Silabs公司的Si824x系列是兩路隔離的驅動(dòng)器,輸入和輸出以及輸出間絕緣,峰值電流為0.5 A (Si8241)和4.0 A (Si8244) ,最大音頻功率30W,工作最高電壓為24V, Si824x還集成了死區發(fā)生器,以獲得最佳的THD,主要用在D類(lèi)音頻放大器.本文介紹了Si824x主要特性,方框圖, D類(lèi)音頻放大器方框圖,半橋音頻應用框圖以及Si824x D類(lèi)音頻放大器參考設計電路圖和材料清單(BOM).
The Si824x isolated driver family combines two isolated drivers in a single package. The Si8241/44 are high-side/low-side drivers specifically targeted at high-power (>30 W) audio applications. Versions with peak output currents of 0.5 A (Si8241) and 4.0 A (Si8244) are available. All drivers operate with a maximum supply voltage of 24 V.
Based on Silicon Labs’proprietary isolation technology, the Si824x audio drivers incorporate input-to-output and output-to-output isolation, which enables leveltranslation
of signals without additional external circuits as well as use of bipolar supply voltage up to ±750 V. The Si824x audio drivers feature an integrated deadtime generator that provides highly precise control for achieving optimal THD.
These products also have overlap protection that safeguards against shootthrough current damage. The CMOS based design also provides robust immunity from latch-up and high-voltage transients. The extremely low propagation delays enable faster modulation frequencies for an enhanced audio experience. The TTL level compatible inputs with >400 mV hysteresis are available in PWM input configuration; other options include UVLO levels of 8 V or 10 V. These products are available in narrow body SOIC packages。
Si824x主要特性：
0.5 A peak output (Si8241)
4.0 A peak output (Si8244)
PWM input
High-precision linear programmable dead-time generator 0.4 ns to 1 μs
High latchup immunity >100 V/ns
Up to 1500 Vrms output-output isolation, supply voltage of ±750 V
Input to output isolation for low noise (up to 2500 V)
Up to 8 MHz operation
Wide operating range
–40 to +125℃
Transient immunity >30 kV/μs
RoHS-compliant
SOIC-16 narrow body
Si824x應用：

Class D audio amplifiers