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ADP1043A Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADP1043A
Beschreibung Digital Controller
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 70 Seiten
ADP1043A Datasheet, Funktion
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
I2C interface
Extensive fault detection and protection
Extensive programming
Fast calibration
EEPROM
Standalone or microcontroller control
APPLICATIONS
AC-to-DC power supplies
Isolated dc-to-dc power supplies
Redundant power supplies
Parallel power supplies
Server, storage, network, and communications infrastructure
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 I2C 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.
PFC
www.DataSheet4U.com
AC
INPUT
DRIVER
TYPICAL APPLICATION CIRCUIT
ADuM1410
DRIVER
DRIVER
SR1 SR2 ACSNS
CS1
PGND CS2– CS2+
VS1 GATE VS2
VS3+
OUTA
OUTB
OUTC
OUTD
OUTAUX
RES ADD RTD VCORE FLAGIN PSON PGOOD2 PGOOD1 SDA SCL
VS3–
SHAREo
SHAREi
VDD DGND AGND
VDD
Figure 1.
MICROCONTROLLER
LOAD
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved.






ADP1043A Datasheet, Funktion
ADP1043A
Parameter
CURRENT SENSE 1 (CS1 PIN)
Input Voltage Range
Sampling Frequency
Current Sense Measurement
Accuracy
Symbol Test Conditions/Comments
VIN
fSAMP
From 10% to 90% of input voltage range
From 0% to 100% of input voltage range
Current Sense Measurement
Resolution
CS1 Fast OCP Threshold
CS1 Fast OCP Speed
CS1 Accurate OCP DC Accuracy
From 10% to 90% of input voltage range
CS1 Accurate OCP Speed
Leakage Current
CURRENT SENSE 2 (CS2+, CS2−
PINS)
Input Voltage Range
ADC Input Voltage Range
Sampling Frequency
Current Sense Measurement
Accuracy
VIN
fSAMP
Differential voltage from CS2+ to CS2−
LSB = 61.04 μV
From 0 mV to 200 mV
From 200 mV to 225 mV
Current Sense Measurement
Resolution
CS2 Accurate OCP Accuracy
From 0 mV to 200 mV
From 200 mV to 225 mV
CS2 Accurate OCP Speed
Current Sink (High Side)
wwwC.DuarrtaeSntheSeotu4rUce.c(oLmow Side)
Common-Mode Voltage at the
CS2+ and CS2− Pins
GATE PIN (OPEN DRAIN)
Output Low Voltage
OrFET PROTECTION (CS2+, CS2−)
Accurate OrFET Threshold
Accuracy
Accurate OrFET Speed
Fast OrFET Accuracy
VOL
Fast OrFET Speed
RTD PIN
Input Voltage Range
Current Source
RTD ADC Measurement
Accuracy
VIN
To achieve CS2 measurement accuracy
Low-side current sensing only
−25 mV setting
−50 mV setting
−75 mV setting
−100 mV setting
Debounce = 40 ns
RTD resistor = 100 kΩ
From 2% to 20% of input voltage range
From 32 mV to 320 mV
From 0% to 100% of input voltage range
From 0 V to 1.55 V
Rev. 0 | Page 6 of 72
Min
0
−3.0
−41.4
−10
−138
1.1
−3.0
−41.4
−100
0
−4
−15
−7.5
−4
−15
−7.5
0.8
−1.2
−40
−70
−100
−125
0
9.5
−1
−15.5
−10
−155
Typ Max Unit
1 1.38 V
100 Hz
+3.0 % FSR
+41.4 mV
+10 % FSR
+138 mV
12 Bits
1.2 1.3 V
80 100 ns
+3.0 % FSR
+41.4 mV
10 ms
4.0 μA
+225 mV
225 mV
100 Hz
+4 mV
+15 mV
+7.5 % FSR
12 Bits
+4 mV
+15 mV
+7.5 % FSR
10 ms
100 μA
100 μA
1 1.3 V
0
10
−25
−50
−75
−100
110
1
10.8
0.4 V
+1 mV
ms
−10 mV
−30 mV
−50 mV
−75 mV
150 ns
1.55
12
+1
+15.5
+10
+155
V
μA
% FSR
mV
% FSR
mV

6 Page









ADP1043A pdf, datenblatt
ADP1043A
THEORY OF OPERATION
CURRENT SENSE
The ADP1043A has two individual current sense inputs: CS1
and CS2±. These inputs sense, protect, and control the output
current and the share bus information. They can be calibrated
to remove any errors due to external components.
CS1 Operation (CS1)
CS1 is typically used for the monitoring and protection of the
primary side current. This is commonly known as the current
transformer (CT) method of current sensing. The input signal
at the CS1 pin is fed into an ADC for current monitoring. The
range of the ADC is 0 V to 1.38 V. The input signal is also fed
into a comparator for fast OCP protection. The typical config-
uration for the current sense is shown in Figure 10.
VIN
OUTA OUTC
OUTB OUTD
I = 10A
1V CS1
1k10I = 100mA
1:100
VREF
ADC 12 BITS
FAST
OCP
Figure 10. Current Sense 1 (CS1) Operation
The comparator effectively measures peak current, and the
wwAwD.DCaetaffSehcetievte4lUy.mcoemasures the average current information.
This information is available through the I2C interface. Various
thresholds and limits can be set for CS1, such as OCP. These
thresholds and limits are described in the Current Sense and
Current Limit Registers section.
CS2 Operation (CS2+, CS2−)
CS2± is used for the monitoring and protection of the secondary
side current. The full-scale range of the CS2 ADC is 225 mV. The
nominal full load voltage drop can be configured for 37.5 mV,
75 mV, or 150 mV. The differential inputs are fed into an ADC
through a pair of external resistors. When using low-side current
sensing, a 10 kΩ resistor is required. When using high-side current
sensing, a 110 kΩ resistor is required (for a 12 V application).
Low-side current sensing is recommended because it provides
improved performance compared with high-side current sensing.
High-side current sensing is not supported for applications
where the output voltage is above 20 V common mode. (There
is not enough offset trim range above 20 V common mode.)
Typical configurations are shown in Figure 11 and Figure 12.
Various thresholds and limits can be set for CS2, such as OCP.
These thresholds and limits are described in the Current Sense
and Current Limit Registers section.
When not in use, both CS2 inputs should be connected through
10 kΩ resistors to PGND.
I 12V
110k
CS2+
110k
CS2–
1V
100µA
100µA
ADC 12 BITS
Figure 11. High-Side Resistive Current Sense
I
10k
CS2–
10k
CS2+
1V
100µA
100µA
ADC 12 BITS
Figure 12. Low-Side Resistive Current Sense (Recommended)
Rev. 0 | Page 12 of 72

12 Page





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