Can I use a Zener diode to power TPL1401? Do you have an example?
Yes, it is possible to supply the TPL1401 with a Zener diode. The voltage of the Zener would need to be in the 1.8V to 5.5V supply range of the TPL1401.
When designing the power supply circuit, pay close attention to the specifications of the Zener diode you choose. There will be a minimum current that needs to be met for the diode to operate in reverse breakdown, and a maximum power rating. The diode for this example has a voltage of 5.1V and a minimum current of 5mA. To be safe, allow at least 1.5mA of current to power the TPL1401. 1.5mA plus the 5mA needed for the Zener means that 6.5mA needs to be sourced from the 15V supply. For this reason, a 1.52kΩ resistor was chosen to limit the current.
For best accuracy, use the on-board precision reference instead of using VDD as a reference. Enable the internal reference by writing a 1 to the REF_EN bit of the GENERAL_CONFIG register. A gain to the internal reference can also be applied by writing to the OUT_SPAN bits of the GENERAL_CONFIG register.
(Register table taken from TPL1401 datasheet version * Sept 2020)
The TPL1401 can be found in many common applications:
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End equipment |
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Exit and emergency lighting |
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Barcode scanners |
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Barcode readers |
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Smart speakers |
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Video doorbells |
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Cordless vacuum cleaners |
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Robotic lawn mowers |
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Laser distance meter |
You can find some additional information about the TPL1401 here:
You can find more information about precision DACs here:
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Precision DAC Learning Center |
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TI Precision Labs - DACs |
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Data Converter Circuit Cookbook |
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