Description
BUY LM1877-9 https://www.utsource.net/itm/p/12606365.html
| Parameter |
LM1877-9 Specifications |
| Supply Voltage (Vcc) |
12V to 40V |
| Quiescent Current |
6mA (typical) |
| Output Power |
2.5W into 8Ω (stereo) |
| Frequency Response |
20Hz to 20kHz (+0, -3dB) |
| Signal-to-Noise Ratio |
75dB (typical) |
| Total Harmonic Distortion (THD) |
0.5% (1kHz, 1W, 8Ω) |
| Input Sensitivity |
250mVrms (for 1W output into 8Ω) |
| Input Impedance |
47kΩ |
| Power Dissipation |
3.3W (per channel, derated above 25°C) |
| Operating Temperature Range |
0°C to +70°C |
| Package Type |
TO-220 |
Instructions for Use:
Power Supply:
- Connect the power supply pins to a regulated DC source between 12V and 40V.
Grounding:
- Ensure a common ground connection for both the power supply and audio input signals.
Input Connections:
- Connect the audio input signals to the respective input pins. The input impedance is 47kΩ, so match this with your source impedance for optimal performance.
Output Connections:
- Connect speakers or loads directly to the output pins. Ensure the load resistance is appropriate for the intended output power.
Heat Dissipation:
- If operating at high power levels, consider using a heatsink to manage thermal dissipation, especially in environments exceeding 25°C.
Capacitors:
- Place bypass capacitors close to the power supply pins to reduce noise and improve stability. A typical value is 0.1μF ceramic capacitor.
Protection:
- Incorporate protection circuits such as fuses or current limiting resistors to safeguard against short circuits or overcurrent conditions.
Layout Considerations:
- Keep signal paths short and direct to minimize noise pickup. Ground planes can help in reducing electromagnetic interference.
Testing:
- Before final assembly, test the amplifier with a known good signal to ensure proper operation and adjust any necessary settings.
These guidelines should help in effectively integrating the LM1877-9 into your design.
(For reference only)
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