more ...
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1answer
455 views

Automatic Temperature Controller with Thermistor (Incandescent BULB)

I'm new in this site And sorry for my english language.. I need a circuit for my little oven. I use an incandescent bulb (4x100W) for heating, and I want make a dimmer circuit to change output using ...
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658 views

PTC Reset switch Voltage drop

This question might fly close to the rule about asking to select parts. What I'm really asking is what parameters of a PTC Fuse I should be looking for. Or even should I be using one. [Software head, ...
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1answer
180 views

Pt 200 Sensor Reading

Are the connections for reading a temperature sensor using CCS( constant current source) really like in my picture? The analog and the current source seem to be shorted.
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3answers
669 views

Max temperature of PTC heater, need tip

I have some difficulty reading specifications for PTC heaters, more specifically the ones on here. I understand that a PTC heater does not, inherently, rise above a specific temperature. In the ...
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2answers
4k views

Polyfuse (resettable PTC) lifetime

There is a proposed design that could have a polyfuse tripping many times. Is there any lifetime to these things? Number of resets? I looked here but could find no such spec. http://www....
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1answer
2k views

Voltage detection / Universal uC Input => CLD, PTC

I'm currently developing a open-source "Home-PLC" for home automation. Every thing runs fine so far and I have a module with fixed voltage AC inputs and outputs. In the next step I want the build '...
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Can I use a 600VAC PTC resettable fuse in a 700VDC application?

I've inherited an old design, and a part used has gone out of production. This part is a PTC resettable fuse, used in a bootstrap circuit, so it's one-shot. When the PTC opens, it has ~700VDC across ...