Innovative CircuitsSuperpower compared to a Jung style super regulator
How does the superpower compare with a Jung style super regulator? We show comparison data for a variation created by Andrew Weekes that can be found here, referred to as ALWSR regulator. First consider these facts:
| Superpower regulator |
ALWSR regulator |
| 11 components |
22 components |
| 2 capacitors |
7 capacitors |
| 0 zeners, 0 diodes, 0 LEDs |
1 zener, 2 diodes, 1 LED |
Both devices were
tested with as nearly identical conditions as possible, with both devices
using the same input supply. Vout = 10V for both regulators.
Current was tested at 700mA with the standard Superpower device,
which begins to limit current at approximately 700mA. To allow direct
comparison, the ALWSR circuit is also tested at 700mA.
The tested ALWSR circuit does not
have the pre-regulator, and uses a D880Y pass transistor instead of a D44H11.
It requires an additional 10pF capacitor across the 499 Ohm low pass
resistor for stability as seen in a photo below; this extra capacitor is not specified for the stock ALWSR.
Superpower, 700mA pulse
Superpower
delivering 700mA into 8 Ohms. Notice the
clean, fast rise and fall of the load voltage (bottom). The top Vout
transients are quite low, a step less than 2mV that returns to DC.
A less demanding test, pulling 250mA from the Superpower, shows a
super clean load transient and an output with a very small step and
almost no transient behavior.
ALWSR, 700mA pulse
ALWSR regulator delivering 700mA. The load transient response is clean and quick with no ringing. The output has a leading spike of less than 18mV (not fully visible) and a 2mV step.
This regulator also performs well at lower currents. The thickness of the trace is due to a low level 90MHz oscillation in the circuit.
The ALWSR as tested has an instability at some load current levels as seen here. This was remedied with a 10pF capacitor across the 499 Ohm resistor that feeds the positive input of the AD797.
Belleson® has introduced a small form factor, high output current Superpower™
regulator. The new SPJ78 and SPJ17 devices are available with Vout of +3.3V, +5V
and +6.25V, at current to 2 amps.