Diodes has introduced a pair of dual-channel high and low-side mosfet drivers for applications up to 50V. Called DGD0506 and DGD0507, they will both driver a pair of n-channel mosfets in a half-bridge configuration.
“A 50V rating suits a wide range of motor driving requirements, especially brushless DC motors, which are increasingly being used in battery-powered applications such as drones, fans, e-cigarettes, and cordless power tools including drills, handheld vacuum cleaners and blenders,” said the firm.
Logic level inputs (from 2.5V) allow the chips to be controlled from 3.3V microcontrollers, Vcc is 8 to 14V , and a bootstrap circuit provides a voltage on top of the Vcc rail to enhance the top mosfet – the bootstrap diode included in the IC.
Supplied in a 3mm x 3mm DFN3030 package (a pin-for-pin alternative to industry types), the two parts differ in that:
- DGD0506 takes in a single PWM waveform and includes an deadtime circuit (programmed from 70ns to 420ns by an external resistor) which internally produces two non-overlapping drive waveforms for the two mosfets.
- DGD0507 requires two PWM inputs, one for each mosfet, and leaves waveform generation including dead-time control to an external microcontroller. In this way, higher switching speed can be achieved – propagation delay is 35ns max, matched to within 5ns. Cross-conduction prevention logic is included to protect the mosfets from gross waveform errors that attempt to turn both on at the same time.
Under-voltage lock-out circuitry protects the mosfets against a loss of supply.
Stand-by current is <1μA.