LM4651

·  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).
·  Short circuit current limiting and thermal shutdown protection.
·  15 Lead TO−220 isolated package.
·  Self checking protection diagnostic.

`  Powered subwoofers for home theater and PC's
`  Car booster amplifier
`  Self-powered speakers

If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales ffice/Distributors for availability and specifications.
Supply Voltage ........................................................± 22V
Output Current (LM4652) ...........................................10A
Power Dissipation (LM4651) (Note 3) ......................1.5W
Power Dissipation (LM4652) (Note 3) .......................32W
ESD Susceptibility (LM4651) (Note 4) ....................2000V
LM4652 (pins 2,6,10,11) .........................................500V
ESD Susceptibility (LM4651) (Note 5) .....................200V
LM4652 (pins 2,6,10,11) ........................................100V
Junction Temperature (Note 6) .............................150
Soldering Information
N, TA and TF Package (10 seconds) .....................260
Storage Temperature .........................−40 to + 150
Temperature Range ........................−40 T_A +85
Supply Voltage |V+| + |V−| .........................22V to 44V
Thermal Resistance
LM4651 N Package
_JA ....................................................................52/W
_JC ...................................................................22/W
LM4652 TF, TO−220 Package
_JA ..................................................................43/W
_JC ................................................................2.0/W
LM4652 T, TO−220 Package
_JA ................................................................37/W
_JC ..............................................................1.0/W

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. 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.