3940 Datasheet (Allegro Micro Systems) - Full-Bridge Power MOSFET Controller

3940, Full-Bridge Power MOSFET Controller

GLB/GLA.

Low-side gate drive outputs for external MOSFET drivers.

External series gate resistors can be used to control slew rate seen at the power MOSFET’s gate.

IDEAD.

Analog input current set by resistor to ground controls basic Deadtime.

Open pin gives unspecified long Deadtime.

Always use Rde

3940 3940 ADVANCED DATASHEET 4/9/03 (Subject to change without notice.) H-BRIDGE POWER MOSFET CONTROLLER The A3940 was designed specifically for driving high power DC motors in automotive applications.

The A3940 provides four high current gate drive outputs capable of driving a wide range of power N-channel MOSFETs.

Bootstrap capacitors are utilized to provide the above battery supply voltage required for N-channel FETs.

An internal charge pump for the highside will allow for DC (100%

3940 Features

* include supply under-voltage and over-voltage, programmable deadtime adjustment for cross-conduction protection, thermal shutdown, and motor lead short-to-supply and short-to-ground protection. The A3940 is available in 28L low profile (1mm) e-TSSOP packaging (LP) which has an exposed pad solderable