1.1 Features 1
• 64 kB Program Flash Derivative of UCD3138
Family
– 2-32 kB Program Flash Memory Banks
– Supports Execution From 1 Bank, While
Programming Another
– Capability to Update Firmware Without Shutting
Down the Power Supply
– Additional Communication Ports Compared to
the UCD3138 (+1 SPI, +1 I2C)
– Pin-to-Pin Compatible with UCD3138
(SLUSAP2B)
• Digital Control of up to 3 Independent Feedback
Loops
– Dedicated PID Based Hardware
– 2-pole/2-zero Configurable
– Non-Linear Control
• Soft Start / Stop with and without Prebias
• Fast Input Voltage Feed Forward Hardware
• Synchronous Rectifier Dead Time Optimization
Peripheral to Use with UCD7138 Synchronous
Rectifier Driver
• Up to 16 MHz Error A/D Converter (EADC)
– Configurable Resolution as Small as 1 mV/LSB
– Up to 8x Oversampling
– Hardware Based Averaging (Up to 8x)
– 14 bit Effective DAC With 4 Bits of Dither
– Adaptive Trigger Positioning
• Up to 8 High Resolution Digital Pulse Width
Modulated (DPWM) Outputs
– 250 ps Pulse Width Resolution
– 4 ns Frequency and Phase Resolution
– Adjustable Phase Shift Between Outputs
– Adjustable Dead-band Between Pairs
– Cycle-by-Cycle Duty Cycle Matching
– Up to 2 MHz Switching Frequency
• Configurable Trailing/Leading/Triangular
Modulation
• Configurable Feedback Control
– Voltage, Average Current and Peak Current
Mode Control
– Constant Current, Constant Power
• Configurable FM, Phase Shift Modulation and
PWM
• Fast, Automatic and Smooth Mode Switching
– Frequency Modulation and PWM
– Phase Shift Modulation and PWM
– Frequency Modulation and Phase Shift
Modulation
• High Efficiency and Light Load Management
– Burst Mode
– Ideal Diode Emulation
– Synchronous Rectifier Soft On/Off
– Low Device Standby Power
• Primary Side Voltage Sensing
• Flux and Phase Current Balancing
• Current Share (Average & Master/Slave)
• Feature Rich Fault Protection Options
– 7 Analog / 4 Digital Comparators
– Cycle-by-Cycle Current Limiting
– Programmable Blanking Time and Fault
Counting
– External Fault Inputs
• Synchronization of DPWM Waveforms Between
Multiple UCD3138064A Devices
• 14 channel, 12 bit, 267 ksps General Purpose
ADC with Integrated
– Programmable Averaging Filters
– Dual Sample and Hold
• Internal Temperature Sensor
• Fully Programmable High-Performance 31.25
MHz, 32-bit ARM7TDMI-S Processor
– 64 kB Program Flash (2-32 kB Banks)
– 2 kB Data Flash with ECC
– 4 kB Data RAM
– 8 kB Boot ROM
– Firmware Boot-Load in the Field via I2C or
UART
• Communication Peripherals
– 1 - I2C/PMBus, 1 - I2C (master mode only)
– 2 - UARTs
– 1 - SPI
• UART Auto-baud Rate Adjustment
• Timer Capture with Selectable Input Pins
• Built In Watchdog: BOD and POR
• 64-pin QFN and 48-pin QFN Packages
• Operating Temperature: –40°C to +125°C
• Debug interface
– Code Composer StudioTM with JTAG Interface
– Fusion Digital PowerTM Designer GUI Support

1.2 Applications
• Power Supplies and Telecom Rectifiers
• Power Factor Correction
• Isolated DC-DC Modules

1.3 Description
The UCD3138064A is a digital power supply controller from Texas Instruments offering superior levels of
integration and performance in a single-chip solution. The UCD3138064A, in comparison to Texas
Instruments UCD3138 digital power controller (Section 3), 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 UCD3138064A 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 UCD3138064A 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 through
offering best in class development tools, including application firmware, Code Composer StudioTM
software development environment, and TI’s Fusion Power Development GUI which let customers
configure and monitor key system parameters.
At the core of the UCD3138064A 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/general-purpose ADC with up to 14 channels2-zero digital compensator and
DPWM outputs with 250-ps pulse width resolution. The device also contains a 12-bit, 267-ksps generalpurpose
ADC with up to 14 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, automatic 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.
The UCD3138064A is a functional variant of the UCD3138064A Digital Power Controller that includes
significant improvements over the UCD3138064. For a description of the complete changes made in the
UCD3138064A, refer to UCD3138064A Migration Guide. The major improvements are:
The General Purpose ADC has been improved for better accuracy and performance at extreme cold
temperatures (–40°C).
The UART peripheral has been modified to include a hardware based auto-baud rate adjustment
feature.
A new Synchronous Rectifier Dead Time Optimization hardware peripheral has been added. Benefits
include: