Power Supply Roundup: Part II

Efficiency

The Tagan power supply has a very high level of efficiency, not dropping below 85%. The highest value of 88% is achieved at medium load. Only when the load is very low—our fictitious Low Power System with a 35 watt loss—does the efficiency drop below 65%.

The Tagan unit does not do so well in standby mode, though. Without load, the power supply draws 1.58 watts from the power source, and if the power supply is loaded with 500 mA on the standby rail, it takes 4.70 watts. Here, the efficiency is barely over 50%.

Unfortunately, the SuperRock appears to be one of those products that is enjoying plenty of popularity overseas, but isn’t yet available to North American customers.

Tagan SuperRock TG680-U33II

The Tagan SuperRock power supply is a quiet unit featuring modular connection cables.

• Positive
• Negative

• High efficiency under load
• Non-modular designLow efficiency in standby mode