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Protection Features & 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: 91.2A (128.63%), 11.922V 5V: 31.2A (141.8%), 4.976V 3.3V: 33.6A (152.7%), 3.263V 5VSB: 4.1A (136.67%), 4.882V
OPP	1110.1W (130.6%)
OTP	(>200°C @ 12V heat sink)
SCP	12V: ✓ 5V: ✓ 3.3V: ✓ 5VSB: ✓ -12V: ✓
PWR_OK	Operates properly
NLO	✓
SIP	Surge: MOV Inrush: -

Over-current and over-power protection at +12V and 5VSB are set properly. Moreover, OCP on the minor rails is configured as we'd expect.

We heated up the the TPG-850AH3FSGR's secondary side, but couldn't get it to shut down. Either the PSU doesn't have OTP or it's set too high, rendering the feature useless.

Thermaltake does include surge protection, but provides nothing to protect against large inrush currents.

DC Power Sequencing

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

For our first measurement, we turn the PSU off and switch it back on without any load on its rails. The second test involves setting the PSU to standby mode, dialing in a full load, and starting the PSU. In the last test, while the PSU is completely switched off, we dial in a full load before restoring power.

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