NS4251 Description:
    The NS4251 is a 3W dual-channel audio amplifier with Class AB/Class D working mode switching function, analog 3D surround sound function.
    In addition, when the headphone plug is plugged into the jack, the audio power amplifier drives the stereo headphone in single-ended operating mode.
    A control pin enables the chip to switch between Class AB or Class D operating modes to match different application environments. Even operating in Class D mode, the NS4251 employs advanced technology that greatly reduces EMI interference over the full bandwidth range, minimizing the impact on other components.
    To simplify the design of the audio system, the NS4251's bridge-connected speaker amplification mode and single-ended stereo headset amplification mode are implemented on the same chip.
    The NS4251's filter-free PWM modulation structure and built-in feedback resistance reduce external components, PCB area, and system costs.
    NS4251 built-in overcurrent protection, overheat protection and undervoltage protection functions, effectively protect the chip from being damaged under abnormal working conditions. And the use of spread spectrum technology to fully optimize the new circuit design, up to 90% efficiency is more suitable for mobile phones and other portable audio products.
    The NS4251 is available in a QFN3×3-16 package with a rated operating temperature range of -40 ° C to 85 ° C.

Class AB/Class D working mode switching function
Simulate 3D surround sound function
3W output power
0.1%THD (1W output power, 5V power supply)
Excellent full bandwidth EMI rejection
Excellent "power on, power off" noise suppression
Up to 90% + efficiency (Type D operating mode)
High PSRR: -80dB (217Hz)
Operating voltage range: 3.0V ~ 5.5V
Overcurrent protection, overheat protection, undervoltage protection
Stereo headset amplification mode
The NS4251 is available in a QFN3×3-16 lead-free package

laptop
Desktop computer
Low voltage sound system