Highly-Integrated Digital Controller for Isolated Power with 64kB Memory

The UCD3138064 is a digital power

supply controller from Texas Instruments offering superior levels of integration and

performance in a single chip solution. The UCD3138064, in comparison to Texas

Instruments UCD3138 digital power controller (Section 6), offers 64 kB of program Flash memory (vs 32 kB in UCD3138) and additional

options for communication such as SPI and a second I2C port. The

availability of 64 kB of program Flash memory in 2-32 kB banks, enables the

designers to implement dual images of firmware (e.g. one main image + one back-up

image) in the device and the flexibility to execute from either of the banks using

appropriate algorithms. It also creates the unique opportunity for the processor to

load a new program and subsequently execute that program without interrupting power

delivery. This feature allows the end user to add new features to the power supply

in the field while eliminating any down-time required to load the new program.

The flexible nature of the UCD3138064

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 UCD3138064 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 customer’s development effort through

offering best in class development tools, including application firmware, Code

Composer StudioTM software development environment, and TI’s Fusion Power

Development GUI which enables customers to configure and monitor key system

parameters.

At the core of the UCD3138064

controller are the Digital Power Peripherals (DPP). 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 250ps

pulse width resolution. The device also contains a 12-bit, 267 ksps general purpose

ADC with up to 15 channels, timers, interrupt control, PMBus, I2C, SPI

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 DPP, 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.