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ADP1071-1 Datasheet(Fiches technique) 1 Page - Analog Devices

Numéro de pièce ADP1071-1
Description  Isolated Synchronous Flyback Controller
Télécharger  27 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
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Isolated Synchronous Flyback Controller
with Integrated iCoupler
Data Sheet
ADP1071-1/ADP1071-2
Rev. B
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Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
©2018–2019 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
Current mode controller for flyback topology
ADP1071-1: programmable LLM or CCM for high VIN
applications
ADP1071-2: forced CCM operation
Programmable slope compensation
Integrated 5 kV isolation (wide body SOIC package) or 3.0 kV
(LGA package) rated dielectric isolation voltage with
Analog Devices, Inc., patented iCoupler technology
Wide voltage supply range
Primary VDD: up to 60 V (ADP1071-2 only)
Secondary VDD2: up to 36 V
Integrated 1 A primary side MOSFET driver
Integrated 1 A secondary side MOSFET drivers for
synchronous rectification
Integrated error amplifier and <1% accurate reference voltage
Programmable frequency range: 50 kHz to 600 kHz
Duty cycle clamp limit 85%
Programmable soft start and soft start from precharged load
Protection features such as short circuit, output overvoltage,
and overtemperature protection
Power saving LLM using MODE pin (ADP1071-1only)
Cycle by cycle input overcurrent protection
Precision enable UVLO with hysteresis
Frequency synchronization
Safety and regulatory approvals (pending)
UL recognition
5000 V rms for 1 minute per UL 1577 (for wide body
SOIC package)
3000 V rms for 1 minute per UL 1577 (for LGA package)
CSA Component Acceptance Notice 5A
VDE certificate of conformity
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
VIORM = 849 V peak (for wide body SOIC package)
VIORM = 565 V peak (for LGA package)
CQC certification per GB4943.1-2011
Available in 16-lead SOIC_W package and 24 terminal LGA
package
APPLICATIONS
Isolated dc-to-dc or ac-to-dc power conversion
Telecom, industrial
Small cell
PoE powered device
Enterprise switches and routers
FUNCTIONAL BLOCK DIAGRAM
FLYBACK
TOPOLOGY
BIAS
WINDING
OUTPUT
INPUT
SYNCHRONOUS
RECTIFIER
OPTIONAL
START-UP
CIRCUITRY
ADP1071-1/
ADP1071-2
Figure 1.
GENERAL DESCRIPTION
The ADP1071-1/ADP1071-2 are pulse-width modulation
(PWM) current mode fixed frequency synchronous flyback
controllers designed for isolated dc-to-dc power supplies.
Analog Devices proprietary iCouplers® are integrated in the
ADP1071-1/ADP1071-2 to eliminate the bulky signal trans-
formers and optocouplers that transmit signals over the isolation
boundary. Integrating the iCouplers reduces system design
complexity, cost, and component count and improves overall
system reliability. With the integrated isolators and metal-oxide
semiconductor field effect transistor (MOSFET) drivers on both
the primary and the secondary side, the ADP1071-1/ADP1071-2
offer a compact system level design and yield a higher efficiency
than a diode rectified flyback converter at heavy loads.
Output regulation is achieved by sensing the output voltage on
the secondary side, where the feedback and the PWM signals
are transmitted between the primary and secondary sides
through the iCouplers.
The ADP1071-1/ADP1071-2 are offered in a 16-lead SOIC_W
package with an isolation voltage rating of 5 kV rms. The
ADP1071-2 is designed for isolated dc-to-dc applications
typically with an input voltage less than 36 V, and the
ADP1071-1 targets high input voltage applications, in which the
dc input voltage can exceed 60 V.
The ADP1071-1/ADP1071-2 offer features such as input
current protection, output overvoltage protection (OVP),
undervoltage lockout (UVLO), precision enable with adjustable
hysteresis, overtemperature protection (OTP), and power
saving light load mode (LLM).




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