The UCD8220 analog pulse-width modulator device is used in digitally managed power supplies using a microcontroller or the TMS320 DSP family.
UCD8220 ia a double-ended PWM controller configured with push-pull drive logic.
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. This eases implementation of a converter with high level control features without the added complexity or possible PWM resolution limitations of closing the control loop in the discrete time domain.
For Digitally Managed Power Supplies Using µCs or the TMS320™: DSP Family
Voltage or Peak Current Mode Control with Cycle-by-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)
