Sunday, October 25, 2009
The LM1875 has a smaller package than the TO-220 package used for the LM3875. As a result, the feedback resistor can not be connected the same way I did for the LM3875. On the positive side: The package does not contain many unused pins.
Skema rangkaian 20 watt mono amplifier
The following components will be used:
- LM1875 Power OpAmp
- 4 capacitors BC 1000uF/50V
IC LM1875 description
The LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications.
The LM1875 delivers 20 watts into a 4 /8 ohm load on ±25V supplies. Using an 8 ohm load and ±30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload protection consists of both internal current limit and thermal shutdown.
The LM1875 design takes advantage of advanced circuit techniques and processing to achieve extremely low distortion levels even at high output power levels. Other outstanding features include high gain, fast slew rate and a wide power bandwidth, large output voltage swing, high current capability, and a very wide supply range. The amplifier is internally compensated and stable for gains of 10 or greater.
Features IC LM1875
• Up to 30 watts output power.
• AVO typically 90 dB.
• Low distortion: 0.015%, 1 kHz, 20 W.
• Wide power bandwidth: 70 kHz.
• Protection for AC and DC short circuits to ground.
• Thermal protection with parole circuit.
• High current capability: 4A.
• Wide supply range 16V-60V.
• Internal output protection diodes.
• 94 dB ripple rejection.
• Plastic power package TO-220.
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