15v Bipolar Supply Testing

Here’s some testing of the first bipolar supply for the Rigol scope. This is the +/-7.5v supply.

Bipolar Supply
Bipolar Supply

Above is the supply built with it’s output filtering. The modules used are a PTN78020W for the positive rail & a PTN78060A for the negative rail.

Under a 1A load across the total 15v output, here’s some scope traces of the ripple on the supply:

+7.5v Rail
+7.5v Rail

Here’s the ripple on the +7.5v rail of the supply, there’s about 75mV of total ripple.

-7.5v Rail
-7.5v Rail

And here’s the -7.5v rail, the ripple on this is slightly lower, at about 50mV. This should be more than satisfactory as the scope has onboard linear regulation after the switching supply.

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