The ceramic capacitor is not required if the bootstrap capacitor is tantalum. Since we’re using an electrolytic capacitor, a ceramic capacitor should be used in parallel with this capacitor. For high frequencies like 30kHz to 50kHz, I use between 4.7 ♟ and 22 ♟. For low frequencies such as 50Hz, I use between 47 ♟ and 68 ♟ capacitance. So, I just estimate the required capacitance. However, there are many parameters involved, some of which we may not know – for example, the capacitor leakage current. Yes, there are formulae available for calculating the capacitance. The higher the duty cycle, the higher the required capacitance for C1. Thus, the lower the frequency, the higher the required capacitance for C1. The higher the on time, the higher the required capacitance. C1 must also not be too large that charging is too slow and the voltage level does not rise sufficiently to keep the MOSFET on. A large enough capacitance must be chosen for C1 so that it can supply the charge required to keep Q1 on for all the time.
When LIN = 0 and HIN = 1, this charge on the C1 and C2 is used to add the extra voltage – VB in this case – above the source level of Q1 to drive the Q1 in high-side configuration. When LIN = 1 and Q2 is on, C1 and C2 get charged to the level on VB, which is one diode drop below +VCC. Circuit Board Dc Audio Tesla Tl494 Ir2110 High Power Pwm Cycle Schematic.
D1, C1 and C2 along with the IR2110 form the bootstrap circuitry. MOSFET Drivers MOSFET Led Led LED Driver Circuits Oscillators Oscillators. We checked the latest version of Mosfet gate driver circuit diagram using 50 antivirus software and found it virus free.