ADM1041ARQZ Analog Devices

Secondary-Side Controller with Current Share and Housekeeping ADM1041 INTERFACE AND INTERNAL FEATURES PRODUCT FEATURES 2 SMBus interface (I C compatible) Digital calibration via internal EEPROM Low-drift precision 2.5 V reference Supports SSI specification Voltage error amplifier Comprehensive fault detection Differential current sense Reduced component count on secondary side Sense resistor or current transformer option Standalone or microcontroller control Overvoltage protection Undervoltage protection SECONDARY-SIDE FEATURES Overcurrent protection Generates error signal for primary-side PWM Overtemperature protection Output voltage adjustment and margining Start-up undervoltage blanking Current sharing Programmable digital debounce and delays Current limit adjustment 352-byte EEPROM available for field data OrFET control 160-byte EEPROM for calibration Programmable soft-start slew rate Ground continuity monitoring Standalone or microcontroller operation APPLICATIONS Differential load voltage sense Network servers AC mains undervoltage detection (ac sense) Web servers Overvoltage protection Power supply control OrFET RS V OUT R LOAD GND V DD V DD V DD PWM BIAS CONTROLLER SHARE BUS ADM1041 F V CBD G DD C /V F S LS D V OUT THERMISTOR C + SHRO S V DD SHRS V DD V V + V + S CMP S V ICT S V S PULSE AC OK DC OK OTP MON2 PSON PEN C ADD0 CMP V MICRO- DD SCMP SCL CONTROLLER GND SDA OPTIONAL ISOLATION BARRIER Figure 1. Typical Application Circuit Rev. A 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Specifications subject to change without notice. No license is granted by implication Tel: 781.329.4700 www.analog.com or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Fax: 781.326.8703 2004 Analog Devices, Inc. All rights reserved. 04521-0-031ADM1041 TABLE OF CONTENTS Specifications..................................................................................... 6 Pulse ............................................................................................. 27 Absolute Maximum Ratings.......................................................... 13 ACSENSE.......................................................................................... 27 ESD Caution................................................................................ 13 OrFET Gate Drive...................................................................... 28 Pin Configuration and Function Descriptions........................... 14 Oscillator and Timing Generators ............................................... 30 Terminology .................................................................................... 17 Logic I/O and Monitor Pins...................................................... 30 Theory of Operation ...................................................................... 19 SMBus Serial Port....................................................................... 33 Power Management.................................................................... 19 Microprocessor Support............................................................ 33 Gain Trimming and Configuration ......................................... 19 Broadcasting................................................................................ 34 Differential Remote Sense Amplifier............................................ 20 SMBus Serial Interface............................................................... 34 Set Load Voltage.......................................................................... 20 General SMBus Timing ............................................................. 34 Load Overvoltage (OV) ............................................................. 20 SMBus Protocols for RAM and EEPROM.............................. 36 Local Voltage Sense .................................................................... 20 SMBus Read Operations ........................................................... 38 Local OverVoltage Protection (OVP)...................................... 20 SMBus Alert Response Address (ARA)................................... 39 Local UnderVoltage Protection (UVP) ................................... 20 Support for SMBus 1.1............................................................... 39 False UV Clamp.......................................................................... 20 Layout Considerations............................................................... 39 Voltage Error Amplifier ............................................................. 21 Power-Up Auto-Configuration ................................................ 39 Main Voltage Reference ............................................................. 21 Extended SMBus Addressing.................................................... 40 Current Sense Amplifier............................................................ 21 Backdoor Access ......................................................................... 40 Current Sensing .......................................................................... 22 Register Listing ............................................................................... 41 Current Transformer Input ....................................................... 22 Detailed Register Descriptions ..................................................... 42 Current Sense Calibration......................................................... 22 Manufacturing Data................................................................... 51 Current Limit Error Amplifier.................................................. 22 Microprocessor Support................................................................ 52 Overcurrent Protection ............................................................. 22 Trim Table........................................................................................ 54 Current Share .................................................................................. 24 Appendix AConfiguration Table .............................................. 55 Current Share Offset .................................................................. 24 Appendix BTest Name Table..................................................... 61 ISHARE Drive Amplifier................................................................. 24 Outline Dimensions ....................................................................... 64 Differential Sense Amplifier...................................................... 24 Ordering Guide .......................................................................... 64 I Error Amplifier................................................................. 24 REVISION HISTORY SHARE 3/04-Revision Sp0: Initial Version I Clamp................................................................................. 24 SHARE 5/04-Changed from Rev. Sp0 to Rev. A Share ok Detector...................................................................... 24 U Pulse/AC 2................................................................................. 27 SENSE Upd Rev. A Page 2 of 64