LM4651 Datasheet | National Semiconductor

Description The IC bination of the LM4651 driver and the LM4652 power MOSFET provides a high efficiency, Class D subwoofer amplifier solution. The LM4651 is a fully integrated conventional pulse width modulator driver IC. The IC contains short circuit, under voltage, over modulation, and thermal shut down protection circuitry. 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, pact high power audio amplifier solution plete with protection normally seen only in Class AB amplifiers. Few external ponents 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 pared to Class AB amplifiers. This high efficiency solution significantly reduces the heat sink size pared 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) > 100d B (Min) Standby attenuation. Features Conventional pulse width modulation. Externally controllable switching frequency. 50k HZ to 200k Hz switching frequency range. Integrated error amp and feedback amp. Turn- on soft start and under voltage lockout. Over modulation protection (soft clipping). Short circuit current limiting and thermal shutdown protection. n 15 Lead TO- 220 isolated package. n Self checking protection diagnostic. n n n n n n n Applications n Powered subwoofers for home theater and PC’s n Car booster amplifier n Self-powered speakers Connection Diagrams LM4651 Plastic Package LM4652 Plastic Package (Note 8) DS101277-73 DS101277-72 Top View Order Number LM4651N See NS Package Number N28B Isolated TO-220 Package Order...