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參數資料
| 型號： | PD70201ILQ-TR |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, PLASTIC, QFN-32 |
| 文件頁數： | 1/19頁 |
| 文件大小： | 416K |
| 代理商： | PD70201ILQ-TR |
PD70101 & PD70201
PRELIMINARY DATA SHEET
Copyright 2010
Microsemi
Page 1
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
G E N E R A L D E S C R I P T I O N
The
PD70101
and
PD70201
are
integrated Powered Device Interface and
PWM controllers for a DC-DC converter
used in IEEE802.3af and IEEE802.3at
applications. The PD70101 can be used
for IEEE802.3af or IEEE802.3at Type 1
applications, while the PD70201 can also
be
used
in
IEEE802.3at
Type
2
applications.
A single PD70201 can be used in 4-pair
applications
which
consumes
up
to
47.7W.
These devices have a number of features
designed
to
improve
efficiency
and
reliability:
Detection and Classification: The front
end
interface
includes
detection
and
classification
circuitry.
The
detection
signature resistor is disconnected upon
completion of the detection phase. The
system
then
begins
the classification
phase. Classification can be configured for
Classes 0 to 4 via an external resistor.
The
PD70201
includes
a
two-events
classification identification circuit which
generates
a
flag
to
inform
the
PD
application whether the Power Source
Equipment (PSE) is Type 1 or Type 2.
Capacitor:
A
current
limited
internal
MOSFET
switch
charges
the
input
capacitor of the DC-DC converter.
This
capacitor is discharged in a timely manner
when the input power is removed.
10V gate drivers: The PWM DC-DC
controller has two built-in 10V gate drivers
targeted for flyback direct buck or forward
converter with secondary synchronous
rectifier flyback.
The 10V gate drivers
lower external Power MOSFET power loss
while offering a wider MOSFET selection.
Peak current mode control: The DC-DC
converter employs peak current mode
control for better line and load step
response. The switching frequency can
be set from 100 kHz to 500 kHz, enabling
a size and efficiency trade off.
Maximum duty cycle is limited to
50% to reduce the power MOSFET
switch voltage to two times the input
voltage; a 150V rated MOSFET can
be used for the primary side switch.
The
secondary
synchronous
MOSFET voltage rating depends on
the output voltage and can be higher
or
lower
than
the
primary
side
MOSFET switch.
Soft-start
circuit:
The
devices
include a soft-start circuit to control
the output voltage rise time (user
settable) at start up, and to limit the
inrush
current.
An
integrated
start-up bias circuit powers the DC-
DC controller, until the device starts
up by the voltage generated by the
bootstrap circuit.
Low Voltage Protection Warning
and
Monitoring:
Dual
Under
Voltage Lock Out (UVLO), which
monitors both the PoE Port Input
Voltage and VCC, ensures reliable
operation
during
any
system
disturbances.
The PoE port UVLO
has a programmable threshold and
hysteresis to enable tailoring to the
desired turn on and turn off voltage.
Alternatively, the controller offers
Power Fail Warning (PFW) to alert
the host processor if PoE power
removal occurs.
An internal current sense amplifier
with a Kelvin connection allows the
use of an extremely low resistor to
measure the current sense threshold
voltage (100 mV) which optimizes
efficiency.
Low Power Mode operation is
provided to improve efficiency under
light loads such as when the PD is in
standby. The user can define at
what power level the unit enters low
power mode by means of a single
resistor value.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
K E Y F E A T U R E S
IEEE802.3af and
IEEE802.3at compliant
Support for 4-pair
applications of up to 47.7W
with a single IC
Two-events classification
identification with a Level
Signal indicating Type 1 or
Type 2 PSE
Less than 10 A (typ) offset
current during detection
Signature resistor is
disconnected upon detection
Programmable classification
setting with a single resistor
Integrated 0.6 Ohm isolating
MOSFET switch with inrush
current limit
Power Off DC-DC input
capacitor discharge
100 kHz to 500 kHz
adjustable DC-DC switching
frequency
DC-DC frequency can be
synchronized to external
clock
Supports low power mode
operation for higher efficiency
50% maximum duty cycle
Soft-start circuit to control the
output voltage rise time
Support efficient synchronous
rectification
PoE Port Input UVLO/PFW
with programmable threshold
and hysteresis
Internal differential amplifier
simplifying non-isolated step
down converter
Over load and short circuit
protection
RoHS compliant & Pb-Free
A P P L I C A T I O N S
IEEE802.3at and
IEEE802.3af powered
devices such as IP phones,
WLAN access points and
network cameras.
48 V input telcom/networks
hot swappable power supply
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