SLOS704B January 2011 – August 2015 TPA6138A2
PRODUCTION DATA.
The gain-setting resistors, RIN and Rfb, must be placed close to pins 13 and 17, respectively, to minimize capacitive loading on these input pins and to ensure maximum stability of the TPA6138A2. For the recommended PCB layout, see the TPA6138A2EVM User's Guide (SLOU305).
A low equivalent-series-resistance (ESR) ceramic capacitor, typically 1 μF, placed as close as possible to the device VDD lead works best. Placing this decoupling capacitor close to the TPA6138A2 is important for the performance of the amplifier. For filtering lower-frequency noise signals, a 10-μF or greater capacitor placed near the audio power amplifier would also help, but it is not required in most applications because of the high PSRR of this device