Isolated Synchronous Flyback Controller with Integrated iCoupler Data Sheet ADP1071-1/ADP1071-2 FEATURES FUNCTIONAL BLOCK DIAGRAM Current mode controller for flyback topology FLYBACK SYNCHRONOUS INPUT OUTPUT TOPOLOGY RECTIFIER ADP1071-1: programmable LLM or CCM for high V IN applications BIAS ADP1071-2: forced CCM operation WINDING OPTIONAL Programmable slope compensation START-UP CIRCUITRY Integrated 5 kV isolation (wide body SOIC package) or 3.0 kV ADP1071-1/ ADP1071-2 (LGA package) rated dielectric isolation voltage with Analog Devices, Inc., patented iCoupler technology Wide voltage supply range Figure 1. Primary V : up to 60 V (ADP1071-2 only) DD Secondary V : up to 36 V DD2 GENERAL DESCRIPTION Integrated 1 A primary side MOSFET driver The ADP1071-1/ADP1071-2 are pulse-width modulation Integrated 1 A secondary side MOSFET drivers for (PWM) current mode fixed frequency synchronous flyback synchronous rectification controllers designed for isolated dc-to-dc power supplies. Integrated error amplifier and <1% accurate reference voltage Analog Devices proprietary iCouplers are integrated in the Programmable frequency range: 50 kHz to 600 kHz ADP1071-1/ADP1071-2 to eliminate the bulky signal trans- Duty cycle clamp limit 85% formers and optocouplers that transmit signals over the isolation Programmable soft start and soft start from precharged load boundary. Integrating the iCouplers reduces system design Protection features such as short circuit, output overvoltage, complexity, cost, and component count and improves overall and overtemperature protection system reliability. With the integrated isolators and metal-oxide Power saving LLM using MODE pin (ADP1071-1only) semiconductor field effect transistor (MOSFET) drivers on both Cycle by cycle input overcurrent protection the primary and the secondary side, the ADP1071-1/ADP1071-2 Precision enable UVLO with hysteresis offer a compact system level design and yield a higher efficiency Frequency synchronization than a diode rectified flyback converter at heavy loads. Safety and regulatory approvals (pending) Output regulation is achieved by sensing the output voltage on UL recognition the secondary side, where the feedback and the PWM signals 5000 V rms for 1 minute per UL 1577 (for wide body are transmitted between the primary and secondary sides SOIC package) through the iCouplers. 3000 V rms for 1 minute per UL 1577 (for LGA package) CSA Component Acceptance Notice 5A The ADP1071-1/ADP1071-2 are offered in a 16-lead SOIC W VDE certificate of conformity package with an isolation voltage rating of 5 kV rms. The DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 ADP1071-2 is designed for isolated dc-to-dc applications V = 849 V peak (for wide body SOIC package) IORM typically with an input voltage less than 36 V, and the V = 565 V peak (for LGA package) IORM ADP1071-1 targets high input voltage applications, in which the CQC certification per GB4943.1-2011 dc input voltage can exceed 60 V. Available in 16-lead SOIC W package and 24 terminal LGA The ADP1071-1/ADP1071-2 offer features such as input package current protection, output overvoltage protection (OVP), APPLICATIONS undervoltage lockout (UVLO), precision enable with adjustable hysteresis, overtemperature protection (OTP), and power Isolated dc-to-dc or ac-to-dc power conversion saving light load mode (LLM). Telecom, industrial Small cell PoE powered device Enterprise switches and routers Rev. B 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20182019 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 15626-001ADP1071-1/ADP1071-2 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Temperature Sensing ................................................................. 19 Applications ....................................................................................... 1 Frequency Setting (RT Pin) ...................................................... 19 Functional Block Diagram .............................................................. 1 Maximum Duty Cycle ............................................................... 19 General Description ......................................................................... 1 Frequency Synchronization ...................................................... 19 Revision History ............................................................................... 2 Synchronous Rectifier (SR) Driver .......................................... 20 Specif icat ions ..................................................................................... 3 Output Overvoltage Protection (OVP) ................................... 20 Insulation and Safety Related Specifications ............................ 6 SR Dead Time ............................................................................. 20 Regulatory Information ............................................................... 7 Light Load Mode (LLM) and Continuous Conduction Mode (CCM) .......................................................................................... 20 Absolute Maximum Ratings ............................................................ 8 Soft Stop ....................................................................................... 21 Thermal Resistance ...................................................................... 8 OCP/Feedback Recovery .......................................................... 21 ESD Caution .................................................................................. 8 Output Voltage Tracking ........................................................... 21 Pin Configurations and Function Descriptions ........................... 9 Remote System Reset ................................................................. 21 Typical Performance Characteristics ........................................... 12 OCP Counter .............................................................................. 22 Theory of Operation ...................................................................... 14 External Start-Up Circuit .......................................................... 23 Detailed Block Diagram ............................................................ 15 Insulation Lifetime ..................................................................... 23 Primary Side Supply, Input Voltage, and LDO ........................... 16 Layout Guidelines....................................................................... 24 Secondary Side Supply and LDO ............................................. 16 Applications Information .............................................................. 25 Precision Enable ......................................................................... 16 Typical Application Circuits ..................................................... 25 Soft Start Procedure ................................................................... 17 Outline Dimensions ....................................................................... 26 Output Voltage Sensing and Feedback .................................... 18 Ordering Guide .......................................................................... 27 Loop Compensation and Steady State Operation .................. 18 Slope Compensation .................................................................. 18 Input/Output Current-Limit Protection ..................................... 18 REVISION HISTORY 4/2019Rev. A to Rev. B Added 44-Terminal LGA Section ..................................... Universal Changes to Features Section............................................................ 1 Changes to Table 2 ............................................................................ 6 Change to Regulatory Information Section .................................. 7 Added Table 3 Title and Table 4 Renumbered Sequentially ........... 7 Changes to Table 6 and Table 7 ....................................................... 8 Added Table 8 .................................................................................... 8 Change to Figure 2 Caption, Figure 3 Caption, and Table 9 Title ....................................................................................... 9 Added Figure 4 Renumbered Sequentially, Figure 5, and Table 10 ............................................................................................ 10 Changes to Insulation Lifetime Section ....................................... 23 Updated Outline Dimensions ....................................................... 26 Changes to Ordering Guide .......................................................... 27 11/2018Rev. 0 to Rev. A Changes to Frequency Setting (RT Pin) Section ........................ 17 9/2018Revision 0: Initial Version Rev. B Page 2 of 27