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ADP1043 Datasheet(PDF) 2 Page - Analog Devices

Part No. ADP1043
Description  Digital Controller for Isolated Power Supply Applications
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP1043 Datasheet(HTML) 2 Page - Analog Devices

   
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ADP1043
Preliminary Technical Data
Rev. PrA | Page 2 of 8
GENERAL DESCRIPTION
The ADP1043 is a secondary side controller for switch mode
power supplies (SMPS). It is designed for use in isolated redundant
applications. The ADP1043 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
OrFET control
Current, voltage, and temperature sense
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 patented multipath
approach. There is a combination of 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,
allowing easy programming of filter characteristics, which is of
great value in customizing and debugging designs. The PWM
block generates up to six 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 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 protection (UVP), ground continuity monitoring,
and ac sensing.
All these features are programmable through the I2C bus
interface. 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 digital bus
interface.
The internal 1024-byte EEPROM makes it possible to store all
programmed values and allows standalone control without a
microcontroller. Approximately 700 bytes of the EEPROM are
available for user information, such as version and manufactu-
ring date.
The ADP1043 comes with a free downloadable GUI, which
provides all the necessary software to program the part.
The ADP1043 operates from a single 3.3 V supply and is
specified from −40°C to +85°C.
RES
SHAREo
VS3–
VS3+
PGOOD1
VDD
OUTA
OUTB
SR1
SR2
OUTC
OUTD
CS1
PSON
SCL
SDA
VCORE
AGND
OUTAUX
PGOOD2
SHAREi
FLAGIN
ADP1043
RTD
ADD
DGND
ADC
ADC
ADC
ADC
ADC
ADC
UVLO
PWM
ENGINE
VREF
LDO
OSC
ADC
ADC
IREF
8kB EEPROM
DIGITAL
CORE
I2C
INTERFACE
PWM
Figure 2. Functional Block Diagram


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