ADP5070 negative output not working

Thread Starter

nadirEatsKoukies

Joined Dec 11, 2020
17
Hi guys,

I've been trying to recreate the circuit, converting a 5V supply to 15V and -15V outputs, that I got directly from the datasheet of the ADP5070. Here it is below:
1613471187580.png
and here is my circuit on LTSPICE:
1613471383203.png
The positive output works fine but the negative not as much so:
1613471253663.png
I was expecting a -15V output on VNEG but for some reason, it's stuck on 0V.
I've attached my asc file if you wanna have a look :)
 

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crutschow

Joined Mar 14, 2008
27,188
Here's the device simulation giving outputs of ±15V.
I modified the macromodel's test fixture R1 and R4 values to give the desired voltage (right-click on U1 icon and left-click Open this macromodel's test fixture).

Not sure why the TS's schematic didn't work (although R1 and R4 resistances seem rather high). :confused:

1622227980612.png

1622228548343.png
 

ronsimpson

Joined Oct 7, 2019
1,227
I tried the circuit from post #1 and can not get the negative half to work.
I tried the circuit that came with LTSPICE and it works. ADP5070.asc
---edited----
Changed the values of R4/R5 and it works. Like Crutschow said.
 
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