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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.

UCD3138128A

SLUSC99A –JULY 2016–REVISED JANUARY 2017

UCD3138128A Highly-Integrated Digital Controller For Isolated Power

1 Features

• 128 kB Program Flash Derivative of UCD3138xA

Family

– 4-32 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 UCD3138xA (+1 SPI, +1 I2C)

– Boot Flash Based Dual Memory Image

Support for ‘On the Fly’ Firmware Updates

• Synchronous Rectifier Dead Time Optimization

Peripheral to Use with UCD7138 Synchronous

Rectifier Driver

• Digital Control of up to 3 Independent Feedback

Loops

– Dedicated PID Based Hardware

– 2-pole/2-zero Configurable, Non-Linear Control

• Up to 16 MSPS Error A/D Converter (EADC)

– Configurable Resolution (min: 1 mV/LSB)

– Up to 8x Oversampling and Adaptive Sample

Positioning

– Hardware Based Averaging (up to 8x)

– 14 bit Effective Reference 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 Trailing/Leading/Triangular

Modulation

• RTC Support

• External Crystal Interface

• 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

• High Efficiency and Light Load Management

– Burst Mode and Ideal Diode Emulation

– Synchronous Rectifier Soft On/Off

– Low IC Standby Power

• Primary Side Voltage Sensing

• Current Share (Average and 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 UCD3138x Devices

• 15 channel, 12 bit, 539 ksps General Purpose

ADC

• Internal Temperature Sensor

• Fully Programmable High-Performance 31.25

MHz, 32-bit ARM7TDMI-S Processor

– 128 kB Program Flash (4-32 kB Banks)

– 2 kB Data Flash with ECC

– 8 kB Data RAM

– 8 kB Boot ROM Enables Firmware Boot-Load\

• Communication Peripherals,

– 2 - I

C/PMBus interfaces

– 2 - UARTs, 1 - SPI

• UART Auto Baud Rate Adjustment

• Timer Capture with Selectable Input Pins

• 80-pin QFP Package

• Operating Temperature: –40°C to 125°C

• Debug Interface

– Code Composer Studio with JTAG Interface

– Fusion Digital Power Designer GUI Support

UCD3138128A

Best in Class Firmware

Development Tools

Advanced Configuration &

Debug Tools

Advanced Topology Control

+ Forward, Flyback,

Half-bridge, etc...

Transformer

esr

UCD3138128A

SLUSC99A –JULY 2016–REVISED JANUARY 2017

www.ti.com

Product Folder Links: UCD3138128A

2 Applications

• Power Supplies and Telecom Rectifiers

• Power Factor Correction

• Isolated DC-DC Modules

• Phase Shifted Full Bridge with Peak Current Mode

Control, LLC, HSFB, Forward

Typical Applications and Tools

3 Description

The UCD3138xA is a digital power supply controller from Texas Instruments offering superior levels of integration

and performance in a single chip solution. The UCD3138128A offers 128 kB of program flash memory in

comparison to 32 kB in UCD3138A. and it also provides additional options for communication such as SPI and a

second I

C/PMBus port. The availability of of program Flash memory in multiple 32 kB banks enables designers

to implement dual images of firmware (that is, one main image + one back-up image) in the device and provides

the option 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 UCD3138xA family 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 UCD3138xA family is a fully programmable solution offering customers

complete control of their application, along with ample flexibility for many solutions. 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 Studio

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 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 250 ps pulse width resolution. The device also contains a 12-bit,

539 ksps general purpose ADC with up to 15 channels, timers, interrupt control, PMBus, I

C, 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, active clamp forward converter, two switch forward converter and LLC half bridge and full bridge.

UCD3138128A

SLUSC99A –JULY 2016–REVISED JANUARY 2017

www.ti.com

Product Folder Links: UCD3138128A

Table of Contents

1 Features.................................................................. 1

2 Applications ........................................................... 2

3 Description ............................................................. 2

4 Revision History..................................................... 4

5 Device Comparison ............................................... 5

6 Pin Configuration and Functions......................... 7

7 Specifications......................................................... 9

7.1 Absolute Maximum Ratings ...................................... 9

7.2 ESD Ratings.............................................................. 9

7.3 Recommended Operating Conditions..................... 10

7.4 Thermal Information................................................ 10

7.5 Electrical Characteristics......................................... 10

7.6 Timing Characteristics............................................. 13

7.7 PMBus/SMBus/I

C Timing...................................... 14

7.8 Typical Characteristics............................................ 15

7.9 Timing Diagrams..................................................... 16

8 Parametric Measurement Information ............... 17

8.1 Typical Clock Gating Power Savings...................... 18

9 Detailed Description............................................ 19

9.1 Overview ................................................................. 19

9.2 Functional Block Diagram ....................................... 21

9.3 Feature Description................................................. 22

9.4 Device Functional Modes........................................ 50

9.5 Register Maps......................................................... 57

10 Applications and Implementation...................... 60

10.1 Application Information.......................................... 60

10.2 Typical Application ............................................... 61

11 Power Supply Recommendations ..................... 72

12 Layout................................................................... 72

12.1 Device Grounding and Layout Guidelines ............ 72

12.2 Layout Examples................................................... 73

13 Device and Documentation Support ................. 74

13.1 Device Support...................................................... 74

13.2 Documentation Support ........................................ 74

13.3 Receiving Notification of Documentation Updates 76

13.4 Trademarks........................................................... 76

13.5 Electrostatic Discharge Caution............................ 76

13.6 Glossary................................................................ 76

14 Mechanical, Packaging, and Orderable

Information ........................................................... 76

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Original (June 2016) to Revision A Page

• Added two temperature ranges to the Internal oscillator frequency section. ....................................................................... 13

• Changed Figure 15 .............................................................................................................................................................. 29

• Changed Figure 35 to include DTC Adjustment .................................................................................................................. 51

• Changed capacitor from RESET to ground value from 0.22 µF to 2.2 µF. ......................................................................... 72

• Added updated V33 slew rate values in the Device Grounding and Layout Guidelines section. ........................................ 72

• Added bullet on unused GPIO pins ..................................................................................................................................... 72

• Changed "A" to part number ............................................................................................................................................... 73

UCD3138128A

www.ti.com

SLUSC99A –JULY 2016–REVISED JANUARY 2017

Product Folder Links: UCD3138128A

(1) Represents an alternate pin out that is programmable via firmware.

5 Device Comparison

Table 1. Product Family Comparison

UCD

FEATURE

3138

3138A

RHA/RMH

3138064

3138064A

RMH

3138

3138A

RGC

3138064

3138064A

RGC

3138064

RGZ

3138128

3138128A

PFC

3138A64

PFC

Package Offering

40 Pin QFN

(6mm x 6mm)

40 Pin QFN

(6mm x 6mm)

64 Pin QFN

( 9mm x 9mm)

64 Pin QFN

(9mm x 9mm)

48 Pin QFN

(7mm x 7mm)

80 Pin QFP

(14mm x 14mm)

(Includes leads)

80 Pin QFP

(14mm x 14mm)

(Includes leads)

ARM7TDMI-S Core Processor 31.25 MHz 31.25 MHz 31.25 MHz 31.25 MHz 31.25 MHz 31.25 MHz 31.25 MHz

High Resolution DPWM Outputs (250ps Resolution) 8 8 8 8 8 8 8

Number of High Speed Independent Feedback Loops

(# Regulated Output Voltages

3 3 3 3 3 3 3

12-bit, 256kps, General Purpose ADC Channels 7 7 14 14 9 15 15

Digital Comparators at ADC Outputs 4 4 4 4 4 4 4

Flash Memory (Program) 32 kB 64 kB 32 kB 64 kB 64 kB 128 kB 64 kB

Number of Memory 32kB Flash Memory Banks 1 2 1 2 2 4

Only 1 bank of 64 kB

Flash available

Flash Memory (Data) 2 kB 2 kB 2 kB 2 kB 2 kB 2 kB 2 kB

RAM 4 kB 4 kB 4 kB 4 kB 4 kB 8 kB 8 kB

Programmable Fault Inputs 1 + 2

(1)

1 + 2

(1)

4 2 + 2

(1)

1 + 2

(1)

4 4

High Speed Analog Comparators with Cycle-by-Cycle

Current Limiting

6 6 7 7 6 7 7

UART (SCI) 1

(1)

2 2 2 2 2

PMBus/I

1 1 1 1 1 1 1

Additional I

0 0 0 1

(1)

1 1

SPI 0 0 0 1

(1)

1 1

Timers

4 (16 bit) and

1 (24 bit)

4 (16 bit) and

1 (24 bit)

4 (16 bit) and

1 (24 bit)

4 (16 bit) and

1 (24 bit)

4 (16 bit) and

1 (24 bit)

4 (16 bit) and

2 (24 bit)

4 (16 bit) and

2 (24 bit)

Timer PWM Outputs 1

(1)

2 2 1

(1)

4 4

Timer Capture Inputs 2

(1)

1 + 3

(1)

1 + 3

(1)

2 + 2

(1)

2 + 2

(1)

Total Digital GPIOs 18 18 30 30 24 43 43

External Interrupts 0 0 1 1 0 1 1

External Crystal Clock Support no no no no no Yes (pins #61, 62) Yes (pins #61, 62)

Peak Current Mode Control EADC2 Only All EADC channels EADC Only All EADC channels All EADC Channels All EADC Channels All EADC Channels

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