GENERAL DESCRIPTION
The IC combination of the LM4651 driver and It contains a standby function, which shuts down the pulse width modulation and minimizes supply current. The LM4652 is a fully integrated H-bridge power MOSFET IC in a TO-220 power package. Together, these two IC’s form a simple, compact high power audio amplifier solution complete with protection normally seen only in Class AB amplifiers. Few external components and minimal traces between the IC’s keep the PCB area small and aids in EMI control. The near rail-to-rail switching amplifier substantially increases the efficiency compared to Class AB amplifiers. This high efficiency solution significantly reduces the heat sink size compared to a Class AB IC of the same power level. This two-chip solution is optimum for powered subwoofers and self powered speakers. Key Specifications n n n n Output power into 4Ω with < 10% THD. 170W (Typ) < 0.3% THD (Typ) THD at 10W, 4Ω, 10 − 500Hz. Maximum efficiency at 125W 85% (Typ) > 100dB (Min) Standby attenuation.
National Semiconductor
