Texas Instruments manual 2.TPA301 EVM, 3.TPA301 EVM Schematic Diagram, Details

The TPA301 Audio Power Amplifier Evaluation Module

3.2 The TPA301 Audio Power Amplifier Evaluation Module

The TPA301 audio power amplifier evaluation module is powered by a TPA301 350-mW low-power audio amplifier IC and includes onboard gain adjustment, a shutdown control signal input with onboard switch, and can be operated in either the BTL or single-ended output mode.

The module can be used with the TI plug-n-play audio amplifier evaluation platform (Figure 3 –1) or wired directly into circuits or equipment. The module has single in-line header connector pins mounted to the under side of the board. These pins allow the module to be plugged into the TI platform, which automatically makes all the signal input and output, power, and control connections to the module.

The module connection pins are on 0.1-inch centers to allow easy use with standard perf board and plug board-based prototyping systems, or to be wired directly into existing circuits and equipment when used stand-alone.

The module appears in Figure 3–2 and its schematic is shown in Figure 3 –3.

Figure 3–2. TPA301 EVM

	Shutdown		+5 V		GND
			C6			R5
S1				C3		C5
						DL
R1
						OUT–
C2
						GND
				U1
R2			C4
						OUT+
C1			R3			Lit.#
		–3				SLOP 115
	IN+
		R4
	GND					EVM
	TPA301

Figure 3–3. TPA301 EVM Schematic Diagram
						VDD	GND
					2.5 V to 5.5 V
						C6
						10 ∝	F
S1						+	R5	C5
		No							F
			1 Shutdown VO –		8		510 Ω	0.1 ∝
Shutdown									Dummy
R1			2		7				Load
				GND
			Bypass
20 kΩ		C2
			3		6				OUT–
	2.2 ∝ F			VDD
			In+			C3			GND
C1			4		5		∝ F
				VO +		2.2
1 ∝	F		In –
Audio Input+		R2							OUT+
						C4
Audio Input–		20 kΩ	R3	R4
						5 pF
			20 kΩ	200 kΩ

Details 3-3