ZHCSTB0E February 2010 – November 2023 UCC27321-Q1 , UCC27322-Q1
PRODUCTION DATA
Although quiescent VDD current is very low, total supply current is higher, depending on the OUT current and the programmed oscillator frequency. Total VDD current is the sum of quiescent VDD current and the average OUT current. Knowing the operating frequency and the MOSFET gate charge (Qg), average OUT current can be calculated from Equation 1:
where
For the best high-speed circuit performance, TI recommends two VDD bypass capacitors to prevent noise problems. TI highly recommends the use of surface-mount components. A 0.1-µF ceramic capacitor must be placed closest to the VDD-to-ground connection. In addition, a larger capacitor (such as 1-µF) with relatively low ESR must be connected in parallel, to help deliver the high-current peaks to the load. The parallel combination of capacitors must present a low-impedance characteristic for the expected current levels in the driver application.