Switching Regulator. ADuM4471 Datasheet

ADuM4471 Regulator. Datasheet pdf. Equivalent

ADuM4471 Datasheet
Recommendation ADuM4471 Datasheet
Part ADuM4471
Description Isolated Switching Regulator
Feature ADuM4471; Isolated Switching Regulator with Quad-Channel Isolators Data Sheet ADuM4470/ADuM4471/ADuM4472/ADuM4.
Manufacture Analog Devices
Datasheet
Download ADuM4471 Datasheet




Analog Devices ADuM4471
Isolated Switching Regulator
with Quad-Channel Isolators
Data Sheet ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474
FEATURES
Isolated PWM feedback with built in compensation
Primary side transformer driver for up to 2.5 W output power
with 5 V input voltage
Regulated adjustable output: 3.3 V to 24 V
Up to 80% efficiency
Quad dc-to-25 Mbps (NRZ) signal isolation channels
200 kHz to 1 MHz adjustable oscillator
Soft start function at power-up
Pulse-by-pulse overcurrent protection
Thermal shutdown
5000 V rms isolation
High common-mode transient immunity: >25 kV/μs
20-lead SOIC package with 8.3 mm creepage
High temperature operation: 105°C
APPLICATIONS
Power supply start-up bias and gate drives
Isolated sensor interfaces
Process controls
RS-232/RS-422/RS-485 transceivers
VDD1
VDDA
I/OA
I/OB
I/OC
I/OD
FUNCTIONAL BLOCK DIAGRAM
RECT
VISO
VREG
ADuM4470/
ADuM4471/
ADuM4472/
ADuM4473/
ADuM4474
PRIMARY
REG
CONTROLLER/
DRIVER
SECONDARY
CONTROLLER
INTERNAL
FEEDBACK
VDD2
5V
FB
OC
PRIMARY
DATA I/O
4-CHANNEL
GND1
CHA
CHB
CHC
SECONDARY
DATA I/O
4-CHANNEL
CHD
GND2
I/OA
I/OB
I/OC
I/OD
Figure 1.
GENERAL DESCRIPTION
The ADuM4470/ADuM4471/ADuM4472/ADuM4473/
ADuM44741 are quad-channel, digital isolators with a regu-
lated dc-to-dc isolated power supply controller and an internal
MOSFET driver. The dc-to-dc controller has an internal isolated
PWM feedback from the secondary side, based on the
iCoupler® chip scale transformer technology and complete loop
compensation. This eliminates the need to use an optocoupler
for feedback and compensates the loop for stability.
The ADuM447x isolators provide a more stable output voltage
and higher efficiency compared to unregulated isolated dc-
to-dc power supplies. The fully integrated feedback and loop
compensation in a wide-body SOIC package provide a smaller
form factor and 8.3 mm creepage distance solution.
The regulated feedback provides a relatively flat efficiency curve
over the full output power range. The ADuM447x enable a dc-
to-dc converter with a 3.3 V to 24 V isolated output voltage
range from either a 5.0 V or a 3.3 V input voltage, with an
output power of up to 2.5 W.
The ADuM447x isolators provide four independent isolation
channels in a variety of channel configurations and data rates.
(The x in ADuM447x throughout this data sheet stands for the
ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474.)
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7075 329 B2. Other patents pending.
Rev. 0
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Analog Devices ADuM4471
ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Block Diagrams of I/O Channels.................................................... 3
Specifications..................................................................................... 4
Electrical Characteristics—5 V Primary Input Supply/
5 V Secondary Isolated Supply ................................................... 4
Electrical Characteristics—3.3 V Primary Input Supply/
3.3 V Secondary Isolated Supply ................................................ 6
Electrical Characteristics—5 V Primary Input Supply/
3.3 V Secondary Isolated Supply ................................................ 8
Electrical Characteristics—5 V Primary Input Supply/
15 V Secondary Isolated Supply ............................................... 10
Package Characteristics ............................................................. 12
Regulatory Approvals (Pending) .............................................. 12
Insulation and Safety-Related Specifications.......................... 12
DIN V VDE V 0884-10 (VDE V 0884-10) Insulation
Characteristics ............................................................................ 13
Recommended Operating Conditions .................................... 13
Absolute Maximum Ratings.......................................................... 14
ESD Caution................................................................................ 14
Pin Configurations and Function Descriptions ......................... 15
Typical Performance Characteristics ........................................... 20
Applications Information .............................................................. 26
Theory of Operation .................................................................. 26
Application Schematics ............................................................. 26
Transformer Design ................................................................... 27
Transformer Turns Ratio........................................................... 27
Transformer ET Constant ......................................................... 27
Transformer Primary Inductance and Resistance ................. 28
Transformer Isolation Voltage .................................................. 28
Switching Frequency.................................................................. 28
Transient Response .................................................................... 28
Component Selection ................................................................ 29
Printed Circuit Board (PCB) Layout ....................................... 29
Thermal Analysis ....................................................................... 30
Propagation Delay-Related Parameters................................... 30
DC Correctness and Magnetic Field Immunity........................... 30
Power Consumption .................................................................. 31
Power Considerations................................................................ 32
Insulation Lifetime ..................................................................... 33
Outline Dimensions ....................................................................... 34
Ordering Guide .......................................................................... 34
REVISION HISTORY
12/12—Revision 0: Initial Version
Rev. 0 | Page 2 of 36



Analog Devices ADuM4471
Data Sheet
ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474
BLOCK DIAGRAMS OF I/O CHANNELS
ADuM4470
ADuM4473
Figure 2. ADuM4470
ADuM4471
Figure 5. ADuM4473
ADuM4474
Figure 3. ADuM4471
ADuM4472
Figure 6. ADuM4474
Figure 4. ADuM4472
Rev. 0 | Page 3 of 36







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