Power Distribution Schemes - PCIe products
Introduction
The power distribution scheme of a Coaxlink PCIe product has two distinct distribution networks:
| ● | The main power distribution network |
| ● | The auxiliary power distribution network |
Main power distribution network
The main power distribution network delivers power to all the on-board electronic devices including FPGA, memory chips, CoaXPress transceivers, I/O drivers and receivers, fan motor.
The network is fed by the Host PC motherboard through the +3.3 V and the +12 V power rails of the PCI Express slot connector. Protection fuses inserted at the input side of each power rail prevent potential fire hazards.
The board status LED reflects the global status of all the power converters of the main distribution network.
Auxiliary power distribution network
The auxiliary power distribution network delivers power to the external devices including:
| ● | CoaXPress cameras using the PoCXP capability available on all connections of the CoaXPress Host connector |
| ● | System devices using the +12 V power output available on all I/O connectors |
The network is fed by a 12 V external power supply attached to the auxiliary power input connector using a power cable terminated by a 6-pin PEG plug connector. A protection fuse inserted at the input side prevents potential fire hazards.
A 24-volt DC power converter provides power to each camera connection through a PoCXP transmitter unit. Each PoCXP transmitter unit implements an electronic fuse/switch. A PTC inserted at the input of each transmitter unit prevents potential fire hazards.
The +12 V power is distributed from a common electronic fuse to all the I/O connectors. A PTC inserted at the input of prevents potential fire hazards.
The CoaXPress LEDs reflect the state of each CoaXPress host connection.
The following auxiliary power distribution network status are reported to the application:
| ● | Presence of a PEG cable and a PEG compliant power supply |
| ● | Valid 12 V voltage measured after the 12 A fuse. |
| ● | 24 V DC power converter status |
| ● | Output current and output voltage of each PoCXP transmitter |
| □ | The fuses are not serviceable! When blown, the card must be returned to the factory. |
| □ | PTCs and electronic fuses are self-resettable fuses. |
| □ | The Coaxlink card can be operated without applying power to the auxiliary power distribution network. |