Document
Data Sheet
Digital Controller for Power Supply Applications with PMBus Interface
ADP1055
FEATURES
−40°C to +125°C operation PMBus Revision 1.2 compliant with PEC and extended
manufacturer specific commands 32-bit password protection with command masking 64 address selections (16 base addresses, expandable to 64) 6 PWM control signals, 625 ps resolution Frequency from 48 kHz to 1 MHz Duty cycle double update rate Digital control loop (PID + additional pole or zero
configurability) Programmable loop filters (CCM, DCM, low/normal
temperature) Fast line voltage feedforward Adaptive dead time compensation for improved efficiency Remote voltage sense Redundant programmable OVP Current sense
Primary side cycle-by-cycle fast protection Secondary side cycle-by-cycle fast overcurrent protection Secondary side averaged reverse current protection using
diode emulation mode with fixed debounce Synchronous rectifier control for improved efficiency
in light load mode Nonlinear gain for faster transient response from DCM to CCM Frequency synchronization Soft start and soft stop functionality Average and peak constant current mode External PN junction temperature sensing 4 GPIOs (2 GPIOs configurable as active clamp snubber PWMs)
Extended black box data recorder for fault recording User trimming on input and output voltages and currents Digital current sharing
APPLICATIONS
Isolated dc-to-dc power supplies and modules Redundant power supply systems
GENERAL DESCRIPTION
The ADP1055 is a flexible, feature-rich digital secondary side controller that targets ac-to-dc and isolated dc-to-dc secondary side applications. The ADP1055 is optimized for minimal component count, maximum flexibility, and minimum design time. Features include differential remote voltage sense, primary and secondary side current sense, pulse-width modulation (PWM) generation, frequency synchronization, redundant OVP, and current sharing. The control loop digital filter and compensation terms are integrated and can be programmed over the PMBus™ interface. Programmable protection features include overcurrent (OCP), overvoltage (OVP) limiting, undervoltage lockout (UVLO), and external overtemperature (OTP).
The built-in EEPROM provides extensive programming of the integrated loop filter, PWM signal timing, inrush current, and soft start timing and sequencing. Reliability is improved through a built-in checksum and programmable protection circuits.
A comprehensive GUI is provided for easy design of loop filter characteristics and programming of the safety features. The industry-standard PMBus provides access to the many monitoring and system test functions. The ADP1055 is available in a 32-lead LFCSP and operates from a single 3.3 V supply.
TYPICAL APPLICATION DIAGRAM
DC INPUT
VOUT
LOAD
DRIVER
iCoupler ®
DRIVER
SR1 SR2 CS1
OUTA OUTB OUTC OUTD
VFF
CS2– CS2+
ADP1055
RES ADD JTD JRTN GPIO1 TO GPIO4 CTRL SMBALRT
OVP SDA SCL
VS+ VS– ISHARE
SYNC
NC VCORE VDD AGND DGND
VDD
12004-001
Figure 1.
PMBus
Rev. A
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ADP1055
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Typical Application Diagram .......................................................... 1 Revision History ............................................................................... 3 Functional Block Diagram .............................................................. 4 Specifications..................................................................................... 5 Absolute Maximum Ratings.......................................................... 10
Thermal Resistance .................................................................... 10 Soldering...................................................................................... 10 ESD Caution................................................................................ 10 Pin Configuration and Function Descriptions........................... 11 Typical Performance Characteristics ........................................... 13 Controller Architecture ..................................