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TPA6139A2RGTR Scheda tecnica(PDF) 10 Page - Texas Instruments |
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TPA6139A2RGTR Scheda tecnica(HTML) 10 Page - Texas Instruments |
10 / 28 page 10 VDD Internal VDD AMP Enable 1.25 V Bandgap Comparator OPAMP Co Mute Circuit Output MUTE 9-12 V + + + - TPA6139A2 Output 3.3 V - Conventional solution TPA 6139 A 2 Solution VDD VSS GND VDD VDD/2 GND DirectPath MUTE 10 TPA6139A2 SLOS700C – JANUARY 2011 – REVISED APRIL 2016 www.ti.com Product Folder Links: TPA6139A2 Submit Documentation Feedback Copyright © 2011–2016, Texas Instruments Incorporated Feature Description (continued) Figure 9. Conventional and DirectPath Line Driver The DirectPath amplifier architecture operates from a single supply but makes use of an internal charge pump to provide a negative voltage rail. Combining the user-provided positive rail and the negative rail generated by the IC, the device operates in what is effectively a split supply mode. The output voltages are now centered at zero volts with the capability to swing to the positive rail or negative rail. Combining this with the built-in click and pop reduction circuit, the DirectPath amplifier requires no output DC- blocking capacitors. The bottom block diagram and waveform of Figure 9 illustrate the ground-referenced line-driver architecture. 9.4 Device Functional Modes 9.4.1 Internal Undervoltage Detection The TPA6139A2 contains an internal precision band-gap reference voltage and a comparator used to monitor the supply voltage, VDD. The internal VDD monitor is set at 2.8 V with 200-mV hysteresis. |
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