Amptek X-123 Benutzerhandbuch - Seite 17
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Seite drucken6.2. Power Interface
6.2.1.
A schematic illustrating the circuit at the power input is shown below. The PWR_IN line goes
through a protection circuit, then to different switching power supplies in parallel. Five of these are
located on the DP5, five on the PC5. Each has a 4.7
as applied, while others are under control of the microprocessor.
6.2.2.
Schematic of power supply architecture.
6.2.3.
6.3.
Protection: The protection device protects against reverse input polarity and has over- and under-
voltage lockouts. The X-123 will not power on with an input voltage below 3.8 V or above 5.5 V. The input
protection network operates over the range of -40 V to +60 V. Beyond this range, damage to the X-123
will occur1.
6.3.1.
This applies to X-123s from 2016 or later. Earlier X-123s contained a DP5 Rev C (or earlier),
which did not have the over- and under-voltage protection (this was added to the DP5 Rev D.) An input
voltage higher than 5.5 V may damage these units. The earlier DP5s did have reverse polarity
protection.
6.4.
Grounding: The chassis ground of the X-123, which is tied to the box and to the other boards, is
connected to the return current pins in the power connector.
X-123 User Manual
F input capacitor. Some turn on as soon as power
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