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Hello

We would like to know that a current from Viso of ADuM6211 meets VDD2 of ADuM6211 and VCC of ADM3101E.

We will use thme at below condition.

Condition

ADuM6211: ( 3.3V supply at primary and sencondary)

We think below from description of datasheet.

Is it correct ?

power supply current : 2.3 mA  Max

power supply current : 7mA Max

So needed current is 2.3+7=9.3mA

Current from Viso of ADuM6211 is 20mA max at VDDp 77mA.

But, current needed by load capacitance is described in ADM3101E datahseet rev.C P.6 Figure 9.

So if load capacitance is over about  800pF  ( we think about 11mA at 800pF from Figure9)

the current from Viso can not meet VDD2 of ADuM6211 and VCC of ADM3101E.

Generally, 20feet of cable length is 1000pF.

So the cable lenght which we can use 16 feet max ( 20feet * 800pf/1000pf = 16 feet).

If there is any wrong with our understanding, please let me know it.

Regards,

Teruamsa

Parents
• Hello RAnslow,

It is difficult for customer to add 5V supply for isolated DC-DC  only,

so I am introducing ADuM6201 which can supply 40mA at 3.3V supply.

Best Regards,

Terumasa

• Hello RAnslow,

It is difficult for customer to add 5V supply for isolated DC-DC  only,

so I am introducing ADuM6201 which can supply 40mA at 3.3V supply.

Best Regards,

Terumasa

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