The gate resistors (or ferrite beads) have to be sized to avoid exceeding the peak and average current capabilities of the driver IC. Measuring the voltage drop across the gate resistor (or a small series resistor) may help. When too many MOSFET are used, keeping the driver within its ratings usually results in too slow switching.
I have seen some commercial designs that blow SG3525A from time to time because the IC is abused by driving too hard too many MOSFET. Sometimes this may be fixed by adding a separate driver like IR4427 (or better).
Anyway, IRFP064 is almost an obsolete device, take a look a IRF2907Z for example, gate charge is the same but Rds-on is half, body diode is much faster and output capacitance is lower too.
I have seen some commercial designs that blow SG3525A from time to time because the IC is abused by driving too hard too many MOSFET. Sometimes this may be fixed by adding a separate driver like IR4427 (or better).
Anyway, IRFP064 is almost an obsolete device, take a look a IRF2907Z for example, gate charge is the same but Rds-on is half, body diode is much faster and output capacitance is lower too.
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