Avnet’s ADI power supply Module adopts ADI’s ADP1850 device, which provides power for Xilinx’s 7 series FPGA, 12V voltage input, and four dual-channel ADP1850 devices provide 8-channel regulated output: 3.3V/8A, 2.5V/ 8A, 2.0V/2A, 1.8V/6A, 1.5V or 1.35V/4A, 1.2V/4A and two 1.0V/6A. The output error is 3% or 5%. This article introduces the main indicators and Features, block diagrams, circuit diagrams, bill of materials and PCB layouts.

The Analog Devices Power Module provides a proven robust design for powering Xilinx 7 series devices. Designed to meet the tolerance and sequencing guidelines set forth by Xilinx, the Analog Devices Power Module provides a highly optimized controller based design utilizing the ADP1850 dual output synchronous buck controller . The device operates in current mode for improved transient response and uses valley current sensing for enhanced noise immunity. The ADP1850 is ideal in system applications requiring multiple output voltages: the ADP1850 includes a synchronization feature to eliminate beat frequencies between switching devices; provides accurate tracking capability between supplies and includes precision enable for simple, robust sequencing. The ADP1850 provides high speed, high peak current drive capability with dead-time optimization to enable energy efficient power conversion. For low load operation, the device can be configured to operate in power saving mode (PSM) by skipping pulses and reducing switching losses to improve the energy efficiency at light load and standby conditions.

Additional flexibility is provided by external programmability of loop compensation, soft start, frequency setting, power saving mode, current limit and current sense gain can all be programmed using external components.

Figure 1. ADI Power Module Outline Drawing

ADI power module main indicators:

Main features of ADI power modules:

12V input

Eight regulated outputs (4 dual output ADP1850 devices)

3.3V @ 8A output, 5% tolerance

2.5V @ 8A output, 5% tolerance

2.0V @ 2A output, 3% tolerance

1.8V @ 6A output, 5% tolerance

1.5V/1.35V @ 4A jumper selectable output, 5% tolerance

1.2V @ 4A output, 2.5% tolerance

1.0V @ 6A output, 3% tolerance

Second 1.0 V @ 6 A output, 3% tolerance

Remote sense for greater regulation accuracy at the load on all outputs

Meets recommended start up sequencing for Xilinx 7 series devices

Vccint -> Vccaux -> Vccaux_io -> Vcco

Figure 2. ADI Power Module Block Diagram

Figure 3. ADI power module circuit diagram (1)

Figure 4. ADI power module circuit diagram (2)

Figure 5. ADI power module circuit diagram (3)

Figure 6. ADI power module circuit diagram (4)

Figure 7. ADI power module circuit diagram (4)
The ADI Power Module Bill of Materials (BOM) can be found at:

Figure 8. ADI Power Module PCB Layout (Top Layer)

Figure 9. ADI Power Module PCB Layout (Bottom Layer)
For details, see:
http://www.analog.com/static/imported-files/data_sheets/ADP1850.pdf
and
https://www.em.avnet.com/Support%20And%20Downloads/ADI%20Power%20Module%20User%20Guide_release%2001.pdf
as well as
https://www.em.avnet.com/Support%20And%20Downloads/ADI%20Power%20Module%20Schematic%20R02.pdf