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AS1834 PDF даташит

Спецификация AS1834 изготовлена ​​​​«Akros Silicon» и имеет функцию, называемую «Digital Power PoE PD Controllers».

Детали детали

Номер произв AS1834
Описание Digital Power PoE PD Controllers
Производители Akros Silicon
логотип Akros Silicon логотип 

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AS1834 Даташит, Описание, Даташиты
AS1854/44/34/24 Digital Power PoE PD Controllers
with HV Isolation and Quad DC-DC Outputs
GENERAL DESCRIPTION
The AS18x4 product family integrates Akros GreenEdge™ Isolation
technology with next generation Power-over-Ethernet (PoE) PD and
power conversion technology to deliver groundbreaking power
integration, and enable a new range of Digital Power PoE PD
capabilities and solutions.
A Type 1 (IEEE® 802.3af) and Type 2 (IEEE® 802.3at) compliant PD
is integrated with high-voltage isolation and quad-output digital
power DC-DC converters – resulting in a complete PoE & Power
management solution in a single device with minimal external
components.
In addition to enabling digital PoE power conversion, Akros
GreenEdge™ isolation enables direct digital management of both
isolated Primary power and Secondary system power for real time
end-to-end Green Power application capabilities.
TYPICAL APPLICATIONS
Voice-over-IP (VoIP) phones
Wireless LAN & WiMAX access points (WAP)
Pan, Tilt, Zoom (PTZ) Cameras, IP cameras
Thin-client and notebook computers
Fiber-to-the-home (FTTH) terminals
Point-of-sale (PoS) terminals, RFID readers
ORDERING INFORMATION
The AS18x4 family includes four pin-compatible devices, all available
in 64-lead QFN Reduction of Hazardous Substance (RoHS)
compliant packages.
Part #
Type 1 Type 2 Hardware
PD PD Mode
AS1824*
x
x
AS1834*
x
x
AS1844*
x
x
x
AS1854*
x
x
x
* Industrial Temperature Range, -40°C to 85°C
Software
Mode
x
x
Pwr In
(W)
13
13
13/30
13/30
FEATURES
   PoE PD Controller 
Type 1 and Type 2 IEEE® 802.3af & 802.3at Compliant PD
Automatic PoE-Plus (Type 2) detection in HW and
I2C Modes
Low Resistance PD Power FET Switch (0.5typical)
PrimarySide DCDC Controller 
High-efficiency DC-DC Controller with Digital Optimization
Primary-Secondary High-voltage integrated Digital Isolation
Programmable Primary Clock Frequency
Local-power operation down to 9.5V
SecondarySide Power Outputs 
Programmable PWM Frequencies synched to External Clock
Output #1: Sync Controller with programmable power FET
timing for high efficiency at both light and full load
Outputs #2 & #3: Buck Regulators w/2A FETs
Output #4: DC-DC Controller for Buck, Boost, or LED Boost
platform applications
EMC Compliance and Protection
Slew-rate-controlled power drivers
Multi-phased PWM clocking, with External Sync clock option
Optional spread-spectrum clocking available for all PWMs
Over-current, Under/Over-voltage and Short-circuit Protection
High-temperature warning and shutdown
Meets IEC 61000-4-2/3/4/5/6, IEC60747, IEC 60950, DIN
EN60747-5-2 (VDE0884), & UL1577 requirements for EMC
compliance and basic isolation to 2120 VDC (1500 VRMS)
100V Process for PoE transient voltage robustness
SIMPLIFIED APPLICATION DIAGRAM
Akros Silicon, Inc.
6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA
408.746.9000 http://www.AkrosSilicon.com









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AS1834 Даташит, Описание, Даташиты
AS1854/44/34/24
TABLE OF CONTENTS
 
