Industrial Ethernet Power Solution Using XRP7714 Quad-Channel, High-Current Programmable Power Management System
This reference design is a complete six-output power system designed to power a Xilinx Zynq-7020 All Programmable (AP) SoC and associated DDR3 memory in Industrial Ethernet applications. This reference design is focused on Industrial Ethernet applications leveraging HMS’s Anybus IP on Xilinx. Although the power requirements of the core system building blocks remain relatively constant, the flexibility of Exar’s Universal PMICs provides a power solution that can power the wider system requirements, whether a motor control board or human interface module.
The six output power system provides VCCPINT 1.0V, VCCINT and VCCBRAM 0.95V, VCCO_DDR programmable to 1.2/1.35/1.5V, VTT 0.60/0.675/0.75V, 1.8V for Aux and PLL and VCCO programmable from 1.8V to 3.3V. The entire power system fits in one square inch. The order and ramp rates for each supply are programmed to accommodate Zynq-7020 sequencing requirements. All power supply operations can be controlled over an I2C interface. Faults, output voltages and currents can also be monitored. Three GPIO signals are available and can be programmed to provide the status of power good signals, enables, and faults. In many cases VCCPINT, VCCINT and VCCBRAM can be combined into a single 1.0V rail and the power system can be reduced to five outputs. The six and five output boards are supported by PowerArchitectTM 4.x and connects to the Exar Communications Module (XR77XXEVB-XCM-V80).
Exar Corporation Universal PMICs with Programmable Power technology provide the performance, integration and advanced power and energy management features required to interface with any Xilinx Zynq-7000 All Programmable SoC family of FPGAs. The solution showcases Exar’s XRP7714, a quad-output programmable power management system with a built-in LDO for standby power and GPIOs. This device provides a complete power management system solution in one IC and is fully programmable via an I2C serial interface. Independent Digital Pulse Width Modulator (DPWM) channels regulate output voltages and provide all required protection functions such as current limiting and over-voltage protection. For customers looking to provide a solution from input voltage supply ranges greater than 25V, this design can easily be migrated to the 40V capable XR77129.
|Exar Device||Vin Range||Vout Range||Gate Drive Pull Up/Down||IQ (µA)||Package Type||Junction Temperature Range|
|XRP7714||4.75V – 25V||0.9V – 5.1V||6ohm / 3ohm||9mA||TQFN-40||-40°C to 125°C|
|XRP77129||5V – 40V||0.6V – 5.5V||4ohm / 2ohm||4mA||TQFN-44||-40°C to 125°C|