UCD3138 Controller Datasheet

UCD3138 Datasheet PDF, Equivalent

Part Number



Highly Integrated Digital Controller



Total Page 30 Pages
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Tools &
Support &
UCD3138 Highly Integrated Digital Controller for Isolated Power
1 Device Overview
1.1 Features
• Digital Control of up to 3 Independent Feedback
– Dedicated PID-Based hardware
– 2-Pole/2-Zero Configurable
– Nonlinear Control
• Up to 16 MHz Error Analog-to-Digital Converter
– Configurable Resolution as Small as 1mV/LSB
– Automatic Resolution Selection
– Up to 8x Oversampling
– Hardware-Based Averaging (up to 8x)
– 14-Bit Effective Digital-to-Analog Converter
– Adaptive Sample Trigger Positioning
• Up to 8 High Resolution Digital Pulse Width
Modulated (DPWM) Outputs
– 250-ps Pulse Width Resolution
– 4-ns Frequency Resolution
– 4-ns 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 PWM Edge Movement
– Trailing Modulation
– Leading Modulation
– Triangular Modulation
• Configurable Feedback Control
– Voltage Mode
– Average Current Mode
– Peak Current Mode Control
– Constant Current
– Constant Power
• Configurable Modulation Methods
– Frequency Modulation
– Phase Shift Modulation
– Pulse Width Modulation
• 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
• Soft Start / Stop with and without Prebias
• Fast Input Voltage Feed Forward Hardware
• Primary Side Voltage Sensing
• Copper Trace Current Sensing
• Flux and Phase Current Balancing for Nonpeak
Current Mode Control Applications
• Current Share Bus Support
– Analog Average
– Master and Slave
• Feature Rich Fault Protection Options
– 7 High-Speed Analog Comparators
– Cycle-by-Cycle Current Limiting
– Programmable Fault Counting
– External Fault Inputs
– 10 Digital Comparators
– Programmable Blanking Time
• Synchronization of DPWM Waveforms Between
Multiple UCD3138 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
– 32KB of Program Flash
– 2KB of Data Flash with ECC
– 4KB of Data RAM
– 4KB of Boot ROM Enables Firmware Boot-Load
in the Field via I2C or UART
• Communication Peripherals
– I2C/PMBus
– 2 UARTs on UCD3138RGC (64-Pin QFN)
– 1 UART on UCD3138RHA/UCD3138RMH
(40-Pin QFN) and UCD3138RJA (40-Pin VQFN)
• Timer Capture with Selectable Input Pins
• Up to 5 Additional General Purpose Timers
• Built In Watchdog: BOD and POR
• 64-Pin QFN and 40-Pin QFN Packages
• Operating Temperature: –40°C to 125°C
• Fusion_Digital_Power_Designer GUI Support
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

1.2 Applications
• Power Supplies and Telecom Rectifiers
• Power Factor Correction
• Isolated DC-DC Modules
1.3 Description
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
Device Information(1)
VQFN (64)
9.00 mm × 9.00 mm
VQFN (40)
WQFN (40)
VQFN (40) (2)
6.00 mm × 6.00 mm
6.00 mm × 6.00 mm
6.00 mm × 6.00 mm
(1) For more information, see Section 11, Mechanical Packaging and Orderable Information.
(2) Recommended for new 40-pin designs, optimized for improved performance under temperature cycling test for board level reliability
2 Device Overview
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Product Folder Links: UCD3138
Copyright © 2012–2017, Texas Instruments Incorporated

Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity UCD3138 SLUSAP2I – MARCH 2012 – REVISED JANUARY 2017 UCD3138 Highl y Integrated Digital Controller for Iso lated Power 1 Device Overview 1.1 Fea tures 1 • Digital Control of up to 3 Independent Feedback Loops – Dedicate d PID-Based hardware – 2-Pole/2-Zero Configurable – Nonlinear Control • Up to 16 MHz Error Analog-to-Digital Co nverter (EADC) – Configurable Resolut ion as Small as 1mV/LSB – Automatic R esolution Selection – Up to 8x Oversa mpling – Hardware-Based Averaging (up to 8x) – 14-Bit Effective Digital-to -Analog Converter (DAC) – Adaptive Sa mple Trigger Positioning • Up to 8 Hi gh Resolution Digital Pulse Width Modul ated (DPWM) Outputs – 250-ps Pulse Wi dth Resolution – 4-ns Frequency Resol ution – 4-ns Phase Resolution – Adj ustable Phase Shift Between Outputs – Adjustable Dead-band Between Pairs – Cycle-by-Cycle Duty Cycle Matching – Up to 2-MHz Switching Frequency • Configurable PWM Edge Movement .
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