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LM4651N

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仕様・特性

OBSOLETE LM4651, LM4652 www.ti.com SNOS507G – MAY 2004 – REVISED JULY 2009 LM4651 & LM4652 Overture™ Audio Power Amplifier 170W Class D Audio Power Amplifier Solution Check for Samples: LM4651, LM4652 FEATURES 1 • • • • • • • 23 Conventional pulse width modulation. Externally controllable switching frequency. 50kHz to 200kHz switching frequency range. Integrated error amp and feedback amp. Turn−on soft start and under voltage lockout. Over modulation protection (soft clipping). Externally controllable output current limiting • and thermal shutdown protection. Self checking protection diagnostic. APPLICATIONS • • • Powered subwoofers for home theater and PC's Car booster amplifier Self-powered speakers DESCRIPTION The IC combination 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. The LM4651also contains a standby function which shuts down the pulse width modulation minimizing supply current. The LM4652 is a fully integrated H-bridge power MOSFET IC in a TO-220 power package. The LM4652 has a temperature sensor built in to alert the LM4651 when the die temperature of the LM4652 exceeds the threshold. 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. Table 1. Key Specifications VALUE UNIT Output power into 4Ω with < 10% THD. 170 W (Typ) THD at 10W, 4Ω, 10 − 500Hz. < 0.3% THD (Typ) Maximum efficiency at 125W 85% (Typ) Standby attenuation. >100 dB (Min) 1 2 3 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Overture is a trademark of dcl_owner. All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2004–2009, Texas Instruments Incorporated

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