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AS1860 Datasheet(PDF) 2 Page - List of Unclassifed Manufacturers |
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2 / 51 page AS1860 Akros Silicon, Inc. 6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA 408.746.9000 http://www.AkrosSilicon.com 2 TABLE OF CONTENTS GENERAL DESCRIPTION...........................................................................................................................................................1 TYPICAL APPLICATIONS ...........................................................................................................................................................1 SIMPLIFIED APPLICATION DIAGRAM .......................................................................................................................................1 FEATURES ..................................................................................................................................................................................1 POE PD CONTROLLER ..............................................................................................................................................................1 PRIMARY-SIDE DC-DC CONTROLLER......................................................................................................................................1 SECONDARY-SIDE POWER OUTPUTS.....................................................................................................................................1 POWER MANAGEMENT .............................................................................................................................................................1 EMC COMPLIANCE AND PROTECTION....................................................................................................................................1 FIGURES .....................................................................................................................................................................................4 TABLES........................................................................................................................................................................................5 PIN ASSIGNMENTS AND DESCRIPTIONS ................................................................................................................................6 TEST SPECIFICATIONS ...........................................................................................................................................................11 TYPICAL PERFORMANCE CHARACTERISTICS .....................................................................................................................18 FUNCTIONAL DESCRIPTION ...................................................................................................................................................19 ISOLATION ................................................................................................................................................................................19 PD CONTROLLER .....................................................................................................................................................................20 PD POWER MOSFET ................................................................................................................................................................20 UNDER-VOLTAGE LOCKOUT (UVLO) .....................................................................................................................................20 POE CURRENT LIMIT/CURRENT SENSE................................................................................................................................20 OVER-TEMPERATURE PROTECTION.....................................................................................................................................20 PD OPERATING STATES .........................................................................................................................................................20 AT DETECTION OPERATION ...................................................................................................................................................21 LOCAL POWER SOURCE .........................................................................................................................................................21 PWM CLOCK GENERATION.....................................................................................................................................................22 PWM CLOCK FREQUENCY CONFIGURATION .......................................................................................................................22 EXTERNAL CLOCK SOURCE (CLK_IN) ...................................................................................................................................22 EMI PERFORMANCE CONTROL..............................................................................................................................................22 POWER OUTPUT #1 .................................................................................................................................................................23 PRIMARY-SIDE DC-DC CONTROLLER....................................................................................................................................23 SOFT-START INRUSH CURRENT LIMIT..................................................................................................................................24 CURRENT-LIMIT AND CURRENT SENSE................................................................................................................................24 SECONDARY-SIDE SYNC CONTROLLER ...............................................................................................................................24 COMPENSATION AND LOOP FEEDBACK...............................................................................................................................24 LOW-LOAD CURRENT OPERATION - DCM.............................................................................................................................24 OVER-VOLTAGE PROTECTION...............................................................................................................................................24 POWER OUTPUTS #2 AND #3 .................................................................................................................................................24 LOOP FEEDBACK AND COMPENSATION...............................................................................................................................25 CURRENT-LIMIT AND CURRENT SENSE................................................................................................................................25 OVER-VOLTAGE PROTECTION...............................................................................................................................................25 POWER OUTPUT #4 .................................................................................................................................................................25 COMPENSATION AND LOOP FEEDBACK...............................................................................................................................26 CURRENT-LIMIT AND CURRENT SENSE................................................................................................................................27 OVER-VOLTAGE PROTECTION...............................................................................................................................................27 HARDWARE MODE OPERATION.............................................................................................................................................27 DEVICE INITIALIZATION & HARDWARE MODE SELECTION.................................................................................................27 HW MODE POWER OUTPUT CONTROLS...............................................................................................................................27 HW MODE POWER OUTPUT SEQUENCING...........................................................................................................................27 HW MODE POWER MONITORING (PGOOD) ..........................................................................................................................28 HW MODE WATCHDOG TIMER ...............................................................................................................................................28 WATCHDOG CONFIGURATION ...............................................................................................................................................28 WATCHDOG SERVICE .............................................................................................................................................................28 WATCHDOG TIMEOUT .............................................................................................................................................................28 HW MODE GENERAL-PURPOSE I/O OPERATION .................................................................................................................28 SOFTWARE MODE OPERATION .............................................................................................................................................28 DEVICE INITIALIZATION AND SOFTWARE MODE SELECTION ............................................................................................28 SW MODE POWER OUTPUT CONTROLS...............................................................................................................................29 SW MODE POWER OUTPUT SEQUENCING...........................................................................................................................29 |
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