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ADM1270 stability during Current limit Switch over

Hi,

We are planning to design a 28V fixed power supply with adjustable current limit setting using ISET pin of ADM1270 IC in discrete steps,need to know information on how stable the device will perform,during change over from one discrete current limit step to another on the go without power OFF .

Our concern is, when the switch over takes place,the ISET pin will be left floating for some momentary period,will this create problems. If so we would like know about some recommendations to be carried out for safely using ADM1270 IC in our design.

Regards,

Harish.S

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  • Hi Harish,

                   what this spec means is that for VCC > 14 V, but less than 60 V, the gate voltage will be clamped between 10 V

    and 14 V so  the the FET will never see a |VGS|  greater than this clamp value. If VCC is less than 14 V then the clamp is

    not active and GATE pin will be at the lowest possible voltage which is GND so that the VGS applied to the FET is equal to VCC.

    To answer your specific question, in the case of VCC = 5 V the VGS the FET will be ~5 V.

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  • Hi Harish,

                   what this spec means is that for VCC > 14 V, but less than 60 V, the gate voltage will be clamped between 10 V

    and 14 V so  the the FET will never see a |VGS|  greater than this clamp value. If VCC is less than 14 V then the clamp is

    not active and GATE pin will be at the lowest possible voltage which is GND so that the VGS applied to the FET is equal to VCC.

    To answer your specific question, in the case of VCC = 5 V the VGS the FET will be ~5 V.

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