Automotive Electronics
regulator is a single IC, requiring just a handful of external small signal components. Additionally, it has carefully controlled process parameters, such as current limit accuracy and current mirror ratio, which make the creation of a fault strategy, fault detection thresholds and worst case analysis, much more straightforward. The flexibility, in terms of circuit
a loop that is stable with a low cost and standard equivalent series resistance (ESR) output capacitor.
Conclusion
Next generation current sensing regulator ICs provide a simple integrated solution to power most types of external microphones in automotive audio and infotainment applications. They have the ability to
Figure 2: Devices such as ON Semiconductor's NCV47551 integrated low dropout microphone regulator reduce the number of components required for active noise cancellation and voice detection applications and has low noise, low output current performance
faulty or misassembled. As a result the possibility exists that the microphone regulator output (VOUT) could be shorted to ground, left open or, shorted to battery.
Microphone regulator benefits A typical discrete diagnosis and protection
circuit might consist of up to 20 discrete components and constitute high assembly costs, complex failure modes and effects analysis, as well as consuming valuable microcontroller resources for the carrying out of command and control functions. Conversely an integrated microphone
programmability, that is inherent in a discrete circuit design can be achieved by the microphone regulator possessing a programmable output voltage and current limit levels as well as an IC enable. The provision of accurate and adjustable output voltage regulation, including well defined limits of loop stability means that the fully protected output can be set to a target output voltage that correlates to the input requirement of the microphone, with
monitor the status of the load, thus enabling highly effective fault diagnosis. They can also provide protection from key fault conditions, should they arise.
ON Semiconductor |
www.onsemi.com
Kieran McDonald is a Staff Field Applications & Systems Engineer at ON Semiconductor
www.cieonline.co.uk
Components in Electronics
October 2014 13
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