GENERAL DESCRIPTION...........................................................................................................................................................1
TYPICAL APPLICATIONS ...........................................................................................................................................................1
ORDERING INFORMATION........................................................................................................................................................1
FEATURES ..................................................................................................................................................................................1
POE PD CONTROLLER ..............................................................................................................................................................1
PRIMARY-SIDE DC-DC CONTROLLER .....................................................................................................................................1
SECONDARY-SIDE POWER OUTPUTS ....................................................................................................................................1
EMC COMPLIANCE AND PROTECTION....................................................................................................................................1
SIMPLIFIED APPLICATION DIAGRAM .......................................................................................................................................1
TABLE OF CONTENTS ...............................................................................................................................................................2
FIGURES .....................................................................................................................................................................................4
TABLES .......................................................................................................................................................................................4
PIN ASSIGNMENTS AND DESCRIPTIONS................................................................................................................................6
TEST SPECIFICATIONS ...........................................................................................................................................................12
TYPICAL PERFORMANCE CHARACTERISTICS.....................................................................................................................19
FUNCTIONAL DESCRIPTION ...................................................................................................................................................20
ISOLATION ................................................................................................................................................................................20
PD CONTROLLER.....................................................................................................................................................................21
PD POWER MOSFET................................................................................................................................................................21
UNDER-VOLTAGE LOCKOUT (UVLO) .....................................................................................................................................21
POE CURRENT LIMIT/CURRENT SENSE ...............................................................................................................................21
OVER-TEMPERATURE PROTECTION ....................................................................................................................................21
PD OPERATING STATES .........................................................................................................................................................22
CLASS .......................................................................................................................................................................................22
POWER (WATTS)......................................................................................................................................................................22
ICLASS ......................................................................................................................................................................................22
RCLASS ..................................................................................................................................................................................... 22
AT DETECTION OPERATION (AS1854/44 ONLY) ...................................................................................................................22
LOCAL POWER SOURCE.........................................................................................................................................................23
LDET MODE ..............................................................................................................................................................................23
AT_DET INDICATION................................................................................................................................................................23
PSE = TYPE 1............................................................................................................................................................................23
PSE = TYPE 2............................................................................................................................................................................23
LOCAL ADAPTOR OR LOCAL VOLTAGE REQUIREMENT.....................................................................................................23
TYPICAL LDET VOLTAGE RANGE TO COVER ADAPTOR(S)................................................................................................23
PWM CLOCK GENERATION ....................................................................................................................................................23
PWM CLOCK FREQUENCY CONFIGURATION.......................................................................................................................23
EXTERNAL CLOCK SOURCE (CLK_IN)...................................................................................................................................23
EMI PERFORMANCE CONTROL..............................................................................................................................................23
POWER OUTPUT #1 .................................................................................................................................................................24
PRIMARY-SIDE DC-DC CONTROLLER ...................................................................................................................................25
SOFT-START INRUSH CURRENT LIMIT .................................................................................................................................25
CURRENT-LIMIT AND CURRENT SENSE ...............................................................................................................................25
SECONDARY-SIDE SYNC CONTROLLER...............................................................................................................................25
SYNC DELAY ............................................................................................................................................................................25
OVERLAP DELAY (NS) .............................................................................................................................................................25
DELAY TIMING LIMIT................................................................................................................................................................25
DESIRED SYNC DELAY (NS) ..............................................................................................................................................26
DESIRED OVERLAP DELAY
(NS) ....................................................................................................................................26
DELAY TIMING LIMIT CHECK (NS) .........................................................................................................................................26
SYNC_DLY RESISTOR REQUIRED () ...................................................................................................................................26
SYNC_OVL RESISTOR REQUIRED () ...................................................................................................................................26
COMPENSATION AND LOOP FEEDBACK ..............................................................................................................................26
LOW-LOAD CURRENT OPERATION - DCM ............................................................................................................................26
Akros Silicon, Inc.
6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA
408.746.9000 http://www.AkrosSilicon.com
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AS1834 Даташит, Описание, Даташиты
AS1854/44/34/24
OVER-VOLTAGE PROTECTION ..............................................................................................................................................26
RF & EMI FILTERING ................................................................................................................................................................26
