Data Sheet
FEATURES
Integrates all typical controller functions
Digital control loop
Remote and local voltage sense
Primary and secondary side current sense
PWM control
Synchronous rectifier control
Current sharing
Integrated programmable loop filter
2
I C interface
Extensive fault detection and protection
Extensive programming
Fast calibration
EEPROM
Standalone or microcontroller control
Digital Controller for Isolated
Power Supply Applications
ADP1043A
GENERAL DESCRIPTION
The ADP1043A is a secondary side power supply controller IC
designed to provide all the functions that are typically needed in
an ac-to-dc or isolated dc-to-dc control application.
The ADP1043A is optimized for minimal component count,
maximum flexibility, and minimum design time. Features
include remote voltage sense, local voltage sense, primary and
secondary side current sense, pulse-width modulation (PWM)
generation, and hot-swap sense and control. The control loop is
digital with an integrated programmable digital filter. Protection
features include current limiting, ac sense, undervoltage lockout
(UVLO), and overvoltage protection (OVP).
The built-in EEPROM provides extensive programming of the
integrated loop filter, PWM signal timing, inrush current, and
soft start timing and sequencing. Reliability is improved through
a built-in checksum and redundancy of critical circuits.
A comprehensive GUI is provided for easy design of loop filter
characteristics and programming of the safety features. The
industry-standard I
2
C bus provides access to the many moni-
toring and system test functions.
The ADP1043A is available in a 32-lead LFCSP and operates
from a single 3.3 V supply.
APPLICATIONS
AC-to-DC power supplies
Isolated dc-to-dc power supplies
Redundant power supplies
Parallel power supplies
Server, storage, network, and communications infrastructure
TYPICAL APPLICATION CIRCUIT
PFC
AC
INPUT
LOAD
DRIVER
DRIVER
SR1 SR2
CS1
OUTA
OUTB
OUTC
OUTD
OUTAUX
RES ADD RTD VCORE FLAGIN PSON PGOOD2 PGOOD1 SDA SCL
ACSNS
PGND CS2– CS2+
VS1
GATE
VS2
VS3+
VS3–
SHAREo
SHAREi
DRIVER
ADuM1410
VDD DGND AGND
V
DD
08501-001
MICROCONTROLLER
Figure 1.
Rev. A
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ADP1043A
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Typical Application Circuit ............................................................. 1
Revision History ............................................................................... 3
Functional Block Diagram .............................................................. 4
Specifications..................................................................................... 5
Absolute Maximum Ratings ............................................................ 8
Thermal Resistance ...................................................................... 8
Soldering ........................................................................................ 8
ESD Caution .................................................................................. 8
Pin Configuration and Function Descriptions ............................. 9
Typical Performance Characteristics ........................................... 11
Theory of Operation ...................................................................... 12
Current Sense .............................................................................. 12
Voltage Sense and Control Loop .............................................. 13
ADCs ............................................................................................ 13
Digital Filter ................................................................................ 14
PWM and Sync Rect Outputs (OUTA, OUTB, OUTC,
OUTD, OUTAUX, SR1, SR2) ................................................... 14
Synchronous Rectification ........................................................ 15
Adaptive Dead Time Control.................................................... 15
Light Load Mode ........................................................................ 15
Modulation Limit ....................................................................... 15
OrFET Control (GATE) ............................................................ 15
VDD ............................................................................................. 18
VDD/VCORE OVLO ................................................................ 18
Power Good ................................................................................. 18
Soft Start ...................................................................................... 19
Current Sharing (Share) ............................................................ 20
Power Supply System and Fault Monitoring ............................... 22
Flags.............................................................................................. 22
Monitoring Functions ................................................................ 22
Voltage Readings ........................................................................ 22
Current Readings ........................................................................ 22
Power Readings........................................................................... 23
Power Monitoring Accuracy ..................................................... 23
First Flag Fault ID and Value Registers ................................... 23
External Flag Input (FLAGIN Pin) .......................................... 23
Temperature Readings (RTD Pin)............................................ 23
Data Sheet
Overtemperature Protection (OTP) ........................................ 23
Overcurrent Protection (OCP) ................................................ 24
Constant Current Mode ............................................................ 25
Overvoltage Protection (OVP) ................................................. 25
Undervoltage Protection (UVP) .............................................. 25
AC Sense (ACSNS)..................................................................... 26
Volt-Second Balance .................................................................. 26
Load Line ..................................................................................... 26
Power Supply Calibration and Trim ............................................ 27
CS1 Trim ...................................................................................... 27
CS2 Trim ...................................................................................... 27
Voltage Calibration and Trim ................................................... 27
Output Voltage Setting (VS3+, VS3− Trim) ........................... 28
VS1 Trim...................................................................................... 28
VS2 Trim...................................................................................... 28
RTD/OTP Trim .......................................................................... 28
Layout Guidelines....................................................................... 28
Communication .............................................................................. 29
I
2
C Interface ................................................................................ 29
EEPROM ..................................................................................... 31
Software GUI .............................................................................. 32
Register Listing ............................................................................... 33
Detailed Register Descriptions ..................................................... 35
Fault Registers ............................................................................. 35
Value Registers ............................................................................ 38
Current Sense and Current Limit Registers............................ 41
Voltage Sense Registers.............................................................. 46
ID Registers ................................................................................. 49
PWM and Synchronous Rectifier Timing Registers ............. 50
Digital Filter Programming Registers...................................... 58
Adaptive Dead Time Registers ................................................. 60
EEPROM Registers .................................................................... 64
Resonant Mode Operation ............................................................ 65
Resonant Mode Enable .............................................................. 65
PWM Timing in Resonant Mode............................................. 65
Synchronous Rectification in Resonant Mode ....................... 65
Adjusting the Timing of the PWM Outputs ........................... 66
Frequency Limit Setting ............................................................ 66
Feedback Control in Resonant Mode ...................................... 66
Soft Start in Resonant Mode ..................................................... 66
Rev. A | Page 2 of 72
Data Sheet
Light Load Operation (Burst Mode) ........................................66
OUTAUX in Resonant Mode ....................................................66
Protections in Resonant Mode ..................................................66
ADP1043A
Resonant Mode Register Descriptions ..................................... 67
Outline Dimensions ........................................................................ 71
Ordering Guide ........................................................................... 71
REVISION HISTORY
5/2017—Rev. 0 to Rev. A
Changed CP-32-2 to CP-32-7 ...................................... Throughout
Updated Outline Dimensions ........................................................71
Changes to Ordering Guide ...........................................................71
10/2009—Revision 0: Initial Version
Rev. A | Page 3 of 72
ADP1043A
The ADP1043A is a secondary side controller for switch mode
power supplies (SMPS). It is designed for use in isolated redun-
dant applications. The ADP1043A integrates the typical functions
that are needed to control a power supply. These include
•
•
•
•
•
•
•
•
Output voltage sense and feedback
Digital loop filter compensation
PWM generation
Current sharing
Current, voltage, and temperature sense
OrFET control
Housekeeping and I
2
C interface
Calibration and trimming
Data Sheet
A current share bus interface provides for parallel power supplies.
