ADP1031 maximum output current

Question

Hello, 
 I'm planning to use the ADP1031 for realizing an isolated analog output. However I have difficulties to reach the needed output current IVOUT1(MAX) of 30mA 
 I want to use following values: 
 VINP=6V or 24V 
 VOUT1=15V 
 VOUT2=5V 
 VOUT3=-15V 
 LPRI=280&micro;H 
 Using above values and interim results from other formulas in the datasheet, I calculate following values with the formula on page 32: 
 IVOUT1(MAX)=14,1mA for VINP=6V and 20,1mA for VINP=24V 
 Both are considerably below the needed 30mA. Can you help me to increase IVOUT1(MAX) or is the part not suited for such a output current?

jeco · Accepted Answer

Hi MrkBldn, 
 For the given conditions: 
 VINP=6V or 24V, VOUT1=15V, VOUT2=5V, VOUT3=-15V 
 LPRI=280&micro;H (I assume this is the default transformer 750316743). 
 Yes, you can compute for the maximum output power using the equation on page 32 to get the approximate max output value but the actual results may vary due to the tolerances and the efficiency number for the given condition. 
 You can look at figure 23 to the typical maximum output current for various output and VINP levels. 
 
 Take note the this max IOUT value is for VOUT1 and NO load in VOUT2 and VOUT3. Also take that this is measure at the 70% of the current limit threshold to account for different variability like the tolerances and part to part variation. 
 Based from figure 23, you can get a bit more than 40mA on VOUT1 with 6V VINP and about 90mA IOUT1 with VINP of 24V. 
 Thanks and regards, 
 Jefferson)

jeco · Answer

Hi Mark, 
 Yes, you can take max IOUT1 values from figure 23 since you will be using the same transformer. May i know what will be your load on VOUT2 and VOUT3? The Buck and the Inverting buck-boost are powered from VOUT1 so you need to account for their input currents as additional load for VOUT1. 
 Thanks, 
 Jefferson

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ADP1031 maximum output current

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