Details

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BUY LM1875T https://www.utsource.net/itm/p/12597596.html

Parameter	Symbol	Conditions	Min	Typical	Max	Unit
Supply Voltage	Vcc	Continuous Operation	24	-	60	V
Output Power	Pout	8惟 Load, THD = 0.1%	-	30	-	W
Quiescent Current	Iq	No Signal	-	20	-	mA
Input Sensitivity	Vin	For 1W Output into 8惟	-	200	-	mV
Input Impedance	Zin	1kHz	-	47	-	k惟
Bandwidth	BW	-3dB Points	-	20	-	kHz
Signal-to-Noise Ratio	SNR	A-Weighted	-	90	-	dB
Total Harmonic Distortion	THD	1kHz, 1W into 8惟	-	0.05	-	%
Power Dissipation	Pd	Tc = 25掳C	-	40	-	W
Operating Temperature Range	Toper	-	-40	-	125	掳C
Storage Temperature Range	Tstg	-	-65	-	150	掳C

Instructions for Use:

1. Power Supply:

   • The LM1875T can operate with a supply voltage ranging from 24V to 60V. Ensure that the power supply is stable and capable of providing the required current.

2. Output Power:

   • The typical output power is 30W into an 8惟 load with a total harmonic distortion (THD) of 0.1%. Adjust the load impedance and input signal to achieve the desired power output.

3. Quiescent Current:

   • The quiescent current is typically 20mA with no signal applied. This helps in minimizing power consumption during idle periods.

4. Input Sensitivity:

   • The input sensitivity is 200mV for 1W output into an 8惟 load. Adjust the input signal level to match this sensitivity for optimal performance.

5. Input Impedance:

   • The input impedance is 47k惟 at 1kHz. Ensure that the source impedance is much lower than this value to avoid significant signal attenuation.

6. Bandwidth:

   • The bandwidth is 20kHz at the -3dB points. This ensures that the amplifier can handle a wide range of audio frequencies.

7. Signal-to-Noise Ratio:

   • The signal-to-noise ratio is 90dB (A-weighted). This indicates a high level of noise rejection, ensuring clear audio output.

8. Total Harmonic Distortion:

   • The THD is 0.05% at 1kHz and 1W into an 8惟 load. This low distortion ensures high fidelity audio reproduction.

9. Power Dissipation:

   • The maximum power dissipation is 40W at 25掳C. Ensure adequate heat sinking to manage thermal conditions, especially when operating at high power levels.

10. Operating Temperature Range:

    • The operating temperature range is from -40掳C to 125掳C. Ensure that the ambient temperature is within this range to prevent damage to the device.

11. Storage Temperature Range:

    • The storage temperature range is from -65掳C to 150掳C. Store the device in a dry and temperature-controlled environment to ensure long-term reliability.

Additional Notes:

• Heat Sinking: Proper heat sinking is crucial for reliable operation, especially at high power levels. Refer to the datasheet for recommended heat sink designs.
• Protection Circuits: The LM1875T includes internal protection circuits for short-circuit, thermal overload, and DC offset protection. However, external protection components may be necessary for robust design.
• Layout Considerations: Follow good PCB layout practices to minimize noise and interference. Keep power and ground planes wide and short, and use bypass capacitors close to the power pins.

(For reference only)