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)
• Internal Programmable Slope Compensation
• 3.3-V, 10-mA Linear Regulator
• DSP/µC Compatible Inputs
• Dual ±4-A TrueDrive 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
• APPLICATIONS
  • Digitally Managed Switch Mode Power Supplies
  • Push-Pull, Half-Bridge, or Full-Bridge Converters
  • Battery Chargers

PowerPAD Is a trademark of Texas InstrumentS