UCD8220

Product Folder Order Now Technical Documents Tools & Software Support & Community UCD8220 SLUS652E – MARCH 2005 – REVISED APRIL 2020 UCD8220 Digitally Managed Push-Pull Analog PWM Controllers 1 Features 1 For digitally managed power supplies using μCs or the TMS320 ™ DSP family Voltage or peak current mode control with cycleby-cycle current limiting Clock input from digital controller to set operating frequency and max duty cycle Analog PWM comparator 2-MHz switching frequency 110-V input startup circuit and thermal shutdown (UCD8620) Internal programmable slope compensation 3.3-V, 10-mA linear regulator DSP/μC compatible inputs Dual ±4-A TrueDrive™ integrated circuit high current drivers 10-ns typical rise and fall times with 2.2-nF 25-ns input-to-output propagation delay 25-ns current sense-to-output propagation delay Programmable current-limit threshold Digital output current-limit flag 4.5-V to 15.5-V supply voltage range Rated from –40°C to 105°C 2 Applications Digitally managed switch mode power supplies Push-pull, half-bridge, or full-bridge converters Battery chargers Systems using the UCD8220 device close the PWM feedback loop with traditional analog methods, but the UCD8220 controller includes circuitry to interpret a time-domain digital pulse train. The pulse train contains the operating frequency and maximum duty cycle limit which are used to control the power supply operation. The device circuitry eases implementation...