Preliminary Datasheet ADP1074 (Analog Devices)

Isolated Synchronous Forward Controller with Active Clamp and
i
Coupler Preliminary Technical Data ADP1074 FEATURES GENERAL DESCRIPTION Current Mode Controller for active clamp forward topology
The ADP10741 is a current mode fixed frequency active-clamp
Integrated 5 kV isolation with Analog Devices i Coupler
synchronous forward controller designed for isolated DC-to-
technology
DC power supplies. Analog Devices, Inc., proprietary iCoupler®
Wide voltage supply range
devices are integrated in the ADP1074 to eliminate the bulky
Primary V : Up to 60 V DD
signal transformers and opto-couplers that transmit signals over
Secondary V : Up to 36 V DD2
the isolation boundary. This reduces system design complexity,
Integrated 1A primary side MOSFET driver for power switch
cost, component count, and improves overall system reliability.
and active clamp reset switch
With the integrated isolators and MOSFET drivers on both the
Integrated 1A secondary side MOSFET driver for
primary and the secondary, the ADP1074 offers a compact
synchronous rectification
system level design and yields a higher efficiency than a non-
Integrated error amplifier and < 1% accurate reference
synchronous forward converter at heavy loads.
voltage
The primary side pins provide functions for programming the
Programmable slope compensation
switching frequency and maximum duty cycle, external
Programmable frequency range: 50 kHz – 600 kHz
frequency synchronization and slope compensation.
Frequency synchronization Programmable maximum duty cycle limit
The secondary side pins provide functions for differential
Programmable soft start
output voltage sensing, over voltage, power good, and
Smooth soft start from pre-charged load
programmable light load mode setting.
Programmable dead time
The feedback signal and timing of synchronous rectifier PWMs
Power saving light load mode using MODE pin
are transmitted between the primary and secondary or
Protection features such as short circuit,
secondary to primary through the iCouplers using a proprietary
output overvoltage, and over temperature protection
transmission scheme.
Cycle-by-cycle input overcurrent protection Precision enable UVLO with hysteresis
The ADP1074 also offers features such as input current
Power Good pin for system flagging
protection, under voltage lockout (UVLO), precision enable
Tracking function from secondary side
with adjustable hysteresis, and over temperature protection
Remote (secondary side) shutdown/reset function
(OTP) and light load power saving mode (LLM).
Available in 24-pin SOIC_W package APPLICATIONS Isolated DC/DC Power conversion Intermediate Bus Voltage Generation Telecom, Industrial Base station and Antenna RF power Small Cell PoE Powered Device Enterprise Switches/Routers Core/Edge/Metro/Optical Routing Power Modules
1 Protected by U.S. Patent US 7,075,329 B2.
Rev. PrB 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2017 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TABLE OF CONTENTS TYPICAL APPLICATION CIRCUITS SPECIFICATIONS REGULATORY INFORMATION ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SIMPLIFIED BLOCK DIAGRAM APPLICATIONS INFORMATION INSULATION LIFETIME OUTLINE DIMENSIONS