US 11,705,803 B1
Gate driver with improved switching performance and the driving method thereof
Di Han, San Jose, CA (US); and Jian Jiang, Saratoga, CA (US)
Assigned to Monolithic Power Systems, Inc., Kirkland, WA (US)
Filed by Monolithic Power Systems, Inc., Kirkland, WA (US)
Filed on Jun. 28, 2022, as Appl. No. 17/851,221.
Int. Cl. H02M 1/08 (2006.01); H03K 17/687 (2006.01)
CPC H02M 1/08 (2013.01) [H03K 17/6871 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A gate driver, configured to drive a power device, the power device having a normally-on device and a normally-off device coupled in series between a first terminal and a second terminal, the gate driver comprising:
a first driver, configured to receive a PWM signal, and to drive the normally-on device;
a second driver, configured to drive the normally-off device;
an under voltage detector, configured to detect an under voltage condition of a negative power supply of the first driver, a positive power supply of the second driver, and an input supply voltage; wherein when any one of the negative power supply, the input supply voltage, or the positive power supply is in an under voltage condition, the normally-off device is controlled to be OFF by the second driver; and
a converting circuit, configured to convert the input supply voltage to the positive power supply, and to the negative power supply.