Digital Controller for Power Supply Applications with PMBus Interface Data Sheet ADP1055 FEATURES Extended black box data recorder for fault recording User trimming on input and output voltages and currents 40C to +125C operation Digital current sharing PMBus Revision 1.2 compliant with PEC and extended manufacturer specific commands APPLICATIONS 32-bit password protection with command masking Isolated dc-to-dc power supplies and modules 64 address selections (16 base addresses, expandable to 64) Redundant power supply systems 6 PWM control signals, 625 ps resolution Frequency from 48 kHz to 1 MHz GENERAL DESCRIPTION Duty cycle double update rate The ADP1055 is a flexible, feature-rich digital secondary side Digital control loop (PID + additional pole or zero controller that targets ac-to-dc and isolated dc-to-dc secondary configurability) side applications. The ADP1055 is optimized for minimal Programmable loop filters (CCM, DCM, low/normal component count, maximum flexibility, and minimum design temperature) time. Features include differential remote voltage sense, primary Fast line voltage feedforward and secondary side current sense, pulse-width modulation (PWM) Adaptive dead time compensation for improved efficiency generation, frequency synchronization, redundant OVP, and Remote voltage sense current sharing. The control loop digital filter and compensation Redundant programmable OVP terms are integrated and can be programmed over the PMBus Current sense interface. Programmable protection features include Primary side cycle-by-cycle fast protection overcurrent (OCP), overvoltage (OVP) limiting, undervoltage Secondary side cycle-by-cycle fast overcurrent protection lockout (UVLO), and external overtemperature (OTP). Secondary side averaged reverse current protection using The built-in EEPROM provides extensive programming of the diode emulation mode with fixed debounce integrated loop filter, PWM signal timing, inrush current, and Synchronous rectifier control for improved efficiency soft start timing and sequencing. Reliability is improved through in light load mode a built-in checksum and programmable protection circuits. Nonlinear gain for faster transient response from DCM to CCM Frequency synchronization A comprehensive GUI is provided for easy design of loop filter Soft start and soft stop functionality characteristics and programming of the safety features. The Average and peak constant current mode industry-standard PMBus provides access to the many monitoring External PN junction temperature sensing and system test functions. The ADP1055 is available in a 32-lead 4 GPIOs (2 GPIOs configurable as active clamp snubber PWMs) LFCSP and operates from a single 3.3 V supply. TYPICAL APPLICATION DIAGRAM V OUT DC INPUT LOAD DRIVER SR1 SR2 VFF CS2 CS2+ OVP VS+ VS CS1 ISHARE OUTA SYNC OUTB DRIVER iCoupler ADP1055 OUTC NC OUTD VCORE RES ADD JTD JRTN GPIO1 TO GPIO4 CTRL SMBALRT SDA SCL VDD AGND DGND V DD PMBus Figure 1. Rev. A Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20142015 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 12004-001ADP1055 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Matched Cycle-by-Cycle Current Limit (OCP Equalization) ... 25 Applications ....................................................................................... 1 Low Temperature Filter ............................................................. 25 General Description ......................................................................... 1 Voltage Loop Autocorrection ................................................... 25 Typical Application Diagram .......................................................... 1 Nonlinear Gain/Response ......................................................... 26 Revision History ............................................................................... 3 Integrator Windup and Output Voltage Regulation Loss (Overshoot Protection) ............................................................. 26 Functional Block Diagram .............................................................. 4 Accurate Secondary Overcurrent Protection ......................... 26 Specif icat ions ..................................................................................... 5 Secondary Fast Overcurrent Protection .................................. 27 Absolute Maximum Ratings .......................................................... 10 Secondary Fast Reverse Current Protection ............................... 27 Thermal Resistance .................................................................... 10 Feedforward and Input Voltage Sense ..................................... 27 Soldering ...................................................................................... 10 Accurate Overvoltage and Undervoltage Protection ............. 28 ESD Caution ................................................................................ 10 Fast Overvoltage Protection ...................................................... 28 Pin Configuration and Function Descriptions ........................... 11 External Frequency Synchronization ...................................... 28 Typical Performance Characteristics ........................................... 13 Temperature Sensing ................................................................. 29 Controller Architecture ................................................................. 16 GPIO and PGOOD Signals ....................................................... 29 Start-Up and Power-Down Sequencing ...................................... 17 GPIO3 and GPIO4 as Snubber PWM Outputs ...................... 31 VDD and VCORE Pins .............................................................. 17 Average Constant Current Mode ............................................. 32 Power-Up and Power-Down Commands ............................... 17 32-Bit Key Code ......................................................................... 32 Power Sequencing ...................................................................... 17 SR Phase-In, SR Transition, and SR Fast Phase-In ................ 33 Power-Up and Soft Start Routine ............................................. 17 Output Voltage Slew Rate .......................................................... 33 Soft Stop Routine ........................................................................ 17 Adaptive Dead Time Compensation ....................................... 33 VDD/VCORE OVLO ................................................................ 18 SR Delay ....................................................................................... 34 Control Loop and PWM Operation............................................. 19 Current Sharing (ISHARE Pin) ................................................ 34 Voltage Sense, Feedback, and Control Loop ............................. 19 Droop Sharing ............................................................................ 36 Output Voltage Sense ................................................................. 19 Light Load Mode and Deep Light Load Mode ....................... 37 Digital Filter ................................................................................ 19 Pulse Skipping ............................................................................. 37 Digital Filter Programming Registers ...................................... 20 Soft Stop ....................................................................................... 37 Digital Compensation Filters During Soft Start ..................... 20 Duty Cycle Double Update Rate .............................................. 37 Filter Transition .......................................................................... 20 Duty Balance, Volt-Second Balance, and Flux Balancing ..... 38 PWM and Synchronous Rectifier Outputs (OUTA, OUTB, OUTC, OUTD, SR1, SR2) ......................................................... 21 Fault Responses and State Machine Mechanics ......................... 39 Synchronous Rectification ........................................................ 21 Priority of Faults ......................................................................... 39 Modulation Limit ....................................................................... 22 Flags ............................................................................................. 39 Switching Frequency Programming ........................................ 22 First Fault ID (FFID) ................................................................. 39 ADCs and Telemetry ...................................................................... 23 Fault Condition During Soft Start and Soft Stop ................... 40 ADCs for Current Sensing ........................................................ 23 Watchdog Timer ......................................................................... 40 ADCs for Voltage Sensing ......................................................... 24 Standard PMBus Flags ............................................................... 42 ADCs for Temperature Sensing ................................................ 24 Black Box Feature ........................................................................... 43 Theory of Operation ...................................................................... 25 Black Box Operation .................................................................. 43 Accurate Primary Overcurrent Protection ............................... 25 Black Box Contents .................................................................... 43 Primary Fast Overcurrent Protection ...................................... 25 Black Box Timing ....................................................................... 44 Rev. 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