MS1003SH datasheet(28/41 Pages) SHINDENGEN

28 / 41 page

MS1003SH･MS1004SH

Application Note Ver.2.2

SHINDENGEN ELECTRIC MFG. CO. , LTD

28/41

(4) Setting components

1) R105 + R106

The absolute maximum rating of the Z/C pin is ±5 mA. A zener diode is mounted for protection

between the Z/C pin (Pin 1) and the GND pin (Pin 3). This diode determines the absolute maximum

current rating. Set resistance so that the current does not exceed this level.

The diagram to the right shows a model

circuit, which is a basic circuit with an

onboard protection element (zener diode)

added. I(1) and I(2) represent currents

flowing to this onboard protection element.

The current I(1) flows when the Nc coil

output is a positive voltage. I(2) flows

when the Nc coil output is a negative

voltage.

I(1) and I(2) must not exceed the absolute

maximum rating. In ordinary designs, set resistance so that these currents do not exceed 80% of the

absolute maximum rating (± 4 mA).

The following table gives formulas for calculating the resistance R105 + R106:

Resistance assuming a

positive voltage for Nc

coil

①

VCL

)

(

)

(

106

105











[Ω]

Resistance assuming a

negative voltage for Nc

coil

②

VCL









)

(

106

105

(max)

[Ω]

VCL(H) and VCL(L) are the clamping voltages of the onboard protection element, a protective zener

diode. The specification gives these values.

If the basic circuit configuration shown in Section (1) is used, I(1) flows to the D102. In this case,

formula 48 may be disregarded.

2) R106 and C108

These components set up the partial resonance period tq.

Adjust to the partial resonance troughs while monitoring actual waveforms.

Initial design value

C108

100 pF

R106

1 kΩ or greater

Onboard protection

element

I(1)

I(2)

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