AWG G3 PAD FOR PS3 Specifikace stáhnout pdf (Strana 172)

6 Device PowerSupply High Current Power Supply (HCDPS)

172 System Reference, January 2001

c. Over-temperature Protection

It is possible to add a heat or smoke sensor to the

DUT-Board in such a way, that, in the event of an

emergency, the safety_line will be pulled down

resulting in a shutdown of all HCDPS units simulta-

neously.

d. Over-voltage Protection.

Here, there are three levels of protection:

I) Programmable protection: This is set with the

Firmware command PSOP as described on

page 178. This protection can be made active (at 4

different over-voltages) or inactive. The default is

inactive (over-voltage protection off). The protec-

tion switches the HCDPS to tristate in order to

protect the DUT.

II) If the Voltage at the output of the HCDPS is more

than about 1.8V above the programmed value, three

diodes in series between the output and the regu-

lator begin to conduct and regulate voltage down to

that level.

III) If the Voltage at the output of the HCDPS rises

to more than 4.8V, a crowbar circuit short-circuits

the 12V supply voltage of the HCDPS itself.

Note: I) is the standard protection for tests, and is

slow enough not to be triggered under normal oper-

ating conditions, the protection offered by II) and

III) is normally only necessary if severe problems

occur inside the HCDPS.

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AWG G3 PAD FOR PS3 Specifikace Strana 172