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Digital Controller for Power Supply
Applications with PMBus Interface
Data Sheet
ADP1055
Rev. A Document Feedbac
k
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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
Figure 1.
RES ADD JTD GPIO1 TO GPIO4 SDA SCL VDD AGND DGND
OUTA
OUTB
OUTC
OUTD
CS1
SR1 SR2 VFF
ISHARE
V
OUT
SYNC
NC
VCORE
DRIVER
iCoupler
®
DRIVER
VS+
DC
INPUT
LOAD
OVPCS2– CS2+ VS–
JRTN
V
DD
12004-001
ADP1055
CTRL SMBALRT
PMBus
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