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  • LM4991: LM4991 single ended output AGC circuit for high impedance headphone

    Part Number: LM4991 I am designing AGC circuit for an audio device so that its output can drive headphone. LM4991 is output stage of this audio device. It is circuit is as: The headphone load is featured as 150 ohm @1KHz. Its input spec is from 0…
    • Answered

  • LM4991: Parallel Speaker Connection

    Resolved
    Part Number: LM4991 Hi Ti, Is there a problem with connecting two 8-ohm speakers in parallel to the output of the LM4991? The speakers are rated at 1 W. Best regards,
    • Resolved
    • Answered

  • LM4991: Usage

    Resolved
    Part Number: LM4991 Tool/software: Hi Ti, Is there any problem with the following usage of LM4991? Supply voltage: 5V Maximum input signal amplitude: 5Vpp Maximum output signal amplitude: 6Vpp (Av=1.2) Best regards,
    • Resolved
    • Answered

  • LM4991: Feedback resistance

    Resolved
    Part Number: LM4991 Tool/software: Hi Ti, I am planning to use a digital potentiometer for the feedback resistor (RF) of the LM4991. I am thinking of using this to control the gain, but is this a problem? Best regards,
    • Resolved

  • LM4991: 3.0-W, mono, analog input Class-AB audio amplifier

    Part Number: LM4991 Other Parts Discussed in Thread: LM48511 Tool/software: We are using the LM4991LD/NOPB 3W power amplifier. We need a 5W amplifier. Please suggest which amplifier should be used
    • Answered

  • LM4991: Work well at Ri=3.9kohms, Rf=6.2kohms, RL(Speaker)=32ohms and VDD=5V?

    Resolved
    Part Number: LM4991 Other Parts Discussed in Thread: LM4818 Tool/software: Hello, My customer is considering to use one of LM4991MA/NOPB, LM4818MX/NOPB, LM4864M/NOPB, LM4862M/NOPB or LM4861M/NOPB. At the application circuits on the datasheet, they would…
    • Resolved

  • LM4991: looking for spice model

    TI Thinks Resolved
    Part Number: LM4991 Other Parts Discussed in Thread: TPA6211A1 Hi, I am looking for a spice model of LM4991, but I can't find anything! Anyone knows where to find it? Thanks, Roberto
    • Answered

  • LM4991: Characteristics above 20kHz

    Resolved
    Part Number: LM4991 Hi, My customer would like to use LM4991 at 25kHz. However the characteristics(frequency vs Gain, THD+N) shown on the datasheet is below 20kHz as following. (We're understanding that it is valid because LM4991 is audio amp…
    • Resolved

  • LM4991: Timing issue with shutdown

    Part Number: LM4991 Hi, we have an issue with the LM4991. In our design the startup time is very important. We want to switch off the amp via the shutdown-pin between audio signals. 90 ms after we pull the shutdown to GND (to activate audio) the audio…
    • Answered

  • RE: LM4991 THD+N & Stability Time

    Resolved
    Hi, Nanokawa-san, Thank you for your cooperation. We have obtained a reply from our customers. Our customers understood that LM4991 will be easy to get into thermal shutdown mode by using RL=4ohm, said that when they adopt a new set, they would like…

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