ANALOG DEVICES ADP1047 Service Manual

Digital Power Factor Correction Controller

Preliminary Technical Data

FEATURES

Flexible, single phase, digital power factor correction (PFC)

controller
True rms ac power metering
Enhanced dynamic response
Optimized light load efficiency performance

Output voltage adjustment

Frequency reduction
Inrush control
Switching frequency spread spectrum for improved EMI
External frequency synchronization
PMBus compliant

Programmable ac line fault detection and protection

Programmable output fault detection and protection
Extensive fault protection for high reliability systems
Frequency range from 30 kHz to 400 kHz
8 kB EEPROM
Programming via easy-to-use graphical user interface (GUI)

APPLICATIONS

AC/DC power supplies for applications including

Computing server and storage

Network and communication infrastructure

Industrial and medical

GENERAL DESCRIPTION

The ADP1047 is a digital power factor correction controller
providing accurate input power metering capability and inrush
control targeting ac/dc systems.

The digital PFC function is based on a conventional boost PFC
with multiplication of the output voltage feedback combined
with the input current and voltage to provide optimum harmonic
correction and power factor for ac/dc systems. All signals are
converted into the digital domain to provide maximum

With Accurate AC Power Metering

ADP1047

flexibility—all key parameters can be reported and adjusted via
the PMBus interface. This allows users to optimize system per­formance, maximize efficiency across the load range, and reduce
design time to market.

The ADP1047 provides accurate, rms measurement of input
voltage, current and power. This information can be reported
to the secondary of the power supply via the PMBus interface.

The combination of a flexible, digitally controlled PFC engine
and accurate input power metering facilitate the adoption of
intelligent power management systems capable of making decisions
to improve end user system efficiency. The device targets further
efficiency improvements through programmable frequency
reduction at light load and the capability to reduce the output
voltage at low loads.

The ADP1047 provides enhanced integrated features and
functions; the Inrush and soft start control functions provide
significant component count reduction with easy design
optimization.

The device targets high reliability, redundant power supply
applications and has extensive and robust protection circuitry:
independent overvoltage protection, overcurrent (ILIM), ground
continuity metering, and ac sensing. Internal overtemperature
is provided and external temperature can be recorded via an
external sensing device.

The internal 8 kB EEPROM stores all the programmed values
and allows standalone control without a microcontroller. All
parametric reporting and adjustments are programmed via an
easy-to-use GUI—no complex programming is required.

The ADP1047 operates from a single 3.3 V supply. The device is
available in a 24-lead QSOP package specified over ambient
temperature range −40°C to +85°C.

Rev. PrA

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ADP1047 Preliminary Technical Data

TABLE OF CONTENTS

Features.............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 3

Specifications..................................................................................... 4

Absolute Maximum Ratings ............................................................7

ESD Caution...................................................................................7

Pin Configuration And Function Descriptions ............................8

Theory of Operation .........................................................................9

Outline Dimensions....................................................................... 10

Rev. PrA | Page 2 of 12

Preliminary Technical Data ADP1047

FUNCTIONAL BLOCK DIAGRAM

OVP

PGND

DAC

ADP1047

CS- CS+

ILIM

VAC PGND

VFB

INRUSH

PWM

PWM2

VDD

VCORE

RES

UVLO

LDO

PWM

ENGINE

VREF

ADC

CS

OCP

ADC

ADC

VAC

DIGITALCORE

8kb EEPROM

I2C

INTERFACE

ADC

ADC

VFB

OLP OVP

OSC

PGOOD

AC_OK

SYNC

PSON
SCL

SDA

ADD

RTD

Figure 1.

AGND

DGND

Rev. PrA | Page 3 of 12

ADP1047 Preliminary Technical Data

SPECIFICATIONS

VDD = 3.3 V TA = -40°C to +85°C, unless otherwise noted.

Table 1.

Parameter Symbol Test Conditions/Comments Min Typ Max Units

POWER SUPPLY

Operating Supply Voltage VDD 3.0 3.3 3.6 V
Supply Current IDD Normal operation (PSON high) 17 mA
Peak Supply Current I

POWER-ON RESET

POWER ON RESET VDD rising 1.8 2.95 V
UVLO VDD falling 2.80 2.85 2.90 V

OVLO 3.7 3.9 4.1 V

VAC PIN LEAKAGE CURRENT μA

OVLO Debouncing (VDD and V

) Programmable 2 500 μs

CORE

VCORE

Output Voltage Temperature = 25°C 2.3 2.5 2.7 V

PWM OUTPUT

Output Voltage

Low V
High V

Rise Time C
Fall Time C

DUTY CYCLE

Minimum Off Time Programmable 40 1200 ns
Minimum On Time Programmable 0 1200 ns

VOLTAGE SENSE INPUT RANGE

VAC

Input Voltage 0 1.6 V

VFB

Input Voltage 0 1.6 V

RTD

Input Voltage 0 1.6 V

SWITCHING FREQUENCY

Frequency Range Programmable (see Table TBD) 30 400 kHz
Accuracy −3% +3%

OSCILLATOR, CLOCK AND PLL

Oscillator Frequency 1.51 1.56 1.61 MHz
Digital Clock Frequency 200 MHz
PLL Frequency 200 MHz

RES

Output Voltage Temperature = 25°C – RES = 50 kΩ 0.98 1.0 1.02 V
Temperature Stability 320 ppm/°C

CURRENT SENSE ADC

Input Voltage Range Low Line Programmable 750 mV
Input Voltage Range High Line Programmable 500 mV
Current Source High Line 10 kΩ level shift resistor, V
Current Source Low Line 10 kΩ level shift resistor, V
Current Source Accuracy ±0.03 %

PWM

Output Low Level 0.8 V
Output High Level 2.0 V

During EEPROM programming (10 ms) 27 37 mA

DD_PK

Sink current = 10 mA 0.4 V

PWMOL

Source current = 10 mA

PWMOH

= 50 pF 3.5 ns

LOAD

= 50 pF 1.5 ns

LOAD

CS+

CS+

VDD − 0.4 V

− V

= 0 V 75 μA

CS−

− V

= 0 V 62.5 μA

CS−

V

Rev. PrA | Page 4 of 12