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Protection Features and DC Power Sequencing

Protection Features

Check out our PSUs 101 article to learn more about PSU protection features. Our protection features evaluation methodology is described in detail here.

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Protection Features
OCP	12V: 50.6A (134.93%), 12.039V 5V: 26.1A (130.5%), 5.043V 3.3V: 27.7A (184.67%), 3.343V 5VSB: 3.4A (136%), 4.999V
OPP	622.9W (138.42%)
OTP	✓ (140°C @ Secondary side)
SCP	12V: ✓ 5V: ✓ 3.3V: ✓ 5VSB: ✓ -12V: ✓
PWR_OK	Accurate (but lower than 16ms)
NLO	✓
SIP	Surge: MOV Inrush: NTC thermistor & bypass relay

The OCP triggering points on every rail except for the 3.3V one are properly configured. Because of the 3.3V rail's low nominal capacity, OCP's percentage is too high. Ripple stays in control though, as does load regulation.

OPP is set at around 138.5%, which allows the PSU to deliver more than 620W of load before shutting down. We usually ask for 130% above the nominal capacity, but because this is a low-capacity and well-built power supply, we don't have a problem with its higher OPP. It'll have no problem coping with the power spikes that many high-end graphics cards generate.

Short circuit protection is present on all rails, as expected, and the power-good signal is accurate. However, it doesn't exceed 16ms as the ATX spec demands.

DC Power Sequencing

According to Intel’s most recent Power Supply Design Guide (revision 1.4) the +12V and 5V voltages must be equal to or greater than the 3.3V rail’s output during power-up and normal operation.

For our first measurement, we turn the PSU off and switch it back on without load on any of its rails. In the second test, we set the PSU to standby mode, dial in a full load, and start the PSU. In the last test, with the PSU switched off, we dial in a full load before restoring power.

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