POWER OUTPUTS #2 AND #3 .................................................................................................................................................26
LOOP FEEDBACK AND COMPENSATION ..............................................................................................................................27
CURRENT-LIMIT AND CURRENT SENSE ...............................................................................................................................27
OVER-VOLTAGE PROTECTION ..............................................................................................................................................27
POWER OUTPUT #4 .................................................................................................................................................................27
COMPENSATION AND LOOP FEEDBACK ..............................................................................................................................28
CURRENT-LIMIT AND CURRENT SENSE ...............................................................................................................................29
OVER-VOLTAGE PROTECTION ..............................................................................................................................................29
HARDWARE MODE OPERATION.............................................................................................................................................29
DEVICE INITIALIZATION & HARDWARE MODE SELECTION ................................................................................................29
HW MODE POWER OUTPUT CONTROLS ..............................................................................................................................29
HW MODE POWER OUTPUT SEQUENCING ..........................................................................................................................29
HW MODE POWER MONITORING (PGOOD) ..........................................................................................................................30
HW MODE WATCHDOG TIMER ...............................................................................................................................................30
WATCHDOG CONFIGURATION ...............................................................................................................................................30
WATCHDOG SERVICE .............................................................................................................................................................30
WATCHDOG TIMEOUT.............................................................................................................................................................30
HW MODE GENERAL-PURPOSE I/O OPERATION .................................................................................................................30
SOFTWARE MODE OPERATION .............................................................................................................................................31
DEVICE INITIALIZATION AND SOFTWARE MODE SELECTION ............................................................................................31
SW MODE POWER OUTPUT CONTROLS...............................................................................................................................31
SW MODE POWER STATUS MONITORING (PGOOD) ...........................................................................................................31
HISTORY REGISTER ................................................................................................................................................................32
PD VOLTAGE AND CURRENT MEASUREMENTS ..................................................................................................................32
PD OVER-CURRENT ALARM THRESHOLD ............................................................................................................................32
SW MODE POWER MARGINING .............................................................................................................................................32
SW MODE EMI PERFORMANCE CONTROL ...........................................................................................................................32
PWM CLOCKS - PRBS RANDOMIZATION...............................................................................................................................32
PWM CLOCKS - FRACTIONAL-N .............................................................................................................................................32
SW MODE GENERAL-PURPOSE I/O & ADC ...........................................................................................................................32
GENERAL-PURPOSE I/O PINS ................................................................................................................................................33
GENERAL-PURPOSE ADC (ADCIN PIN) .................................................................................................................................33
SW MODE WATCHDOG TIMER OPERATION .........................................................................................................................33
WATCHDOG TIMER MODES....................................................................................................................................................33
WATCHDOG TIMER OPERATION............................................................................................................................................33
WATCHDOG ENABLE...............................................................................................................................................................33
SW MODE INTERRUPT OPERATION ......................................................................................................................................34
INTERRUPT MASKING .............................................................................................................................................................34
INTERRUPT STATUS................................................................................................................................................................34
I2C INTERFACE ........................................................................................................................................................................34
START/STOP TIMING ...............................................................................................................................................................34
DATA TIMING ............................................................................................................................................................................34
ACKNOWLEDGE (ACK) ............................................................................................................................................................34
DEVICE ADDRESS CONFIGURATION.....................................................................................................................................35
DEVICE ADDRESS/OPERATION WORD .................................................................................................................................36
REGISTER ADDRESS WORD ..................................................................................................................................................36
DATA WORD .............................................................................................................................................................................36
WRITE CYCLE...........................................................................................................................................................................36
READ CYCLE ............................................................................................................................................................................36
REGISTER DESCRIPTIONS .....................................................................................................................................................37
POWER OVER ETHERNET OVERVIEW ..................................................................................................................................46
POWER FEED ALTERNATIVES FOR 10/100/1000M ETHERNET SYSTEMS.........................................................................46
POE+: THE NEXT GENERATION .............................................................................................................................................47
POE POWER-ON SEQUENCE .................................................................................................................................................48
PACKAGE SPECIFICATIONS ...................................................................................................................................................50
CONTACT INFORMATION........................................................................................................................................................51
IMPORTANT NOTICES .............................................................................................................................................................51
Akros Silicon, Inc.
6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA
408.746.9000 http://www.AkrosSilicon.com
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