Post Go back to editing

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

Parents
  • Hi Donald,

         Thanks for the reply, actually we are designing a bench top fixed voltage output supply with user configurable current limit. User will be allowed to change the current limit as required using a rotary switch available at the panel ,as the user turns the knob the  Resistor between  ISET and GND will be changed as per user current limit selection, it is possible that the user does it without powering down the system.

    During the period when the knob is turned to other positions,the bottom resistor will not be connected to ISET pin for a momentary period, we would like to know about the impact during this condition.

            Since we have not started drafting our Sch,attached a image of the application circuit from datasheet explaining the scheme that is planned for implementation, showing some of the discrete current limit steps planned.

    Regards,

    Harish.S

Reply
  • Hi Donald,

         Thanks for the reply, actually we are designing a bench top fixed voltage output supply with user configurable current limit. User will be allowed to change the current limit as required using a rotary switch available at the panel ,as the user turns the knob the  Resistor between  ISET and GND will be changed as per user current limit selection, it is possible that the user does it without powering down the system.

    During the period when the knob is turned to other positions,the bottom resistor will not be connected to ISET pin for a momentary period, we would like to know about the impact during this condition.

            Since we have not started drafting our Sch,attached a image of the application circuit from datasheet explaining the scheme that is planned for implementation, showing some of the discrete current limit steps planned.

    Regards,

    Harish.S

Children
No Data