ADP1043A Analog Devices, ADP1043A Datasheet - Page 4

• Manufacturer Part Number: ADP1043A
• Description: Digital Controller for Isolated Power Supply Applications
• Manufacturer: Analog Devices

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
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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.
Output voltage sense and feedback
Digital loop filter compensation
PWM generation
Current sharing
Current, voltage, and temperature sense
OrFET control
Housekeeping and I
Calibration and trimming
OUTAUX
VCORE
AGND
OUTA
OUTB
OUTC
OUTD
VDD
RES
CS1
SR1
SR2
2
C interface
ENGINE
UVLO
PWM
LDO
VREF
ADC
FUNCTIONAL BLOCK DIAGRAM
OSC
ADD
ADC
Rev. 0 | Page 4 of 72
ADC
RTD
Figure 2.
DIGITAL
CORE
INTERFACE
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
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
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.
EEPROM
ADC
8kB
I
2
C
ADC
ADC
PWM
VS3+
VS3–
SHAREo
SHAREi
PGOOD1
PGOOD2
FLAGIN
DGND
PSON
SCL
SDA
2
C bus interface.
2
C bus inter-