Can two or more LM4652 ICs be put in parallel to drive lower impedance loads for higher power?
Yes. The PCB layout is a little more difficult but two different layouts have been tested on the bench. One layout has the two LM4652’s side by side with a space of 0.5 inches between for easy mounting to a common heat sink. The other layout has the two LM4652’s back to back with just enough space between to allow for a heat sink to be mounted. Both layouts were designed with minimal gate trace lengths as possible. Similar performance in Noise, THD, and power were observed for each board. Changes in the application circuit that were required for high power operation was the addition of 10µ F capacitors on the supply pins (Vcc and Vee) of the LM4651 and 47µ F capacitors on the supply pins (Vcc and Vee) of each LM4652. Larger capacitors are recommended for unregulated supplies. The dual LM4652 configuration can be used to drive two loads with the same input signal (i.e. dual voice coil woofer) with each LM4652 having it’s own output filter. The dual configuration can also be used to driv
