ADP1050ACPZ-R7 datasheet(13/93 Pages) AD

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ADP1050

Data Sheet

THEORY OF OPERATION

The ADP1050 is designed as a flexible, easy to use, digital power

supply controller. The ADP1050 integrates the typical functions

that are needed to control a power supply, such as

•

Output voltage sense and feedback

•

Voltage feedforward control

•

Digital loop filter compensation

•

PWM generation

•

Current, voltage, and temperature sense

•

Housekeeping and I2C/PMBus interface

•

Calibration and trimming

The main function of controlling the output voltage is performed

by the feedback ADCs, the digital loop compensator, and the

digital PWM engine.

The feedback ADCs feature a patented multipath architecture,

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

low speed, high resolution (slow and accurate) ADC. The ADC

outputs are combined to form a high speed and high resolution

feedback path. Loop compensation is implemented using the

digital compensator. This proportional, integral, derivative (PID)

compensator is implemented in the digital domain to allow easy

programming of filter characteristics, which is of great value in

customizing and debugging designs. The PWM engine generates

up to four programmable PWM outputs for control of primary

side FET drivers and synchronous rectification FET drivers. This

programmability allows many generic and specific switching

power supply topologies to be realized.

Conventional power supply housekeeping features, such as input

voltage sense, output voltage sense, primary side current sense,

and secondary side current sense, are included. An extensive set

of protections is included, such as overvoltage protection (OVP),

overcurrent protection (OCP), overtemperature protection (OTP),

and undervoltage protection (UVP).

These features are programmable through the I2C/PMBus

digital bus interface. This interface is also used for calibrations.

Other information, such as input current, output current, and

fault flags, is also available through this digital bus interface.

The internal EEPROM can store all programmed values and allows

standalone control without a microcontroller. A free, downloadable

GUI is available that provides all the necessary software to program

the ADP1050. To obtain the latest GUI software and a user guide,

visit http://www.analog.com/digitalpower.

The ADP1050 operates from a single 3.3 V power supply and is

specified from −40°C to +125°C.

RTD

SDA

SCL

SYNI/FLGI

SR2

SR1

ADD

VCORE

AGND

RES

PWM

ENGINE

ADC

OSC

DIGITAL CORE

VREF

PMBus

8kB

EEPROM

VS–

VS+

OVP

CS1

OUTA

ADC

OUTB

CTRL

VDD

UVLO

LDO

DAC

ADC

PG/ALT

Figure 10. Functional Block Diagram

Rev. A | Page 12 of 92

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