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PDF TCS7191B Data sheet ( Hoja de datos )
| Número de pieza | TCS7191B | |
| Descripción | 2.8W Non-Clip Class-D Audio Power Amplifier | |
| Fabricantes | TCS | |
| Logotipo |  |
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GENERAL DESCRIPTION
The TCS7191B is a 2.8W high efficiency, non-clip,
filterless, Class-D audio power amplifier. It
operates from 2.7V to 5.5V supply. When
powered with 5V supply voltage, the TCS7191B is
capable of delivering 2.8W into 4Ω load or 1.65W
into 8Ω load, with THD+D less than 10%.
The TCS7191B features a non-clip output control,
which detects the output clipping caused by the
over-level input signal and automatically adjusts
the dynamic range of the output signal to prevent
the distortion of the audio signal. The non-clip
output control also eliminates the output clipping
due to a low battery supply voltage.
As a Class-D power amplifier, the TCS7191B features
high efficiency, up to 90%, and high PSRR, 75dB
at 217Hz, which make the device ideal for use in
battery-powered portable devices. It also features
minimized click-and-pop noise during turn-on and
turn-off transitions.
APPLICATIONS
Cellular handsets
Portable navigation devices
Multimedia internet devices
APPLICATION CIRCUIT
TCS7191B
2.8W Non-Clip Class-D Audio Power Amplifier
FEATURES
Non-clip control to suppress output clipping
Filterless Class-D operation
High efficiency up to 90%
Output power at 5V supply
1.65W (8Ω load, 10% THD+N)
1.35W (8Ω load, 1% THD+N)
2.8W (4Ω load, 10% THD+N)
2.25W (4Ω load, 1% THD+N)
Low THD+N: 0.1% (typical) @ 1KHz
(VDD=3.6V, RL=4Ω, PO=0.65W)
Low quiescent current: 2.2mA @ VDD=3.6V (8Ω
load)
Low shutdown current: 0.1μA (typical)
High PSRR: 75dB (typical)
Two gain settings: 18/24 dB
One-wire control for the selection of operating
mode and gain
Over-circuit & thermal protection
Fast start-up time: 5ms
Available in COL1.55x1.55-9L, DFN2x2-8L,
MSOP-8L
Figure 1: Typical Application Circuit
Rev.1.0 Jan.20,2011 Page 1
1 page  
TCS7191B
2.8W Non-Clip Class-D Audio Power Amplifier
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency VS Output Power(3.6V)
100%
90%
80%
70%
60%
3.6V/8Ω+33uH,mode2
50%
40%
0
200 400 600 800
Output Power(mW)
Figure 2: Efficiency vs. Output Power
1000
Efficiency VS Output Power(3.6V)
100%
90%
80%
70%
60%
50% 3.6V/4Ω+30uH,mode2
40%
0
500
1000
1500
Output Power(mW)
Figure 3: Efficiency vs. Output Power
2000
Efficiency VS Output Power(5.0V)
100%
90%
80%
70%
60%
5.0V/8Ω+33uH,mode2
50%
40%
0
500
1000
1500
Output Power(mW)
2000
Figure 4: Efficiency vs. Output Power
Efficiency VS Output Power(5.0V)
100%
90%
80%
70%
60%
5.0V/4Ω+30uH,mode2
50%
40%
0
500 1000 1500 2000 2500 3000
Output Power(mW)
Figure 5: Efficiency vs. Output Power
THD+N VS Output Power
100
10
1
0.1
5.0V/8Ω+33uH,mode2
0.01
10
100 1000
Out Power(mW)
Figure 6: THD+N vs. Output Power
10000
THD+N VS Output Power
100
10
1
0.1
0.01
10
5.0V/4Ω+30uH,mode2
100 1000
Out Power(mW)
Figure 7: THD+N vs. Output Power
10000
Rev.1.0 Jan.20,2011 Page 5
5 Page 
TCS7191B
2.8W Non-Clip Class-D Audio Power Amplifier
Decoupling Capacitor (CS)
The TCS7191B is a high-performance Class-D audio amplifier that requires adequate power supply decoupling.
Adequate power supply decoupling to ensures that the efficiency is high and total harmonic distortion (THD) is
low.
Place a low equivalent-series-resistance (ESR) ceramic capacitor (X7R or X5R), typically 1µF, within 2mm of
the VDD (PVDD) pin. This choice of capacitor and placement helps with higher frequency transients, spikes,
or digital hash on the line. Additionally, placing this decoupling capacitor close to the TCS7191B is important, as
any parasitic resistance or inductance between the device and the capacitor causes efficiency loss. In addition
to the 1µF ceramic capacitor, place a 4.7µF to 22µF capacitor on the VDD (PVDD) supply trace. This larger
capacitor acts as a charge reservoir, providing energy faster than the board supply, thus helping to prevent
any droop in the supply voltage.
Input Capacitors (Cin)
Input audio DC decoupling capacitors are recommended. The input audio DC decoupling capacitors will
remove the DC bias from an incoming analog signal. The input capacitors (Cin) and internal input resistors
(Rin) form a high-pass filter with the corner frequency, fc, determined in Equation 1.
Any mismatch in capacitance between the two inputs will cause a mismatch in the corner frequencies. Severe
mismatch may also cause turn-on pop noise, PSRR, CMRR. Choose capacitors with a tolerance of ±5% or
better.
fc=1/(2 xπx Rin x Cin)
(1)
For best audio quality, use capacitors whose dielectrics have low-voltage coefficients, such as tantalum or
aluminum electrolytic. Capacitors with high-voltage coefficients, such as ceramics, could result in increased
distortion at low frequencies.
Rev.1.0 Jan.20,2011 Page 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet TCS7191B.PDF ] | |
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