SLUS652E March 2005 – April 2020 UCD8220
PRODUCTION DATA.
请参考 PDF 数据表获取器件具体的封装图。
The UCD8220 device is a digitally managed analog PWM controller that is configured with push-pull drive logic.
In systems using the UCD8220 device, the PWM feedback loop is closed using the traditional analog methods. However, the UCD8220 includes circuitry to interpret a time-domain digital pulse train from a digital controller. The pulse train contains the operating frequency and maximum duty-cycle limit and therefore controls the power supply operation. The device circuitry eases the implementation of a converter with high-level control features without the added complexity or digital PWM-resolution limitations encountered when closing the voltage control-loop in the discrete time domain.
The UCD8220 device can be configured for either peak current-mode or voltage-mode control. The device provides a programmable current-limit function and a digital output current limit flag which can be monitored by the host controller. For fast switching speeds, the output stages use the TrueDrive output-circuit architecture, which delivers rated current of ±4-A into the gate of a MOSFET during the Miller plateau region of the switching transition. Finally the device also includes a 3.3-V, 10-mA linear regulator to provide power for the digital controller.
The UCD8220 device includes circuitry and features to ease implementing a converter that is managed by a microcontroller or a digital signal processor. Digitally managed power supplies provide software programmability and monitoring capability of the operation of the power supply, including: