4-channel hi-impedance injector driver

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STC
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4-channel hi-impedance injector driver

Post by STC »

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Re: 4-channel hi-impedance injector driver

Post by STC »

Image
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Re: 4-channel hi-impedance injector driver

Post by STC »

For mentioned driver you can use following enclosure:
Image
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drlow
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Re: 4-channel hi-impedance injector driver

Post by drlow »

Hello !

I'm looking to drive extra injector on my motor and this board seems very interesting.
The output from my ECU (not a secu-3 one) is 0 to +1v. Is it a sufficient voltage to drive it ? It seems the input treshold voltage is 0.5v but I'm really not sure.
In this case, are R5 & R6 1k usefull or not ?

Thanks for your help and thanks for your share

DrLow
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Re: 4-channel hi-impedance injector driver

Post by STC »

Hi,

1V is not sufficient to drive FET (even FET with logic level driving), You should boost your signal using a bipolar transistor (or something else which is able to be driven by 1V level).
In this case, are R5 & R6 1k usefull or not ?
These resistors are intended to pull up inputs to ground, which may be required for ECUs with high side outputs (SECU-3 unit has two high side outputs).
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Re: 4-channel hi-impedance injector driver

Post by drlow »

Thanks for quick reply,

Which minimum (and maximum) target voltage should I reach ?
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Re: 4-channel hi-impedance injector driver

Post by STC »

See VN14NV04 datasheet.
Input threshold voltage: min 0.5V, max 2.5V. So, input level must be at least 2.5V for correct operation of transistor.
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