NXP公司的TFA9815是用于高效D類音頻功率放大器系統的兩路功率比較器,包括有兩個全橋BTL功率級,驅動邏輯,保護控制邏輯和全差分輸入比較器. TFA9815的工作電壓為8 V 到20 V,不需要外接散熱器.具有熱保護和零死區開關和限流特性,可廣泛應用于自振或開環D類音頻功率放大,平板電視機和監視器,多媒體系統,無線揚聲器以北及高端CRT電視機.本文介紹了TFA9815主要特性,方框圖以及典型應用電路圖和材料清單.
TFA9815: Stereo full-bridge audio amplifier 2 x 17 W
The TFA9815 is a 2-channel power comparator for high-efficiency class D audio amplifier
systems. It contains two full-bridge Bridge-Tied Load (BTL) power stages, drive logic,
protection control logic and full differential input comparators. By using this power
comparator a compact closed-loop self-oscillating digital audio amplifier system or
open-loop system can be built. The continuous output power is 2 x17 W in a full-bridge
BTL application. The TFA9815 does not require a heat sink and operates using an
asymmetrical supply voltage.
主要特性:
Stereo full-bridge audio amplifier for class D applications
No external heat sink required
Operating voltage range: asymmetrical from 8 V to 20 V
Thermally protected
Zero dead-time switching
Current-limiting (no audible interruptions)
應用:
Self-oscillating or open-loop class D audio amplifier applications
Flat-panel television sets
Flat-panel monitors
Multimedia systems
Wireless speakers
High-end CRT television sets
圖1.TFA9815方框圖
圖2.TFA9815差分輸入配置
圖3.TFA9815單端輸入配置
圖4.TFA9815典型應用電路圖
典型應用材料清單(BOM):
緩沖網絡材料清單:
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