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PDF MP8001 Data sheet ( Hoja de datos )
| Número de pieza | MP8001 | |
| Descripción | 15W Power Over Ethernet PoE Powered Device (PD) Controller | |
| Fabricantes | MPS | |
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The Future of Analog IC Technology
DESCRIPTION
The MP8001 is an IEEE 802. 3 af POE
compliant Powered Device (PD) controller. It
includes detection and classification modes as
well as a 100V output pass device having a
temperature compensated current limit over the
specified temperature range. Thermal
protection is built in to accommodate both
transient and/or overload conditions, shutting
the part down and protecting the input source
as well as the output load depending on the
particular fault conditions. Inrush current limiting
is included to slowly charge the input capacitor
without interruption due to die heating, a
problem encountered without the current limit
foldback feature.
EVALUATION BOARD REFERENCE
Board Number
EV8001DS-00A
Dimensions
2.8”x1.7”x0.8” ( LxWxH)
MP8001
15W Power Over Ethernet PoE
Powered Device (PD) Controller
FEATURES
Meets IEEE 802. 3 af Specifications
100V, 1Ω Integrate DMOS Device
460mA max, Current Limit
Open Drain Power Good Output
8 pin SOIC and TSSOP Packages
APPLICATIONS
VoIP Telephones
Network Cards
Security Camera Systems
Safety Backup Power
Remote Internet Power
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
ADAM (Analog Digital Adaptive Modulation) and AAM (Advanced
Asynchronous Mode) are trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP8001 Rev. 1.0
12/12/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
1
Free Datasheet http://www.datasheetlist.com/
1 page  
MP8001 – IEEE 802.3af PoE POWERED DEVICE CONTROLLER
PIN FUNCTIONS
Pin #
1
2
3
4
5
6
7
8
Name Description
ILIM Startup ILIM Value Set (optional at this point).
CLASS Classification Resistor.
DET 26.1kΩ Detection Resistor.
VSS Negative Power Supply Terminal.
RTN Powered Device Negative Power Terminal.
PG Power Good Indicator.
NC No Connect. Possible post-package trim input.
VDD Positive Power Supply Terminal.
OPERATION
The MP8001 operates in the manner described
here and in the IEEE 802.3af Powered Device
(PD) Specifications. This device (along with the
power sourcing element (PSE)) operates as a
safety device to supply potentially lethal
voltages only when the power sourcing element
recognizes a unique, tightly specified resistance
at the end of an unknown length of Ethernet
cable.
A 25kΩ resistance is presented as a load to the
PSE in Detection Mode, when the PSE applies
two “safe” voltages of less than 10.1V each
while measuring the change in current drawn in
order to determine the load resistance. If the
PSE “sees” the correct load, then it may either
further increase the applied voltage to enter the
“classification” range of operation or switch on
the nominal 48V power to the load.
The classification mode can further specify to
the PSE the expected load range of the device
under power so that the PSE can intelligently
distribute power to as many loads as possible
(within its maximum current capabilities). If a
classification resistance is not present, the PD
load is assumed to be the maximum of
approximately 13 Watts. The classification
mode is active between 14.5V and 20.5V.
The main power switch will pass a limited
current above 31V, charging the external
DC-to-DC converter’s input capacitor in a
controlled manner. The charging will continue
until the controlled current drops below the
either an externally programmed limiting level
or 450mA, depending upon the Rlim current
setting resistor. The main power switch is
internally thermally protected to 100V by
reducing the output current using a foldback
technique. The required power dissipation of
the IC drops from the allowed peak value of
26W (450mA x 57V) to 0.16W ((450mA)2 x RON)
during the normal operation at turn-on. The
minimum allowed capacitance of 5µF will
charge in 500µs. A larger capacitor will take a
proportionally longer time to charge due to the
constant current charging method. If a. A
capacitor that is too large will overheat the part
and force it into thermal shutdown. The IC will
reattempt charging for a number of cycles but
ultimately will be shut down until the input
voltage from the PSE is recycled. This is the
way the IC protects itself under overload and/or
shorted conditions.
MP8001 Rev. 1.0
12/12/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
5
Free Datasheet http://www.datasheetlist.com/
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MP8001.PDF ] | |
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