900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Analog Devices Semiconductor Electronic Components Datasheet

ADuM4474 Datasheet

Isolated Switching Regulator

No Preview Available !

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
Document Feedback
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
©2012 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

ADuM4474 Datasheet

Isolated Switching Regulator

No Preview Available !

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


Part Number ADuM4474
Description Isolated Switching Regulator
Maker Analog Devices
Total Page 30 Pages
PDF Download

ADuM4474 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 ADuM4470 Isolated Switching Regulator
Analog Devices
2 ADuM4471 Isolated Switching Regulator
Analog Devices
3 ADuM4472 Isolated Switching Regulator
Analog Devices
4 ADuM4473 Isolated Switching Regulator
Analog Devices
5 ADuM4474 Isolated Switching Regulator
Analog Devices





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy