How does Belleson Superpower compare with a SuperTeddyReg regulator? We compare to the voltage regulator shown here, called the SuperTeddyReg regulator. Both devices were tested with as nearly identical conditions as possible, with both devices using the same input supply and Vout nominally = 24V for both regulators (STR was 23.5V with the R2 and R3 shown below).

First, as advertised, SuperTeddyReg has excellent noise performance. However, it may be better classified as a low noise voltage reference than as a voltage regulator. A performance comparison using both LTSpice and a breadboard shows that Vout varies with load. A measurement at 700mA (see photo below) shows almost 1V change in Vout, or load regulation = 28dB. Said another way, a 700mA change in Iout results in a 4% change in Vout.

Simulation also shows that ripple increases with load, going from 22µV with a 2.4mA load to 520µV with a 602mA load. For the same conditions (Vin=30V, Vripple=1Vp-p sine wave @ 120Hz), Superpower has essentially unmeasurable ripple at 2.4mA and 5µV at 605mA.

The SuperTeddyReg built and measured (shown below) uses different JFETs and small signal NPNs from the original schematic. The components do not change the primary behavior of the SuperTeddyReg, which is governed by the an open loop topology with no feedback to keep Vout constant with load changes.

Dynamic performance was tested with a 700mA current step for both a Superpower device and the SuperTeddyReg circuit. Notice C7, which was added to prevent a low level oscillation. The test circuit was built in a fastidious way on ground plane.