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ADM1177 Folha de dados(PDF) 1 Page - Analog Devices |
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ADM1177 Folha de dados(HTML) 1 Page - Analog Devices |
1 / 24 page Hot Swap Controller and Digital Power Monitor with Soft Start Pin Data Sheet ADM1177 Rev. C Document Feedback 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 ©2006–2012 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Allows safe board insertion and removal from a live backplane Controls supply voltages from 3.15 V to 16.5 V Precision current sense amplifier Precision voltage input 12-bit ADC for current and voltage readback Charge pumped gate drive for external N-channel FET Adjustable analog current limit with circuit breaker ±3% accurate hot swap current limit level Fast response limits peak fault current Automatic retry or latch-off on current fault Programmable hot swap timing via TIMER pin Soft start pin for reference adjustment and programming of initial current ramp rate Active high ON pin I2C fast mode-compliant interface (400 kHz maximum) 10-lead MSOP APPLICATIONS Power monitoring/power budgeting Central office equipment Telecommunications and data communications equipment PCs/servers GENERAL DESCRIPTION The ADM1177 is an integrated hot swap controller that offers digital current and voltage monitoring via an on-chip, 12-bit analog-to-digital converter (ADC), communicated through an I2C® interface. An internal current sense amplifier measures voltage across the sense resistor in the power path via the VCC pin and the SENSE pin. The ADM1177 limits the current through this resistor by controlling the gate voltage (via the GATE pin) of an external N-channel FET in the power path. The voltage across the sense resistor (and, therefore, the inrush current) is kept below a preset maximum. The ADM1177 protects the external FET by limiting the time that the maximum current runs through it. This current limit period is set by the value of the capacitor attached to the TIMER pin. Additionally, the device provides protection from overcurrent events that may occur once the hot swap event is complete. In the case of a short-circuit event, the current in the sense resistor exceeds an overcurrent trip threshold, and the FET is switched off immediately by pulling down the GATE pin. FUNCTIONAL BLOCK DIAGRAM V I 0 1 ADM1177 SENSE ON VCC 1.3V MUX I2C 12-BIT ADC FET DRIVE CONTROLLER GND CURRENT SENSE AMPLIFIER UV COMPARATOR A SDA SCL ADR GATE TIMER SS Figure 1. RSENSE N-CHANNEL FET P = VI CONTROLLER ADM1177 SENSE VCC SDA SCL SDA SCL GND GATE ADR TIMER SS 3.15V TO 16.5V ON Figure 2. Applications Diagram A soft start pin (SS) is also included. This gives the user control over the reference on the current sense amplifier. An internal current source charges a capacitor on this pin at startup, allowing the user to set the profile of the initial current ramp. A voltage can also be driven on this pin to alter the reference. A 12-bit ADC can measure the current seen in the sense resistor, as well as the supply voltage on the VCC pin. An industry-standard I2C interface allows a controller to read current and voltage data from the ADC. Measurements can be initiated by an I2C command. Alternatively, the ADC can run continuously, and the user can read the latest conversion data whenever it is required. Up to four unique I2C addresses can be created, depending on how the ADR pin is connected. The ADM1177 is packaged in a 10-lead MSOP. |
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Descrição semelhante - ADM1177_15 |
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