Reference design cuts power, cost and size in PLC digital-input subsystems
The design reduces isolated channels and uses analog integration for industrial control and automation applications.
One method of reducing the size of I/O solutions in PLCs is to reduce the number of digital channels that need to be isolated. Integrating three Maxim products including a transformer driver, the Corona design reduces isolated channels and eliminates the need for power-hungry optocouplers and discrete parts. These savings reduce power by 16%, solution size by 38%, and cost by 23%. Maxim’s devices used in Corona are designed specifically for harsh industrial environments with operating temperature ranges from -40°C to +125°C, so they are ideal for use in PLCs and other automation applications.
The Corona reference design reduces isolation channels to four while Maxim’s digital isolator eliminates the need for optoisolators; optimized for 16, 24, and 32 input channel designs, the digital input serializer’s SPI busses can be daisy-chained to further reduce isolation channel count, leading to increased savings.
The reference design, which also offers best-in-class power consumption; using 16% less power than the traditional design approach, uses 38 fewer parts than a traditional design to create a less expensive integrated solution. The compact solution provides 51% fewer components than a traditional design
Corona’s Integrated Products include:
MAX31911: industrial, octal, digital input translator/serializer delivers best-in-class power consumption and reduces component count on the board;
MAX14850: 6-channel digital isolator enables low power consumption and stable high-temperature performance; UL1577, CSA, IEC 60747-5-2 safety certified;
Replaces optoisolators, which have limited LED lifespan, with a 5x longer life solution; and
MAX13256: 36V H-bridge transformer driver simplifies isolated power designs.
Availability and Pricing
Complete reference design is available in a 90 mm x 20 mm Pmod form factor. Pricing for Corona starts at $45. The product are now available through distribution channels.
Maxim Integrated at www.maximintegrated.com
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