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LM48510 bảng dữ liệu(PDF) 10 Page - Texas Instruments

tên linh kiện LM48510
Giải thích chi tiết về linh kiện  Boosted Class D Audio Power Amplifier
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Trang chủ  http://www.ti.com
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LM48510 bảng dữ liệu(HTML) 10 Page - Texas Instruments

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VDD (V)
0
200
400
600
800
1000
1200
VOUT = 5V
VOUT = 8V
VOUT = 10V
VOUT = 12V
0
10
20
30
40
50
60
70
80
0
0.25
0.50
0.75
1.00
1.25
1.50
100
90
OUTPUT POWER (W)
VDD = 2.7V
VDD = 3.3V
VDD = 5.0V
LM48510
SNAS275D – NOVEMBER 2006 – REVISED OCTOBER 2007
www.ti.com
Typical Performance Characteristics (continued)
Output Power
vs.
Efficiency
Boost Converter Max. Load Current
RL = 8Ω
vs. VDD
Application Information
GENERAL AMPLIFIER FUNCTION
The audio amplifier portion of LM48510 is a Class D featuring a filterless modulation scheme. The differential
outputs of the device switch at 300kHz from PV1 to GND. When there is no input signal applied, the two outputs
(VO1 and VO2) switch with a 50% duty cycle, with both outputs in phase. Because the outputs of the Class D
are differential, the two signals cancel each other. This results in no net voltage across the speaker, thus there is
no load current during an idle state, conserving power.
With an input signal applied, the duty cycle (pulse width) of the Class D outputs changes. For increasing output
voltages, the duty cycle of VO1 increases, while the duty cycle of VO2 decreases. For decreasing output
voltages, the converse occurs, the duty cycle of VO2 increases while the duty cycle of VO1 decreases. The
difference between the two pulse widths yields the differential output voltage.
OPERATING RATINGS
The LM48510 has independent power supplies for the Class D audio power amplifier (PV1, V1) and the Boost
Converter (VDD). The Class D amplifier operating rating is 2.4V≤(PV1, V1)≤5.5V when being used without the
Boost.
Note the output voltage (PV1, V1) has to be more than VDD.
DIFFERENTIAL AMPLIFIER EXPLANATION
As logic supply voltages continue to shrink, designers are increasingly turning to differential analog signal
handling to preserve signal to noise ratios with restricted voltage swing. The amplifier portion of the LM48510 is a
fully differential amplifier that features differential input and output stages. A differential amplifier amplifies the
difference between the two input signals. Traditional audio power amplifiers have typically offered only single-
ended inputs resulting in a 6dB reduction in signal to noise ratio relative to differential inputs. The amplifier also
offers the possibility of DC input coupling which eliminates the two external AC coupling, DC blocking capacitors.
The amplifier can be used, however, as a single ended input amplifier while still retaining it's fully differential
benefits. In fact, completely unrelated signals may be placed on the input pins. The amplifier portion of the
LM48510 simply amplifies the difference between the signals. A major benefit of a differential amplifier is the
improved common mode rejection ratio (CMRR) over single input amplifiers. The common-mode rejection
characteristic of the differential amplifier reduces sensitivity to ground offset related noise injection, especially
important in high noise applications.
10
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Copyright © 2006–2007, Texas Instruments Incorporated
Product Folder Links: LM48510


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