The exposed feedback pin, FB, is the feedback path for the internal output buffer.
The exposed feedback pin is beneficial in some applications.
In the circuit below, the TPL1401 used as a programmable comparator. The comparator threshold is set within the device, and the feedback is used as the signal input.
In the next example, the TPL1401 is used to create a bias point for an LED. The feedback pin connects to the source of the MOSFET which allows the TPL1401 to compensate for the gate-to-source voltage drop and the drift of the MOSFET.
If this pin is not used, it is important to short the feedback pin to the output so that the buffer is operational.
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 |
