Digital Controller for Isolated Power

Supply with PMBus Interface

Preliminary Technical Data

ADP1051

Rev. PrA

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FEATURES

Versatile, digital voltage mode controller

High speed, input voltage feed-forward control

6 PWM logic outputs with 625ps resolution

Switching frequency 50 kHz to 625 kHz

Frequency synchronization master & slave

Multiple energy saving modes

Adaptive dead-time compensation for efficiency

optimization

Low device power consumption - typical 100 mW

Direct Parallel operation

•

Accurate droop current share

•

Pre-bias start-up

•

Reverse current protection

•

Conditional over-voltage protection

Extensive fault detection and protections

Ultra compact package design 4*4mm 24-pin LFCSP

PMBus Compliant

Easy to use programming via Graphic User Interface (GUI)

High reliability EEPROM for programming & data storage

-40 °C ~ 125 °C operation temperature

APPLICATIONS

High density, Isolated DC/DC power supplies

•

Intermediate bus converters

•

High availability parallel power systems

Server, storage, industrial, networking, and communications

infrastructure

GENERAL DESCRIPTION

interface targeting high density, high efficiency DCDC power

conversion. This controller implements voltage mode control with

high speed, input line feed-forward for enhanced transient and

improved noise performance. The ADP1051 has 6 programmable

PWM outputs capable of controlling most high efficiency power

supply topologies with added control of synchronous rectification.

The device includes adaptive dead-time compensation to improve

the efficiency over the load range and programmable light load

mode operation combined with low device power consumption to

reduce system standby power losses.

The ADP1051 implements several features to enable a robust

system of parallel and redundant operation for customers that

require high availability or parallel connection. The device includes

master/slave synchronization, reverse current protection and pre-

bias start-up, accurate current sharing between power supplies and

conditional overvoltage techniques to identify and safely shutdown

an erroneous power supply in parallel operation mode.

The ADP1051 is based on flexible state machine architecture and is

register programmed using an intuitive, graphical-user interface.

The easy–to-use interface reduces design cycle time and results in a

robust, hardware coded system loaded into the built-in EEPROM.

The small size 4*4 mm LFCSP package makes the ADP1051 ideal

for ultra-compact, isolated DCDC power module or embedded

designs.

Figure 1. Typical Application Circuit

iCoupler

DC

INPUT

ADP1051

OUTA

OUTB

LOAD

AGND

RES

ADD

RTD

VCORE

CTRL

CS1

VS-

VS+

VDD

OVP

SDA

SCL

SYNI/FLGI

SR1

SR2

PG/ALT#

DRIVER

OUTC

OUTD

VF

CS2-

CS2+

DRIVER

PMBUS