120V 4.5A half-bridge gate driver with 8V UVLO and negative voltage handling

The UCC27211A device driver is based on the popular UCC27201 MOSFET drivers; but, this device offers several significant performance improvements.

The peak output pullup and pulldown current has

been increased to 3.7A source and 4.5A sink and thereby allows for driving large

power MOSFETs with minimized switching losses during the transition through the

Miller Plateau of the MOSFET. The input structure can directly handle –10VDC, which

increases robustness and also allows direct interface to gate-drive transformers

without using rectification diodes. The inputs are also independent of supply

voltage and have a 20V maximum rating.

The switching node of the UCC27211A (HS pin) can handle –(24 - VDD) V

maximum, which allows the high-side channel to be protected from inherent negative

voltages caused by parasitic inductance and stray capacitance. The UCC27211A (TTL inputs) has increased hysteresis

that allows for interface to analog or digital PWM controllers with enhanced noise

immunity.

The low-side and high-side gate

drivers are independently controlled and matched to 4ns between the turn on and turn

off of each other. An on-chip 120V rated bootstrap diode eliminates the external

discrete diodes. Undervoltage lockout is provided for both the high-side and the

low-side drivers which provides symmetric turn on and turn off behavior and forces

the outputs low if the drive voltage is below the specified threshold.