TDA8939

TDA8939 Zero dead time Class-D 7.5 A power comparator Rev. 01 — 22 April 2004 Objective data sheet 1. General description Zero dead time Class-D 7.5 A power comparator The TDA8939 is a power comparator designed for use in a high efficiency class-D audio power amplifier system. It contains power switches, drive logic, protection circuitry, bias circuitry and a fully differential input stage (comparator). This device is optimized for applications in fully digital open-loop class-D audio systems (in combination with a digital PWM controller). The TDA8939 power comparator operates with high efficiency and low dissipation. The system operates over a wide supply voltage range from ±10 V up to ±30 V. 2. Features s s s s s s s s s Zero dead time switching Maximum output current 7.5 A Standby mode High efficiency Operating voltage from ±10 V to ±30 V (symmetrical) or 20 V to 60 V (asymmetrical) Low quiescent current High output power Diagnostic output Thermal protection, current protection and voltage protection. 3. Applications s s s s s Television sets Home-sound sets Multimedia systems All mains fed audio systems Car audio (boosters). Philips Semiconductors TDA8939 Zero dead time Class-D 7.5 A power comparator 4. Quick reference data Table 1: Quick reference data VP = ±25 V; fcarrier = 384 kHz. Symbol VP Parameter supply voltage Conditions symmetrical supply voltage asymmetrical supply voltage Iq(tot) total quiescent current no load connected; no filters; no snubbers connected effi...