NSA2093

NSA2093 is a high-voltage, high-performance Class-D audio power amplifier driver IC designed for ultra-high output power Class-D audio amplifier systems. It integrates an analog power amplifier, PWM modulation circuit, high-side and low-side overcurrent protection (for both high-side and low-side power devices), shoot-through prevention dead-time logic, and three voltage domains (VAA~VSS / VCC~COM / VB~VS). The device adopts a flexible, open-loop topology to implement PWM modulation. NSA2093 integrates a pop-and-click suppression function during startup and shutdown to eliminate unwanted audible noise when the PWM signal is enabled or disabled. Combined with a power bridge circuit and a few passive components, a complete Class-D audio power amplifier can be realized. NSA2093 is a high-power Class-D audio amplifier driver IC integrating a PWM modulator and overcurrent protection. Paired with external power MOSFETs and a small number of passive components, it forms a complete Class-D audio power amplifier with high-side and low-side overcurrent protection, shoot-through protection, and undervoltage lockout. The error amplifier analog input section is highly versatile, and the PWM modulation circuit is flexible and adjustable, supporting multiple PWM modulation schemes. The device detects overcurrent conditions in power MOSFETs by sensing RDS(on), eliminating the need for direct current sensing used in traditional overcurrent protection schemes, thereby simplifying the system architecture and reducing application complexity. To match the bridge output topology, the analog PWM modulator and protection logic are placed in a floating well, and the high-side circuitry is also placed in a floating well. The breakdown voltage between the floating well and the chip substrate ground (COM) exceeds 200V, enabling operation in amplifier applications up to ±100V and achieving power output exceeding 500W. NSA2093 also integrates a pop-click noise suppression circuit to eliminate noise caused during the startup and shutdown phases of the PWM modulated waveform.

Applications

• Home theater systems
• Stereo mini component systems
• Active speaker systems
• General-purpose audio power amplifiers

Key features

• Class-D power amplifier with integrated analog signal input
• Power amplifier open-loop gain >60dB
• Integrated overcurrent protection with auto-recovery for both high-side and low-side
• External 5V reference voltage output; programmable low-side overcurrent protection threshold
• Programmable timer for protection signal duration
• Programmable preset dead time for improved THD performance
• 25ns @ DT pin voltage >0.57V
• 40ns @ 0.57V > DT pin voltage >0.36V
• 65ns @ 0.36V > DT pin voltage >0.23V
• 105ns @ 0.23V > DT pin voltage >0V
• Integrated "click-and-pop" suppression during turn-on and turn-off
• Integrated multi-voltage-domain UVLO and overvoltage clamp protection
• High transient noise immunity (CMTI): >50V/ns
• Output swing up to ±100V, enabling output power exceeding 500W
• Maximum operating frequency: 800KHz
• Wide temperature range: -40℃~125℃
• Switching parameters:
• 360ns/335ns typical propagation delay
• 500ns maximum overcurrent protection delay
• 250ns maximum enable control delay
• Output source/sink current capability up to 2A
• RoHS compliant
• MLPQ48