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TPA3112D1QPWPRQ1 데이터시트(PDF) 11 Page - Texas Instruments |
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TPA3112D1QPWPRQ1 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 32 page PWM Logic Gate Drive PVCC PVCC GVDD BSP PGND OUTP Gate Drive PVCC PVCC GVDD BSN PGND OUTN INP INN UVLO/OVLO SC Detect DC Detect Thermal Detect Startup Protection Logic Biases and References FAULT SD GAIN0 PLIMIT AGND AVCC GAIN1 Gain Control TTL Buffer Ramp Generator AVDD GVDD GVDD LDO Regulator Gain Control PLIMIT PLIMIT Reference OUTP FB OUTN FB OUTN FB OUTP FB TPA3112D1-Q1 www.ti.com SLOS793B – SEPTEMBER 2012 – REVISED SEPTEMBER 2015 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 DC Detect The TPA3112D1-Q1 has circuitry that protects the speakers from DC current which might occur due to defective capacitors on the input or shorts on the printed circuit board at the inputs. A DC detect fault is reported on the FAULT pin as a low state. The DC detect fault also causes the amplifier to shut down by changing the state of the outputs to Hi-Z. To clear the DC detect it is necessary to cycle the PVCC supply. Cycling SD does NOT clear a DC detect fault. A DC detect fault is issued when the output differential duty-cycle exceeds 14% (for example, 57%, –43%) for more than 420 ms at the same polarity. This feature protects the speaker from large DC currents or AC currents, less than 2 Hz. To avoid nuisance faults due to the DC detect circuit, hold the SD pin low at power-up until the signals at the inputs are stable. Also, take care to match the impedance seen at the positive and negative input to avoid nuisance DC detect faults. Copyright © 2012–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPA3112D1-Q1 |
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