Data Sheet

15

Rev. 1.0, 2015-03-12

TLS710B0

Application Information

6

Application Information

6.1

Application Diagram

Figure 4

Application Diagram

6.2

Selection of External Components

6.2.1

Input Pin

The typical input circuitry for a linear voltage regulator is shown in the application diagram above.

A ceramic capacitor at the input, in the range of 100 nF to 470 nF, is recommended to filter out the high frequency

disturbances imposed by the line e.g. ISO pulses 3a/b. This capacitor must be placed very close to the input pin

of the linear voltage regulator on the PCB.

An aluminum electrolytic capacitor in the range of 10 µF to 470 µF is recommended as an input buffer to smooth

out high energy pulses, such as ISO pulse 2a. This capacitor should be placed close to the input pin of the linear

voltage regulator on the PCB.

An overvoltage suppressor diode can be used to further suppress any high voltage beyond the maximum rating

of the linear voltage regulator and protect the device against any damage due to over-voltage above 45 V.

The external components at the input are not mandatory for the operation of the voltage regulator, but they are

recommended in order to protect the voltage regulator against external disturbances and damages.

6.2.2

Output Pin

An output capacitor is mandatory for the stability of linear voltage regulators.

The requirement to the output capacitor is given in “Functional Range” on Page 6. The graph “Output

Capacitor Series Resistor ESR(CQ) versus Output Current IQ” on Page 10 shows the stable operation range

of the device.

TLS710B0 is designed to be stable with extremely low ESR capacitors. According to the automotive requirements,

ceramic capacitors with X5R or X7R dielectrics are recommended.

The output capacitor should be placed as close as possible to the regulator’s output and GND pins and on the

same side of the PCB as the regulator itself.

Load

e. g.

Micro

Controller

XC22xx

GND

Regulated Output Voltage

Supply

100nF

10µF

<45V

1µF

(ESR <5Ω)

Bandgap

Reference

GND

Q

I

Current

Limitation

Temperature

Shutdown

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