JAJSHP7D May 2015 – July 2019 DRV8305-Q1
PRODUCTION DATA.
The DRV8305-Q1 is a 4.4-V to 45-V automotive gate driver IC for three-phase motor driver applications. This device reduces external component count in the system by integrating three half-bridge drivers, charge pump, three current shunt amplifiers, an uncommited 3.3-V or 5-V, 50-mA LDO, and a variety of protection circuits. The DRV8305-Q1 provides overcurrent, shoot-through, overtemperature, overvoltage, and undervoltage protection. Fault conditions are indicated by the nFAULT pin and specific fault information can be read back from the SPI registers. The protection circuits are highly configurable to allow adaptation to different applications and support limp home operation.
The gate driver uses a tripler charge pump to generate the appropriate gate-to-source voltage bias for the external, high-side N-channel power MOSFETs during low supply conditions. A regulated 10-V LDO derived from the charge pump supplies the gate-to-source voltage bias for the low-side N-channel MOSFET. The high-side and low-side peak gate drive currents are adjustable through the SPI registers to finely tune the switching of the external MOSFETs without the need for external components. An internal handshaking scheme is used to prevent shoot-through and minimize the dead time when transitioning between MOSFETs in each half-bridge. Multiple input methods are provided to accommodate different control schemes including a 1-PWM mode which integrates a six-step block commutation table for BLDC motor control.
VDS sensing of the external power MOSFETs allows for the DRV8305-Q1 to detect overcurrent conditions and respond appropriately. Integrated blanking and deglitch timers are provided to prevent false trips related to switching or transient noise. Individual MOSFET overcurrent conditions are reported through the SPI status registers and nFAULT pin. A dedicated VDRAIN pin is provided to accurately sense the drain voltage of the high-side MOSFET.
The three internal current shunt amplifiers allow for the implementation of common motor control schemes that require sensing of the half-bridge currents through a low-side current shunt resistor. The amplifier gain, reference voltage, and blanking are adjustable through the SPI registers. A calibration method is providing to minimize inaccuracy related to offset voltage.
Three versions of the DRV8305-Q1 are available with separate part numbers for the different devices options: