Murata Chip PTC Thermistor Output Voltage Simulator (WEB)

Chip PTC Thermistor Output Voltage Simulator (Ver.1.0.0)

1. Introduction
　1.1. What is the Murata Chip PTC Thermistor Output Voltage Simulator?
　1.2. System Requirements
　1.3. Key Features

2. How to Use
　2.1. Screen Layout
　2.2. Description of Symbol


3. Software
　3.1. Accessing the Murata home page for detailed product information
　3.2. Link to our reference form 
　3.3. The new version check of this software


4. Reference Material
　4.1. Specifications of PTC Thermistor (PRF series)
　4.2. Standard Figures

1. Introduction

1. 1. What is the Murata Chip PTC Thermistor Output Voltage Simulator?

The Murata Chip PTC Thermistor Output Voltage Simulator is software for simulating the temperature characteristics of the output voltage of our PTC Thermistors; PRF series for Overheat Sensing.

The output voltage characteristics and output voltage error shown under the specified circuit conditions are displayed using simple charts. It would be useful to select a suitable part number from PRF series or to find out the best circuit parameters.

1. 2. System Requirements

• Monitor resolution: 800 x 600 or more
• Colors: 256 or more
• Memory: 32MB or more
• CPU: Pentium or higher
• Operating system: Microsoft (R) Windows (R) 95/98, Windows NT (R) 4.0, Windows (R) 2000, Windows (R) XP, Windows (R) Vista

1.3. Key Features

Applying a constant input voltage (Vcc) to a fixed resistor (R1) and to one or more PTC Thermistors (PTCs) in series, the output voltage (Vout) characteristics with temperature is simulated. See left Figure 1.

2. How to use?

2. 1. Screen Layout

See below Figure 2.

The simulator works by the following three steps, witch shows in the blue colored frames.

• Input simulation conditions
• Select part number of PTC Thermistor (・Display features of PTC selected)
• Start simulation (・Display simulation result)

Data and charts in the red colored frames are displayed automatically.

2. 2. Description of Symbol

Tables below show the descriptions of each symbol displayed on the screen

Table 1-1. Input Conditions

Symbol		Description
Temp_L		Lower limit of temperature range
Temp_H		Higher limit of temperature range
Ambient Temp.		Ambient temperature
Number of PTC		Number of PTC Thermistors in series
Vcc	Vcc	Applied (input) voltage to R1 and PTCs
	Tolerance	Tolerance of Vcc
	TC Vcc	Temperature coefficient of Vcc
R1	R1	Resistance of fixed resistor
	Tolerance	Tolerance of R1
	TC R1	Temperature coefficient of R1

Table 1-2. Features of PTC Thermistor, selected

Symbol		Description
Part Number	Part Number	Part number of PTC Thermistor, which selected from the above dialog box.
	R25	Resistance at 25 deg.C
	Tolerance	Tolerance of R25
Sensing Temp.1	Sensing Temp.1	Temperature when the PTC Thermistor reaches a specified resistance.
	Resistance	The specified resistance
	Temp.	Center value of Sensing Temp.1
	Tolerance	Tolerance of Sensing Temp.1
Sensing Temp.2	Sensing Temp.2	Temperature when the PTC Thermistor reaches a specified resistance.
	Resistance	The specified resistance
	Temp.	Center value of Sensing Temp.2
	Tolerance	Tolerance of Sensing Temp.2

Table 1-3. Simulation Result

Output Voltage (Vout)	Vout	Output voltage from the shown on ‘Circuit Model’
	Vout_Min	Minimum output voltage simulated
	Vout_Max	Maximum output voltage simulated
Threshold Voltage (Vth)	Vth	An example of threshold voltage to detect a specified temperature from Vout
	Vth_Sensing1	Threshold voltage at Sensing Temp.1
	Vth_Sensing2	Threshold voltage at Sensing Temp.2
Margin (ΔV)		Deference between Vout_Max and Vth_Sensing1 or between Vout_Max and Vth_Sensing2 [ ΔV=Vth-Vout_Max ]
ΔV at Ambient Temp.	ΔV at Ambient Temp.	ΔV at ambiet temperature
	Min	Minimum ΔV simulated
	Max	Maximum ΔV simulated
Sensing Temp. at Vth	Sensing Temp. at Vth	Temperature of PTC Thermistor when Vout is equal to the Vth
	Min	Minimum Sensing Temp. simulated
	Max	Maximum Sensing Temp. simulated

3. Software

3. 1. Accessing the Murata home page for detailed product information

3.2. Link to our reference form

This function is available in case when your PC is connected to the Internet.

