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TPA2100P1YZHR Datasheet(PDF) 10 Page - Texas Instruments |
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TPA2100P1YZHR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 23 page RESISTOR – SPEAKER – RESISTOR LOAD CONFIGURATION Vdd SW IN- IN+ GND GND OUT + OUT - VccOUT VccIN C IN C IN SD SDa GAIN Digital BaseBand Analog Baseband or CODEC VIN 2 .5 Vto 5.5 V Vref BST 10nF 10 F m 10 F m 1 F m 4.7 H m 5~10 W 5~10 W 1 F m 0.1~2 F m R R AUDMAX SPK 1 = 2 R C f p ´ ´ ´ (1) OUTPEAK CLASSDPEAK 2 2 V I = R + XC (2) AUDMAX SPK 1 XC = 2 f C p ´ ´ ´ (3) RESISTOR – SPEAKER – INDUCTOR LOAD CONFIGURATION TPA2100P1 SLOS595 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com This is the simplest configuration. However, this type of load configuration does not achieve the best efficiency possible. Thus, it is recommended to use the resistor – speaker – inductor load configuration. The following figure shows an example of the resistor – speaker – resistor configuration. Figure 15. Application Schematic with Resistor – Speaker – Resistor Load Configuration For the RC load configuration, only two calculations are required. Note that R in Equation 1 is the sum of the two output resistors in Figure 15. The highest desired audio frequency will be limited by the RC low-pass filter configuration of the load: Peak Output Current from the Class-D Amplifier should therefore be limited to the maximum audio frequency: Where XC is: To calculate the proper boost converter inductor required for this application, see the Inductor Selection section. Note that an input low-pass filter should be added before the audio amplifier in order to limit the audio frequency, fAUDMAX. The second configuration with a resistor – speaker – inductor load is the most efficient configuration and is the preferred solution. Figure 16 shows an example of this configuration. 10 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPA2100P1 |
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