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TPA3111D1 数据表(PDF) 11 Page - Texas Instruments

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部件名 TPA3111D1
功能描述  10-W Filter-Free Mono Class-D Audio Power Amplifier With Speaker Guard
Download  31 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

TPA3111D1 数据表(HTML) 11 Page - Texas Instruments

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PLIMIT
PLIMIT
Reference
Gain Control
TTL
Buffer
LDO
Regulator
Ramp
Generator
Biases and
References
Startup
Protection
Logic
SC Detect
DC Detect
Thermal
Detect
UVLO and
OVLO
Gate
Drive
Gate
Drive
PWM
Logic
AGND
GVDD
GVDD
AVCC
AVCC
PLIMIT
GAIN1
GAIN0
SD
FAULT
INN
INP
OUTN FB
Gain
Control
OUTP FB
GVDD
PVCC
PVCC
PVCC
PVCC
GVDD
OUTN FB
OUTP FB
OUTN
PGND
BSN
PGND
OUTP
BSP
Copyright © 2016, Texas Instruments Incorporated
11
TPA3111D1
www.ti.com
SLOS618F – AUGUST 2009 – REVISED JULY 2016
Product Folder Links: TPA3111D1
Submit Documentation Feedback
Copyright © 2009–2016, Texas Instruments Incorporated
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Gain Setting Through GAIN0 and GAIN1 Inputs
The gain of the TPA3111D1 is set by two input pins, GAIN0 and GAIN1. The voltage slew rate of these gain
pins, along with SD and AVCC (pin 14), must be restricted to no more than 10 V/ms. For higher slew rates, use a
100-kΩ resistor in series with the pins.
The gains listed in Table 1 are realized by changing the taps on the input resistors inside the amplifier. This
causes the input impedance (ZI) to be dependent on the gain setting. The actual gain settings are controlled by
ratios of resistors, so the gain variation from part-to-part is small. However, the input impedance from part to part
at the same gain may shift by ±20% due to shifts in the actual resistance of the input resistors.
For design purposes, the input network must be designed assuming an input impedance of 7.2 k
Ω, which is the
absolute minimum input impedance of the TPA3111D1. At the lower gain settings, the input impedance could
increase as high as 72 k
Table 1. Gain Setting
GAIN1
GAIN0
AMPLIFIER GAIN (dB)
INPUT IMPEDANCE
(k
Ω)
TYPICAL
TYPICAL
0
0
20
60
0
1
26
30
1
0
32
15
1
1
36
9


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