Using AD5758 and ADP1031 solve the problem of channel segregation of analog output module of power - Simulation technology

for programmable logic controllers ( PLC controller） Or distributed control system ( DCS） Module design process control applications such as segregation of channel analog output module, the main factors are usually the channel density and the power consumption. With density increase module size shrink, channels, each channel power consumption must be reduced, to satisfy the requirement of the module maximum power consumption budget. Higher channel density of the less PCB space also means that each channel can be used.

system-level solutions

as shown in figure 1 for AD5758 and ADP1031 system solutions, they can solve the problem of power consumption and space, support to realize the integration of the higher level. This design note shows that in the manufacturing of single channel power consumption is lower than 2 W eight channel module, how to keep its small size.

ADP1031 can solve the problem of isolation and size, with 300 V power supply and data isolation, AD5758 provides low power consumption, high precision, can be configured in the current or voltage output channel.

in figure 1. AD5758 and ADP1031 8 channel circuit board.

integration, isolated power supply and data

ADI ADP1031 adopted patented I Coupler ® technology, in 7 mm x 9 mm size package integrated 3 isolation power supply rail, isolation and SPI and GPIO data. This highly integrated to help solve the problem of PCB footprint, in smaller PCB space integration and meet all channel isolation requirements.

in figure 2. ADP1031 block diagram. Low-power

AD5758 adopted dynamic power control ( DPC） Technology, when the device is configuration is used to control the output current, in the worst operating conditions, can help minimize the module's power consumption. It can continue to track the output voltage, output drive power supply to a minimum, in order to keep the output load current, these all through an integrated step-down converter, programmable and high efficiency. In the current output mode, DPC enabled, AD5758 will automatically adjust the DPC voltage, under all load conditions to minimize power consumption.

ADP1031 after optimization design, can in the worst load conditions, provide efficient isolation AD5758 current to minimize the total power consumption of the channel. ADP1031 integrating high-speed SPI channel at startup would also reduce power consumption, entering a low power consumption in the closed state.

in figure 3. AD5758 block diagram.

the flyback transformer isolation

because ADP1031 integrates the flyback channel, simplifies the design of the flyback transformer, because it only needs a single primary and secondary windings. This means that the appearance of the transformer can be smaller, while still meet the demand of efficiency and isolation. The size of the recommended ADP1031 use transformer to 8. 6毫米×8。 26 mm, height is less than 9. 7 mm。 About the recommended list of transformer, please refer to the manual ADP1031 data. Size

solution

a highly integrated makes every isolated channel can load size less than 400 was double sided PCB. This includes all passive components and isolated spacing.

support flexible diagnosis and HART connection precision channel

AD5758 integrates advanced diagnosis function, can quickly detect abnormal behavior and failure.

error is stored in the two registers signs: digital diagnosis and diagnosis results registers, respectively for diagnosis and on chip on chip digital simulation diagnosis. Some important diagnosis includes:

watchdog timer error

SPI CRC error

invalid SPI access

SCLK counter error

CRC error calibration memory

output overvoltage protection

output open circuit voltage output short-circuit fault X current error

thermal error

internal power error

DPC error

for the full list of diagnosis, please refer to the manual AD5758 data.

AD5758 also integrates a 12 bit ADC, and can provide diagnostic measure in the user's choice of node, such as internal power supply and grounding, bare chip temperature monitor and internal reference voltage source.

AD5758 has a CHART pin, HART ® signal in the form of capacitive coupling connected to this pin. Enable the HART connection, HART signal display in VIOUT pin. This feature is only available when will VIOUT configuration for the output current. EMC performance

AD5758 in all possible connection to the screw terminal ( VIOUT + VSENSE和−VSENSE) The pin used to line protection device. The line protection device by restricting internal by VDPC + and AVSS electric rail voltage, protect the pin is not affected by the positive and negative voltage of up to + / - 38 V. If detected VIOUT pin voltage exceeds this limit, the error flag setting, can be read back through the SPI port.

have AD5758 and ADP1031 system has done a lot of EMC test. Refer to table 1 and table 2 to check the test results summary.

in table 1. The electromagnetic radiation harassment performance overview

in table 2. Electromagnetic immunity performance overview

system application block diagram

in figure 4. The system connection diagram.

figure 5. 8 channel module and power supply voltage and load power consumption. Conclusion

AD5758 and ADP1031 system-level solutions support to achieve reliable and compact 8 channel ( Channel segregation) The power consumption of the analog output module, in the worst condition, all eight channels can achieve excellent low power consumption, Less than 2 W) 。

author introduction

Donal O 'Sullivan is Ireland limerick ADI company of industrial automation technology system application engineer. His research on the process control applications.

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