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TPA3112D1QPWPRQ1 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 TPA3112D1QPWPRQ1
상세설명  Filter-Free Mono Class-D Audio Power Amplifier
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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TPA3112D1QPWPRQ1 데이터시트(HTML) 11 Page - Texas Instruments

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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
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