The NS4131 is a Class AB bridge output audio power amplifier. Its application circuit is simple and only a few peripheral devices are needed. The output does not require external coupling capacitors or up-lift capacitors and buffering networks, making it more suitable for portable systems.
    The NS4131 can reduce power consumption by entering a low-power shutdown mode via an SD control pin. The voltage gain of the amplifier can be adjusted by configuring the peripheral resistance for easy application.
    The NS4131 is available in the DFN-2x2-8L package and is rated for operating temperatures ranging from -40 ° C to 85 ° C.

Voltage range 3.0V to 5.0V
Output power: 2. 4W@R L =4Ω/THD+N=10%
Shutdown mode leakage current: 1uA (typical)
SD pin high level off mode
Unit gain stabilization
External feedback resistors and input resistors with adjustable gain
Available in DFN-2x2-8L package

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    The NS4131 is an audio power amplifier with differential output, which integrates two operational amplifiers, the gain of the first amplifier can be set by feedback resistance, and the latter one is followed by voltage reversal, thus forming an amplifier driver circuit with differential output whose gain can be configured.

    In the application of amplifier, the bypass design of the power supply is very important, especially for the noise performance and the voltage suppression performance of the power supply. In the design, the bypass capacitor is required to be as close to the chip and power pin as possible. The typical capacitance is a 10uF electrolytic capacitor and a 0.1uF ceramic capacitor.
    In the NS4131 application circuit, another capacitor, C BY (connected to BYP pin), is also very critical, affecting PSRR, on/off/switch noise performance. Generally choose 0.1uF ~ 1uF ceramic capacitor.

    The NS4131 is provided with an SD control pin, which allows the customer to control the amplifier's operation through the level of the SD pin. The audio power amplifier is in active mode when the SD pin is at low power level. When the SD pin is at high power level, the chip enters the off mode, and the off current of the chip is 1uA to achieve power saving.

DFN-2x2-8L package: