Datasheet

UCD3138
SLUSAP2F –MARCH 2012 –REVISED NOVEMBER 2013 www.ti.com
Highly Integrated Digital Controller for Isolated Power
Check for Samples: UCD3138
1 Introduction
1.1 Features
1
– Synchronous Rectifier Soft On/Off
• Digital Control of up to 3 Independent
Feedback Loops – Low IC Standby Power
– Dedicated PID based hardware • Soft Start / Stop with and without Pre-bias
– 2-pole/2-zero configurable • Fast Input Voltage Feed Forward Hardware
– Non-Linear Control • Primary Side Voltage Sensing
• Up to 16MHz Error Analog to Digital Converter • Copper Trace Current Sensing
(EADC)
• Flux and Phase Current Balancing for Non-
– Configurable Resolution as Small as Peak Current Mode Control Applications
1mV/LSB
• Current Share Bus Support
– Automatic Resolution Selection
– Analog Average
– Up to 8x Oversampling
– Master/Slave
– Hardware Based Averaging (up to 8x)
• Feature Rich Fault Protection Options
– 14 bit Effective DAC
– 7 High Speed Analog Comparators
– Adaptive Sample Trigger Positioning
– Cycle-by-Cycle Current Limiting
• Up to 8 High Resolution Digital Pulse Width
– Programmable Fault Counting
Modulated (DPWM) Outputs
– External Fault Inputs
– 250ps Pulse Width Resolution
– 10 Digital Comparators
– 4ns Frequency Resolution
– Programmable blanking time
– 4ns Phase Resolution
• Synchronization of DPWM waveforms between
– Adjustable Phase Shift Between Outputs
multiple UCD3138 devices
– Adjustable Dead-band Between Pairs
• 14 channel, 12 bit, 267 ksps General Purpose
– Cycle-by-Cycle Duty Cycle Matching ADC with integrated
– Up to 2MHz Switching Frequency – Programmable averaging filters
• Configurable PWM Edge Movement – Dual sample and hold
– Trailing Modulation • Internal Temperature Sensor
– Leading Modulation • Fully Programmable High-Performance
31.25MHz, 32-bit ARM7TDMI-S Processor
– Triangular Modulation
– 32 kByte (kB) Program Flash
• Configurable Feedback Control
– 2 kB Data Flash with ECC
– Voltage Mode
– 4 kB Data RAM
– Average Current Mode
– 4 kB Boot ROM Enables Firmware Boot-Load
– Peak Current Mode Control
in the Field via I
2
C or UART
– Constant Current
• Communication Peripherals
– Constant Power
– I
2
C/PMBus
• Configurable Modulation Methods
– 2 UARTs on UCD3138RGC (64-pin QFN)
– Frequency Modulation
– 1 UART on UCD3138RHA/UCD3138RMH
– Phase Shift Modulation
(40-pin QFN)
– Pulse Width Modulation
• Timer capture with selectable input pins
• Fast, Automatic and Smooth Mode Switching
• Up to 5 Additional General Purpose Timers
– Frequency Modulation and PWM
• Built In Watchdog: BOD and POR
– Phase Shift Modulation and PWM
• 64-pin QFN and 40-pin QFN packages
• High Efficiency and Light Load Management
• Operating Temperature: –40°C to 125°C
– Burst Mode
• Fusion_Digital_Power_Designer GUI Support
– Ideal Diode Emulation
1
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PRODUCTION DATA information is current as of publication date. Products conform to
Copyright © 2012–2013, Texas Instruments Incorporated
specifications per the terms of the Texas Instruments standard warranty. Production
processing does not necessarily include testing of all parameters.