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参数资料
| 型号： | PD70201ILQ |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | 5 X 5 MM, ROHS COMPLIANT, PLASTIC, QFN-32 |
| 文件页数： | 6/19页 |
| 文件大小： | 416K |
| 代理商： | PD70201ILQ |
PD70101 & PD70201
PRELIMINARY DATA SHEET
Copyright 2010
Microsemi
Page 14
Rev. 0.6, 21-Jan-2011
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA 92841; 714-898-8121; Fax: 714-893-2570
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PD70101 / PD70201: IEEE 802.3 af/at
Power Over Ethernet PD Controller
TM
T H E O R Y O F O P E R A T I O N
DETAIL DESCRIPTION
PD70101/PD70201 IC integrates IEEE 802.3af/at
compliant PD Front-End functions including Detection,
Physical Layer Classification, Two-Events Classification
(PD70201 only), Power Good, Soft Start Current
Limiting, Over-Current Protection, and Bulk Capacitor
Discharge with a PWM controller. The integrated PWM
controller function provides a PWM controller solution
with a minimum requirement of external components.
DETECTION
IEEE 802.3af/at compliant detection is provided by
means of a 24.9KΩ resistor connected between VPP
and RDET pin. RDET pin is connected to VPN_IN via
an open drain MOSFET with a maximum specified
RDSON of 50Ω. Internal logic monitors VPP to VPN_IN
and connects the RDET pin to VPN_IN when the rising
VPP to VPN_IN voltage is between 1.1V and 10.1V.
When rising VPP to VPN_IN voltages exceed 10.1V,
the MOSFET is switched off. Once above 10.1V, falling
VPP to VPN_IN voltage between 2.45V and 4.85V will
reconnect RDET pin to VPN_IN.
PHYSICAL LAYER CLASSIFICATION
Physical Layer (hardware) Classification per IEEE
802.3af/at is generated via a regulated reference
voltage of 1.2V, switched onto the RCLASS pin.
Internal logic monitors the VPP to VPN_IN voltage and
connects the 1.2V reference to RCLASS pin at a rising
VPP to VPN_IN voltage threshold between 11.1V and
13.5V. Once VPP to VPN_IN as exceeded the rising
threshold, there is a 1V minimum hysteresis between
the VPP rising (turn-on) threshold and the VPP falling
(turn-off) threshold.
The 1.2V reference stays connected to the RCLASS
pin until the VPP to VPN_IN rising voltage exceeds the
upper turn-off threshold of 20.9V to 23.9V. The 1.2V
reference voltage is disconnected from the RCLASS pin
at VPP to VPN_IN voltages above the upper threshold.
Classification current signature is provided via a
resistor connected between RCLASS pin and VPN_IN.
The classification current is therefore the current drawn
by the PD70101/PD70201 IC during the classification
phase, and is simply the 1.2V reference voltage divided
by the RCLASS resistor value. The maximum current
available at the RCLASS pin is current limited to 55mA
(typical).
TWO-EVENTS DETECTION AND AT FLAG
The PD70201 IC provides IEEE 802.3at Type 2
compliant detection of the “Two Events Classification
Signature”, and generation of the AT flag. This feature
is available on the PD70201 IC only.
Simply
put,
the
“Two
Events
Classification
Signature” is a mean by which an IEEE 802.3at Type
2 Power Source can inform a compliant Power Device
(PD) that it is AT Type 2 compliant, and as such is
capable of providing AT Type 2 power levels.
The Power Source communicates with the Type 2
compliant signature by toggling the VPP to VPN_IN
voltage twice (2 “events”) during the Physical Layer
Classification phase. The VPP to VPN_IN voltage is
toggled
from
the
Physical
Layer
Classification’s
voltage level (13.5V to 20.9V) down to a voltage
“Mark” level.
Voltage “Mark” level is specified as a
VPP to VPN_IN voltage of 4.9V to 10.1V.
PD70201 IC recognizes a VPP to VPN_IN falling
edge from Classification level to Mark level as being
one event of the Two-Events Signature. If two such
falling edges are detected, PD70201 will assert AT
flag by means of an open drain MOSFET connected
between AT_FLAG pin and VPN_OUT.
AT_FLAG pin is active low; a low impedance state
between AT_FLAG and VPN_OUT indicates a valid
Two-Events Classification Signature was received,
and the Power Source is AT Type 2 compliant.
AT_FLAG MOSFET is capable of 5mA of current
and can be pulled up to VPP.
SOFT START AND INRUSH CURRENT PROTECTION
PD70101/PD70201 IC contains an internal isolation
switch, that provides ground isolation between Power
Source and PD application during Detection and
Classification phases.
The isolation switch is a N-
channel
MOSFET,
wired
in
a
common
source
configuration
where
the
MOSFET’s
Source
is
connected to Power Source ground at VPN_IN, and
the MOSFET’s Drain is connected to application’s
primary ground at VPN_OUT.
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