Washing Machine: Low-End

Washing Machine: Low-End Solutions from Texas Instruments

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Design Considerations

In contrast to state-of-the-art "high-end" appliances, low-end appliances prioritize function over features to achieve rigorous cost objectives. TI provides traditional 5 V analog and logic commodity devices to meet this demand, as well as devices integrating relay drivers, zero-volt detection, brown-out detect, and 5 V linear regulation, which allow for keeping BoM (bill of materials) costs within budget.

5 V Logic and Analog: Texas Instruments provides the largest portfolio in the commodity space that gives designers the flexibility to choose from any logic function needed. Whether it’s an AND gate or a single-bit buffer that is needed on the board, TI has it. Likewise, TI offers a wide selection of standard linear devices for regulation (linear regulators), relays (relay drivers), signal conditioning (operational amplifiers), etc that are available in industrial temperature range.

Integration: Texas Instruments provides fully-integrated solutions such as the digital signal controllers (for digital motor control, PFC, and other system functions), and relay drivers that provide up to 8 channels, zero-volt detection, and 5 V linear regulation. Aside from the commonly-used 7 bit relay drivers (such as the ULN2003A Darlington arrays) TI also provides the 8 bit TPL9201 or TPL9202 to drive relays for water and drain valves, and triacs that may be used to turn the electric motor ON/OFF. These devices also have integrated features that allow for the detection of the zero-volt crossing of the secondary side of the power transformer. Information is fed back to the microcontroller that lets it know when to switch ON/OFF the relays for better long-term reliability of the relays themselves. A brown-out detect feature that provides an early notification in case of a decrease in power supply voltage is available on the TPL9202. These devices also carry an on-chip 5 V linear regulator to power 5 V logic or microcontrollers that may reside on the board.

Application Notes (3)

Title Abstract Type Size (KB) Date Views
HTM 9 KB 21 Sep 2009 2205
HTM 8 KB 19 Aug 2008 1901
HTM 8 KB 12 May 2003 1339
    

Selection and Solution Guides

Selection Guides (1)

Title Abstract Type Size (KB) Date Views
PDF 4.16 MB 23 Jul 2009 5390

Solution Guides (2)

Title Abstract Type Size (KB) Date Views
PDF 5.83 MB 26 Jan 2014 12489
PDF 11.09 MB 19 Jun 2013 4215

Product Bulletin & White Papers

White Papers (2)

Title Abstract Type Size (MB) Date Views
PDF 179 KB 20 Apr 2012 2921
PDF 379 KB 21 Jan 2008 880

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