The UCD3138 is a digital power supply controller from Texas Instruments offering
superior levels of integration and performance in a single-chip solution. The flexible nature of
the UCD3138 makes it suitable for a wide variety of power conversion applications. In addition,
multiple peripherals inside the device have been specifically optimized to enhance the performance
of AC-DC and isolated DC-DC applications and reduce the solution component count in the IT and
network infrastructure space.
The UCD3138 controller is a fully programmable solution offering customers complete
control of their application, along with ample ability to differentiate their solution. At the same
time, TI is committed to simplifying our customers’ development effort by offering best-in-class
development tools, including application firmware, Code Composer Studio™ software development
environment, and TI’s power development GUI which lets customers configure and monitor key system
parameters.
At the core of the UCD3138 controller are the digital control loop peripherals, also
known as Digital Power Peripherals (DPPs). Each DPP implements a high-speed digital control loop
consisting of a dedicated Error Analog-to-Digital Converter (EADC), a PID-based 2-pole/2-zero
digital compensator and DPWM outputs with 250-ps pulse width resolution. The device also contains a
12-bit, 267-ksps general-purpose ADC with up to 14 channels, timers, interrupt control, PMBus, and
UART communications ports. The device is based on a 32-bit ARM7TDMI-S RISC microcontroller that
performs real-time monitoring, configures peripherals, and manages communications. The ARM
microcontroller executes its program out of programmable flash memory as well as on-chip RAM and
ROM.
In addition to the FDPP, specific power management peripherals have been added to
enable high efficiency across the entire operating range, high integration for increased power
density, reliability, and lowest overall system cost and high flexibility with support for the
widest number of control schemes and topologies. Such peripherals include: light load burst mode,
synchronous rectification, LLC and phase-shifted full bridge mode switching, input voltage feed
forward, copper trace current sense, ideal diode emulation, constant current constant power
control, synchronous rectification soft on and off, peak current mode control, flux balancing,
secondary side input voltage sensing, high-resolution current sharing, hardware-configurable soft
start with pre bias, as well as several other features. Topology support has been optimized for
voltage mode and peak current mode controlled phase-shifted full bridge, single and dual phase PFC,
bridgeless PFC, hard-switched full bridge and half bridge, and LLC half bridge and full
bridge.
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