Introduction of Temperature/DC Bias Modeland User-specified Temp./Bias Model
Multilayer Ceramic Capacitors (High dielectric type)
Power Inductors

Introduction
We are providing models that reflect the temperature and DC bias dependenciesof capacitors and inductors!

Temperature/DC Bias Model
IC

Available for various temperature and DC bias

User-specified Temp./Bias Model@85℃, 2VIC

IC
@40℃, 0.2A

@40℃, 0.2A

@40℃, 1.2V

@85℃, 0.1A
@85℃, 0.8V

You can specify the temperature and DC bias corresponding to your environment
when downloading the model.
2Model variations and features
Temperature/DC Bias
Model

New User-specified
Temp./Bias Model

Standard Model

Images𝐶 = 𝑓(𝑉DC , 𝑇)
𝐿 = 𝑓(𝐼DC , 𝑇)

@85degC, 2V @40degC, 0.2A@-55degC, 1V

etc.

25degC, 0V only

Temperature

Changeable(specify on schematic)

Fixed (specify@DL)
ex. -55, 25, 85℃

Fixed（25degC only）

DC BiasAutomatically following toapplied DC bias

Fixed (specify@DL)
ex. 0, 2, 4V/A

Fixed（0V/A only）

Simulation
Accuracy/
SpeedHigh accuracy/
Relatively slow

Normal accuracy/
FastNormal accuracy/
Fast

We are providing 2 types of adaptive models to temperature and dc bias
dependencies of high dielectric ceramic capacitors and power inductors.
3

Download pagehttps://ds.yuden.co.jp/TYCOMPAS/or/searcherMain

SpecifyTemp./
BiasDownload

You can download models by following the download link at description pageof each product.
4

Download page of Libraries and manuals
If you would like to download models of our components all at once, please visit
the library download page below.
https://www.yuden.co.jp/or/product/support/com_lib/
Also, how-to-install-and-use manuals for Temperature/DC bias model are available
from links below.
PSpicehttps://www.yuden.co.jp/productdata/com_lib/en/PSM_E.pdf
LTspicehttps://www.yuden.co.jp/productdata/com_lib/en/LTM_E.pdf
HSPICEhttps://www.yuden.co.jp/productdata/com_lib/en/HSM_E.pdf
Spectrehttps://www.yuden.co.jp/productdata/com_lib/en/SPM_E.pdf
5More Informations ofTemperature/DC bias Model6Temperature/DC Bias Characteristics of Capacitors
Multilayer Ceramic Capacitor 47uF
DC Bias Characteristics (120Hz)

Temperature Characteristics (120Hz)

Multilayer ceramic capacitors composed of high dielectric materials are
known to vary their characteristics by temperature and/or DC bias voltage.
Therefore, temperature-DC-bias-dependent models are needed to perform
simulations more precisely in condition that the ambient temperature and/or
DC bias voltage varies.
7Temperature/DC bias model and measurement data
Multilayer Ceramic Capacitor 47uF
Frequency Characteristics

By using Temperature/DC bias model, you can perform simulations well fitting
to actual data dependent on the ambient temperature and DC bias current.
That is first achieved by Temperature/DC bias model, but not realized by thelegend model.
8Simulation example (DC-DC converter)
Multilayer Ceramic Capacitor 47uF
Input Voltage

5V

Output Voltage

3V

Output Current

0.3A

Switching Frequency

100kHzTemperature

85degC
Measuring point

Temperature/DC bias
model

Legend model
Temperature/DC bias model

Above figures are ripple waveforms of output capacitor when using
Temperature/DC bias model in DC-DC converter circuit. You can find that thewaveform of Temperature/DC bias model is more actual as it reflects the reductionof capacitance according to DC bias voltage different from the legend model.
9Temperature/DC Bias Characteristics of Inductors
Ferrite Power Inductor 1uH
DC Bias Characteristics (1MHz)

Temperature Characteristics (1MHz)Power Inductors composed of ferrite or metal materials are known to vary
their characteristics by temperature and/or DC bias current.
Therefore, temperature-DC-bias-dependent models are needed to perform
simulations more precisely in condition that the ambient temperature and/orDC bias current varies.
10Temperature/DC bias model and measurement dataFerrite Power Inductor 1uH
Frequency Characteristics (25C)

Measurement

Frequency Characteristics (0.15A)

Temperature/DC bias model

By using Temperature/DC bias model, you can perform simulations well fitting
to actual data dependent on the ambient temperature and DC bias current.
That is first achieved by Temperature/DC bias model, but not realized by thelegend model.
11Simulation example (DC-DC converter)
Ferrite Power Inductor 1uH
Input Voltage

5V

Output Voltage

2V

Output Current

1.5A

Switching Frequency

4MHz

Temperature

125degC

Measuring point
Temperature/DC bias
model

Legend model
Temperature/DC bias model

Above figures are inductor waveforms when using Temperature/DC bias model in
DC-DC converter circuit. You can find that the waveform of Temperature/DC bias
model is more actual as it reflects the reduction of inductance according to DC bias
current different from the legend model.
1213