The recommended power-on sequence is to apply the power supply voltage (VCC) before applying the audio signal. This ensures that the internal biasing circuitry is established before the audio signal is applied.
The gain of the LM4550 can be optimized by adjusting the values of the external resistors (R1 and R2) and capacitors (C1 and C2) in the feedback network. The gain can be calculated using the formula: Gain = (R2/R1) * (C1/C2).
The maximum power dissipation of the LM4550 is 1.4W. This is calculated based on the maximum junction temperature (TJ) of 150°C and the thermal resistance (RθJA) of 125°C/W.
Yes, the LM4550 can be used as a headphone amplifier. However, it's essential to ensure that the output power is limited to avoid damaging the headphones or the amplifier. A maximum output power of 100mW per channel is recommended.
To reduce noise and hum, ensure that the circuit is properly grounded, and the power supply is well-regulated. Additionally, use shielded cables, and keep the audio signal paths as short as possible. You can also add noise-reducing components, such as ferrite beads or common-mode chokes, to the circuit.
LM4550BVHX/NOPB datasheet
by Texas Instruments
