The A3935 is designed specifically for automotive applications that require high-power motors. It provides six high-current gate drive outputs capable of driving a wide range of n-channel power MOSFETs. The A3935 integrates a pulse-frequency modulated boost converter to create a constant supply voltage for driving the external MOSFETs. Bootstrap capacitors are utilized to provide the above battery supply voltage required for n-channel FETs. Direct control of each gate output is possible via six TTL-compatible inputs. A differential amplifier is integrated to allow accurate measurement of the current in the three-phase bridge. Diagnostic outputs can be continuously monitored to protect the driver from short-to-battery, short-to-supply, bridge-open, and battery under/overvoltage conditions. Additional protection features include dead-time, VDD undervoltage, and thermal shutdown. The A3935 is supplied in a choice of three packages, a 44-lead PLCC with copper batwing tabs (suffix ED), a 48-lead low profile QFP with exposed thermal pad (suffix JP), and a 36-lead 0.8 mm pitch SOIC (suffix LQ).
The A3935 is a three-phase power MOSFET controller designed specifically for automotive applications requiring high-power motors. It integrates a pulse-frequency modulated (PEM) boost converter to create a constant supply voltage for driving external n-channel power MOSFETs from low-voltage battery supplies.
The device provides six high-current gate drive outputs and includes diagnostic features such as current monitor output, adjustable battery overvoltage detection, and protection against short-to-battery, short-to-supply, bridge-open, and thermal shutdown conditions.
| Operating Temperature Range (Tj) | -40°C to +150°C |
|---|---|
| Junction Temperature (Tj) | +150°C |
| Load Supply Voltages Range | -0.6 V to 40 V |
| Output Voltage Ranges (GHA/GHB/GHC) | -4V to 55 V |
| Logic Supply Voltage (VDD) Range | -0.3 V to +6.5 V |
| VBAT Operating Range | 7.0 V to 40 V |
| VREG Output Voltage | 12.7 V to 14 V |
| Boost Output Voltage Limit (Max) | 163 V |
Yes, it includes diagnostic outputs to protect against short-to-battery conditions.
The thermal shutdown activates at a junction temperature between 160°C and 180°C.