LM1875

ACTIVE

20-W Audio Power Amplifier

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Product details

Parameters

Audio input type Analog Input Architecture Class-AB Speaker channels (Max) Mono Power stage supply (Max) (V) 60 Power stage supply (Min) (V) 16 Load (Min) (ohms) 4 Output power (W) 20 THD + N @ 1 kHz (%) 0.015 Iq (Typ) (mA) 70 Control interface Hardware Closed/open loop Open Analog supply (Min) (V) 16 Analog supply (Max) (V) 60 PSRR (dB) 95 Operating temperature range (C) 0 to 70 open-in-new Find other Speaker amps

Package | Pins | Size

TO-220 (NDH) 5 86 mm² 10.16 x 8.47 open-in-new Find other Speaker amps

Features

  • 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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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 or 8 load on ±25V supplies. Using an 8 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.


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Technical documentation

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Type Title Date
* Datasheet LM1875 20W Audio Power Amplifier datasheet (Rev. A) May 13, 2004
Application note Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) Aug. 26, 2019
Application note AN-1849 An Audio Amplifier Power Supply Design (Rev. C) Jun. 27, 2019
More literature Die D/S LM1875 MWC 20-W Audio Power Amplifier Sep. 18, 2012

Design & development

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Hardware development

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(NEB) 5 View options
TO-220 (NDH) 5 View options

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