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).

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