Select “Help“ - “Contact Us“ on the menu bar, it links to our reference page.
We are looking forward to receiving your question and your demand about this design tool software.

3.3. The new version check of this software

This function is available in case when your PC is connected to the Internet.
Select “Help“ - “Version Check“ on the menu bar, it links to this software's introduction page. So you can check latest version of this software.

4. Reference Material

4. 1. Specifications of PTC Thermistor (PRF series)

Table 3. Specifications of PTC Thermistor (PRF series)

P/N	Resist. (R25)		Sensing Temp.1			Sensing Temp.2
	Center [Ω]	Tol. [%]	Resist. [kΩ]	Temp. [deg.C]	Tol. [deg.C]	Resist. [kΩ]	Temp. [deg.C]	Tol. [deg.C]
PRF15BC471QB#RC	470	50	4.7	105	5
PRF15BB471QB#RC	470	50	4.7	115	5
PRF15BA471QB#RC	470	50	4.7	125	5
PRF18BG471RB#RB	470	50	4.7	65	3	47	80	7
PRF18BG471QB#RB	470	50	4.7	65	5	47	80	7
PRF18BF471RB#RB	470	50	4.7	75	3	47	90	7
PRF18BF471QB#RB	470	50	4.7	75	5	47	90	7
PRF18BF471RB#RB	470	50	4.7	85	3	47	100	7
PRF18BF471QB#RB	470	50	4.7	85	5	47	100	7
PRF18BF471RB#RB	470	50	4.7	95	3	47	110	7
PRF18BF471QB#RB	470	50	4.7	95	5	47	110	7
PRF18BF471RB#RB	470	50	4.7	105	3	47	120	7
PRF18BF471QB#RB	470	50	4.7	105	5	47	120	7
PRF18BF471RB#RB	470	50	4.7	115	3	47	130	7
PRF18BF471QB#RB	470	50	4.7	115	3	47	130	7
PRF18BF471QB#RB	470	50	4.7	125	5	47	140	7
PRF18BF471QB#RB	470	50	4.7	135	5	47	150	7
PRF18AS471QB#RB	470	50	4.7	145	5
PRF21BE471QB#RA	470	50	4.7	85	5
PRF21BD471QB#RA	470	50	4.7	95	5
PRF21BC471QB#RA	470	50	4.7	105	5
PRF21BB471QB#RA	470	50	4.7	115	5
PRF21BA471QB#RA	470	50	4.7	125	5
PRF21AR471QB#RA	470	50	4.7	135	5
PRF21AS471QB#RA	470	50	4.7	145	5

4.2. Standard Figures

E3
1.0  2.2  4.7

E6
1.0  1.5  2.2  3.3  4.7  6.8

E12
1.0  1.2  1.5  1.8  2.2  2.7
3.3  3.9  4.7  5.6  6.8  8.2

E24
1.0  1.1  1.2  1.3  1.5  1.6
1.8  2.0  2.2  2.4  2.7  3.0
3.3  3.6  3.9  4.3  4.7  5.1
5.6  6.2  6.8  7.5  8.2  9.1

E96
1.00  1.02  1.05  1.07  1.10  1.13
1.15  1.18  1.21  1.24  1.27  1.30
1.33  1.37  1.40  1.43  1.47  1.50
1.54  1.58  1.62  1.65  1.69  1.74
1.78  1.82  1.87  1.91  1.96  2.00
2.05  2.10  2.15  2.21  2.26  2.32
2.37  2.43  2.49  2.55  2.61  2.67
2.74  2.80  2.87  2.94  3.01  3.09
3.16  3.24  3.32  3.40  3.48  3.57
3.65  3.74  3.83  3.92  4.02  4.12
4.22  4.32  4.42  4.53  4.64  4.75
4.87  4.99  5.11  5.23  5.36  5.49
5.62  5.76  5.90  6.04  6.19  6.34
6.49  6.65  6.81  6.98  7.15  7.32
7.50  7.68  7.87  8.06  8.25  8.45
8.66  8.87  9.09  9.31  9.53  9.76

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Murata Chip PTC Thermistor Output Voltage Simulator (WEB)