The part 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, and ac sense.
All these features are programmable through the I
2
C bus inter-
face. This bus interface is also used to calibrate the power supply.
Other information, such as input current, output current, and
fault flags, is also available through the I
2
C 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 ADP1043A. For more information
about the GUI, contact Analog Devices, Inc., for the latest
software and a user guide.
The ADP1043A operates from a single 3.3 V supply and is
specified from −40°C to +85°C.
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 ADP1043A combines a high speed, low resolution
(fast and coarse) ADC and a low speed, high resolution (slow and
accurate) ADC. Loop compensation is implemented using the
digital filter. This PID (proportional, integral, derivative) filter 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 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.
FUNCTIONAL BLOCK DIAGRAM
ACSNS
PGND
CS2+
VS1
GATE
CS2–
VS2
ADC
ADC
VREF
CS1
SR1
SR2
OUTA
OUTB
OUTC
OUTD
OUTAUX
VDD
ADC
ADC
ADC
VS3+
VS3–
SHAREo
PWM
ENGINE
DIGITAL
CORE
8kB
EEPROM
I
2
C
INTERFACE
ADC
PWM
SHAREi
PGOOD1
PGOOD2
UVLO
LDO
FLAGIN
DGND
OSC
VCORE
RES
AGND
PSON
SCL
08501-002
SDA
ADD
RTD
Figure 2.
Rev. A | Page 4 of 72
Data Sheet
SPECIFICATIONS
V
DD
= 3.3 V, T
A
= −40°C to +85°C, unless otherwise noted. FSR = full-scale range.
Table 1.
Parameter
SUPPLY
V
DD
I
DD
Symbol
V
DD
I
DD
Test Conditions/Comments
Min
3.1
Normal operation (PSON is high)
Power supply off (PSON is low)
During EEPROM programming (40 ms)
V
DD
rising
V
DD
falling
3.05
2.75
3.7
T
A
= 25°C
RES = 49.9 kΩ
2.3
190
Typ
3.3
20
15
I
DD
+ 8
ADP1043A
Max
3.6
Unit
V
mA
mA
mA
V
V
mV
V
V
MHz
POWER-ON RESET
Power-On Reset
UVLO
UVLO Hysteresis
OVLO
VCORE PIN
Output Voltage
OSCILLATOR AND PLL
PLL Frequency
OUTA, OUTB, OUTC, OUTD,
OUTAUX, SR1, SR2 PINS
Output Low Voltage
Output High Voltage
Rise Time
Fall Time
AC SENSE
Input Voltage Threshold
Propagation Delay
VS1, VS2, VS3 LOW SPEED ADC
Input Voltage Range
Sampling Frequency
Voltage Sense Measurement
Accuracy
2.85
35
3.9
2.5
200
2.95
4.1
2.7
210
V
OL
V
OH
Source current = 10 mA
Source current = 10 mA
C
LOAD
= 50 pF
C
LOAD
= 50 pF
PWM and resonant mode
From ACSNS threshold to SR start;
resonant mode only
0.4
V
DD
− 0.4
3.5
1.5
0.3
0.45
160
0.65
V
V
ns
ns
V
ns
V
IN
f
SAMP
Differential voltage from VS1, VS2 to PGND,
and from VS3+ to VS3−
From 0% to 100% of input voltage range
0
1
100
1.55
V
Hz
% FSR
mV
% FSR
mV
% FSR
mV
Bits
mV
μs
%
μs
%
−10
−155
−2.5
−38.75
−1.5
−23.25
12
−200
+10
+155
+2.5
+38.75
+1.5
+23.25
From 10% to 90% of input voltage range
From 900 mV to 1.1 V
Voltage Sense Measurement
Resolution
Voltage Differential from VS3−
to PGND
VS1 OVP Comparator Speed
VS1 OVP Threshold Accuracy
VS2 and VS3 OVP Comparator
Speed
VS2 and VS3 OVP Threshold
Accuracy
VS1 HIGH SPEED ADC
Sampling Frequency
Resolution
Dynamic Range
+200
300
2.5
300
2.5
Register 0x2C[2] = 0
Relative to nominal voltage (1 V) on VS1
Register 0x2C[2] = 0
Relative to nominal voltage (1 V) on VS2
and VS3
f
SAMP
400
6
±18
Rev. A | Page 5 of 72
kHz
Bits
mV
Microcontroller MCU
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