The UCD8220-Q1 analog pulse-width modulator (PWM) device is used in digitally managed
power supplies using a microcontroller or the TMS320 DSP family.
The UCD8220-Q1 device is a double-ended PWM controller configured with push-pull drive
Systems using the UCD8220-Q1 device close the PWM feedback loop with traditional analog
methods, but the UCD8220-Q1 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 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.
The UCD8220-Q1 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 to set the current limit
operation. For fast switching speeds, the output stage uses the TrueDrive output circuit
architecture, which delivers rated current of ±4-A into the gate of a MOSFET. Finally the device
also includes a 3.3-V, 10-mA linear regulator to provide power to the digital controller or act as
a reference in the system.
The UCD8220-Q1 controller is compatible with the standard 3.3-V I/O ports of UCD9K
digital power controllers, DSPs, microcontrollers, or ASICs and is offered in the
PowerPAD™ integrated circuit package HTSSOP.
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