ADP1046AACPZ-R7 datasheet(14/88 Pages) AD

14 / 88 page

ADP1046A

Data Sheet

Rev. 0 | Page 14 of 88

THEORY OF OPERATION

The ADP1046A is a secondary side controller for switch mode

power supplies. It is designed for use in isolated redundant

applications. The ADP1046A integrates the typical functions

that are needed to control a power supply, such as

•

Output voltage sense and feedback

•

Voltage line feedforward control

•

Digital loop filter compensation

•

PWM generation

•

Current sharing

•

Current, voltage, and temperature sense

•

OrFET control

•

Housekeeping and I2C interface

•

Calibration and trimming

The main function of controlling the output voltage is performed

using the feedback ADCs, the digital loop filter, and the PWM

block.

The feedback ADCs use a multipath approach (patent pending).

The ADP1046A combines a high speed, low resolution (fast and

coarse) ADC with a low speed, high resolution (slow and accurate)

ADC. Loop compensation is implemented using the digital filter.

This proportional, integral, derivative (PID) filter is implemented

in the digital domain to allow easy programming of filter charac-

teristics, which is of great value in customizing and debugging

designs.

The PWM block generates up to seven programmable PWM

outputs for control of FET drivers and synchronous rectification

FET drivers. This programmability allows many traditional and

unique switching topologies to be realized.

A current share bus interface is provided for paralleling multiple

power supplies. The ADP1046A also has hot-swap OrFET sense

and control for N + 1 redundant power supplies.

Conventional power supply housekeeping features, such as remote

and local voltage sense and primary and secondary side current

sense, are included. An extensive set of protections is offered,

including overvoltage protection (OVP), overcurrent protection

(OCP), overtemperature protection (OTP), undervoltage protec-

tion (UVP), ground continuity monitoring (voltage continuity),

and ac sense.

All these features are programmable through the I2C bus inter-

face. This bus interface is also used to calibrate the power supply.

Other information that is useful for power monitoring, such as

input current, output current, and fault flags, is also available

through the I2C bus interface.

The internal EEPROM can store all programmed values and

allows standalone control without a microcontroller. A free,

downloadable GUI is available and provides all the necessary

software to program the ADP1046A. To obtain the latest software

and a user guide, visit http://www.analog.com/digitalpower.

The ADP1046A operates from a single 3.3 V supply and is

specified from −40°C to +125°C.

RES

VS3–

VS3+

PGOOD1

VDD

OUTA

OUTB

SR1

SR2

OUTC

OUTD

CS1

PSON

SCL

SDA

VCORE

AGND

OUTAUX

PGOOD2

SHAREi

FLAGIN

DGND

RTD

ADD

ADC

UVLO

PWM

ENGINE

VREF

LDO

ADC

8kB

EEPROM

DIGITAL

CORE

I2C

INTERFACE

PWM

OSC

1.2V

+ –

0.45V

–

V_OVP

SHAREo

ADP1046A

Figure 13. Simplified Block Diagram

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