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Static Signal Via ADuM 5230

Hi,

I am trying to transmit a static signal via ADuM 5230. I am using both the isolated and the externally powered channels. The frequency of the Input logic signal can be <200 Hz. I am observing some false triggers at the signal output of the ADuM chip. With the input logic still high, the output randomly drops to zero for ~1us and the becomes high again.(figure attached).

Is this some issue with the layout or some due to some internal function of the chip?

Isolated.TIF
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  • Hi Saad:

    I am the Applications Engineer for the isoPower products and can tell you that we have another isolated gate driver with isoPower. The product is the ADuM6132 which can output a little more output power, but will consume even more input power than the ADuM5230, even at no load on the isoPower, which is due to the ADuM6132 having an internal voltage clamp to limit the output to 18V, which causes more internal power dissipation.

    The ADuM5230 can be used in a lower power mode by reducing the isoPower duty cycle with a resistor divider connected to the VADJ pin as shown in figure 25. If you have a light load on VISO and have a light dynamic load on VISO since your input frequency is low at 200Hz, you can lower the Viso duty cycle to save power and possibly reduce the output voltage.According to figure 13 and 14, a duty cycle of about 0.2 or 0.3 can be achieved with upper/lower VADJ resistor values of 1K/9K.  You can adjust these resistor values as shown in these figures and reduce both you output voltage and your power dissipated. Note that the ADuM5230 does not have a regulated voltage so some load may be needed on VISO to reduce the voltage output even at very low duty cycle.

    Regards, Brian

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  • Hi Saad:

    I am the Applications Engineer for the isoPower products and can tell you that we have another isolated gate driver with isoPower. The product is the ADuM6132 which can output a little more output power, but will consume even more input power than the ADuM5230, even at no load on the isoPower, which is due to the ADuM6132 having an internal voltage clamp to limit the output to 18V, which causes more internal power dissipation.

    The ADuM5230 can be used in a lower power mode by reducing the isoPower duty cycle with a resistor divider connected to the VADJ pin as shown in figure 25. If you have a light load on VISO and have a light dynamic load on VISO since your input frequency is low at 200Hz, you can lower the Viso duty cycle to save power and possibly reduce the output voltage.According to figure 13 and 14, a duty cycle of about 0.2 or 0.3 can be achieved with upper/lower VADJ resistor values of 1K/9K.  You can adjust these resistor values as shown in these figures and reduce both you output voltage and your power dissipated. Note that the ADuM5230 does not have a regulated voltage so some load may be needed on VISO to reduce the voltage output even at very low duty cycle.

    Regards, Brian

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