Highly-Integrated Digital Controller for Isolated Power with 64kB Memory - UCD3138064

UCD3138064 (ACTIVE)

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, 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 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, 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.


  • 64 kB Program Flash Derivative of UCD3138 Family
    • 2-32 kB Program Flash Memory Banks
    • Supports Execution From 1 Bank, While Programming
    • Capability to Update Firmware Without Shutting Down
      the Power Supply
    • Additional Communication Ports Compared to the
      UCD3138 (+1 SPI, +1 I2C)
    • RGC Package Pin-to-Pin Compatible with UCD3138
  • Digital Control of up to 3 Independent Feedback Loops
    • Dedicated PID Based Hardware
    • 2-pole/2-zero Configurable, Non-Linear Control
  • Up to 16 MHz Error A/D Converter (EADC)
    • Configurable Resolution (Min: 1 mV/LSB)
    • Up to 8x Oversampling and Adaptive Trigger Positioning
    • Hardware Based Averaging (Up to 8x)
    • 14 bit Effective DAC
  • 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 and Dead-bands
    • Cycle-by-Cycle Duty Cycle Matching
    • Up to 2 MHz Switching Frequency
  • Configurable railing/Leading/Triangular Modulation
  • Configurable Feedback Control
    • Voltage, Average Current and Peak Current Mode
    • 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
  • High Efficiency and Light Load Management
    • Burst Mode & Ideal Diode Emulation
    • Synchronous Rectifier Soft On/Off
    • Low IC Standby Power
  • Primary Side Voltage Sensing
  • Flux and Phase Current Balancing for Non-Peak
    Current Mode Control Applications
  • 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
    UCD3138064 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 Enables Firmware Boot-Load
  • Communication Peripherals
    • 1 - I2C/PMBus, 1 - I2C
      (master mode only)
    • 2 - UARTs
    • 1 - SPI
  • Timer Capture with Selectable Input Pins
  • Built In Watchdog: BOD and POR
  • 64-pin QFN, 40-pin QFN, and 48-pin QFN Packages
  • Operating Temperature: –40°C to 125°C
  • Fusion Digital Power Designer GUI Support

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Parametrics Compare all products in Digital Power Isolated Controller

No. of Outputs
Frequency (Max) (kHz)
A/D Channels
Analog Comparators
DPWM Resolution (ps)
No. of Digital Power Peripheral feedback loops
Non-Volatile Memory
1 I2C
2 UART   
2-pole/2-zero (PID hardware)   
2kB (Data)
64kB (Program)   
32-bit ARM7