ON NCP1092 Integrated ieee 802.3af poe-pd interface controller Datasheet

NCP1090, NCP1091,
NCP1092
Integrated IEEE 802.3af
PoE-PD Interface Controller
Description
The NCP1090, NCP1091 and NCP1092 are members of
ON Semiconductor’s high power HIPOt Power over Ethernet
Powered Device (PoE−PD) product family and integrate an IEEE
802.3af PoE−PD interface controller.
The 3 variants all incorporate the required functions as such
detection, classification, under voltage lockout, inrush and operational
current limit. A power good signal has been added to guarantee a good
enabling/disabling of the DC−DC controller. In addition, the
NCP1091 offers a programmable under−voltage while the NCP1092
provide an auxiliary pin for applications supporting auxiliary supplies.
The NCP1090, NCP1091 and NCP1092 are fabricated in a robust
high voltage process and integrates a rugged vertical N−channel
DMOS suitable for the most demanding environments and capable of
withstanding harsh environments such as hot swap and cable ESD
events.
The NCP1090, NCP1091 and NCP1092 complement
ON Semiconductor’s ASSP portfolio in industrial devices and can be
combined with stepper motor drivers, CAN bus drivers and other
high−voltage interfacing devices to offer complete solutions to the
industrial and security market.
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SOIC−8
S SUFFIX
CASE 751AZ
PIN CONFIGURATION
INRUSH
•
•
•
•
Fully Supports IEEE 802.3af Specifications
Programmable Classification Current
Adjustable Under Voltage Lock Out (NCP1091 Only)
Open−Drain Power Good Indicator
130 mA Inrush Current Limit
500 mA Operational Current Limit
Pass Switch Disabling Input for Rear Auxiliary Supply Operation
(NCP1092 Only)
Over−temperature Protection
Industrial Temperature Range −40°C to 85°C with Full Operation up
to 125°C Junction Temperature
0.5 W Hot−swap Pass−switch
Vertical N−channel DMOS Pass−switch Offers the Robustness of
Discrete MOSFETs
1
VPORTP
*
CLASS
PGOOD
DET
VPORTN
RTN
(Top View)
* NCP1090 = NC
NCP1091 = UVLO
NCP1092 = AUX
Features
•
•
•
•
•
•
•
TSSOP−8
T SUFFIX
CASE 948S
8
XXXXX
AYWWG
G
1
XXXXXX = Specific Device Code
A
= Assembly Location
Y
= Year
WW
= Work Week
G
= Pb−Free Package
ORDERING INFORMATION
Device
Package
Shipping†
NCP109xxxx
SOIC−8
(Pb−Free)
2500/Tape &
Reel
NCP109xxxx
TSSOP−8
(Pb−Free)
2500/Tape &
Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2011
February, 2011 − Rev. 2
1
Publication Order Number:
NCP1090/D
NCP1090, NCP1091, NCP1092
VPORTP
DETECTION
DET
INTERNAL
SUPPLY
&
VOLTAGE
REFERENCE
THERMAL
SHUTDOWN
UVLO
EXTERNAL
SELECTION
UVLO
NCP1091 only
CLASS
CLASSIFICATION
VPORT
MONITOR
IEEE Interface
Shutdown
(AUX supply priority)
AUX
NCP1092 only
HOT SWAP SWITCH
INRUSH
INRUSH &
OPERATIONAL
CURRENT LIMIT
CONTROL & CURRENT
POWER GOOD
INDICATOR
PGOOD
LIMIT BLOCKS
RTN
VPORTN
Figure 1. NCP1090/91/92 Functional Block Diagram
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2
NCP1090, NCP1091, NCP1092
Simplified Application Diagrams
RJ−45
VPORTP
Rdet
DB1
DET
Cline
Z_line
Rclass
Rinrush
PGOOD
CLASS
To DC−DC
Converter
Cpd
Data
Pairs
NCP1090
INRUSH
RTN
DB2
Spare
Pairs
NC
VPORTN
Figure 2. Typical Application Circuit using the NCP1090
RJ−45
VPORTP
Rdet
DB1
DET
Cline
Z_line
Rclass
Rinrush
PGOOD
CLASS
NCP1091
INRUSH
Ruvlo1
Spare
Pairs
Cpd
Data
Pairs
RTN
DB2
UVLO
Ruvlo2
VPORTN
Figure 3. Typical Application Circuit using the NCP1091 with External UVLO Setting
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3
To DC−DC
Converter
NCP1090, NCP1091, NCP1092
Table 1. PIN DESCRIPTION
Pin No.
Name
NCP1090
NCP1091
NCP1092
Type
INRUSH
1
1
1
Output
Current limit programming pin. Connect a resistor between
INRUSH and VPORTN.
CLASS
2
2
2
Output
Classification current programming pin. Connect a resistor
between CLASS and VPORTN.
DET
3
3
3
Output,
Open Drain
Detection pin. Connect a 24.9 kW resistor between DET and
VPORTP for a valid PD detection signature.
VPORTN
4
4
4
Ground
Negative input power. Connected to the source of the internal
pass−switch
RTN
5
5
5
Ground
DC−DC controller power return. Connected to the drain of the
internal pass−switch
PGOOD
6
6
6
Output,
Open Drain
NC
7
−
−
−
UVLO
−
7
−
Input
Under−voltage lockout input. Voltage with respect to VPORTN.
Connect a resistor−divider from VPORTP to UVLO to
VPORTNx to set an external UVLO threshold.
AUX
−
−
7
Input
Auxiliary Pin. When this pin is pulled up, the Pass Switch is
disabled and allows a supply transition from PSE to the rear
auxiliary supply connected between VPORTP and RTN.
VPORTP
8
8
8
Input
Positive input power. Voltage with respect to VPORTN.
Description
Open Drain Power Good Indicator. Pin is in HZ mode when the
power good signal is active.
No connection
Operating Conditions
Table 2. ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Min
Max
Units
Conditions
VPORTP
Input power supply
−0.3
72
V
Voltage with respect to VPORTN
RTN
Analog ground supply 2
−0.3
72
V
Pass−switch in off−state (voltage with respect to VPORTN)
CLASS
Analog output
−0.3
72
V
Voltage with respect to VPORTN
INRUSH
Analog output
−0.3
3.6
V
Voltage with respect to VPORTN
AUX
Analog input
−0.3
72
V
Voltage with respect to VPORTN
UVLO
Analog input
−0.3
3.6
V
Voltage with respect to VPORTN
PGOOD
Analog output
−0.3
72
V
Voltage with respect to RTN
Ta
Ambient temperature
−40
85
°C
Tj
Junction temperature
−
125
°C
Tj−TSD
Junction temperature
(Note 1)
−
175
°C
Tstg
Storage Temperature
−55
150
°C
TθJA
Thermal Resistance,
Junction to Air (Note 2)
150
160
240
260
°C/W
ESD−HBM
Human Body Model
2
kV
per EIA−JESD22−A114 standard
ESD−CDM
Charged Device Model
500
V
per ESD−STM5.3.1 standard
ESD−MM
Machine Model
200
V
per EIA−JESD22−A115−A standard
LU
Latch−up
±100
mA
Thermal shutdown condition
SOIC−8
TSSOP−8
per JEDEC Standard JESD78
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Tj−TSD allowed during error conditions only. It is assumed that this maximum temperature condition does not occur more than 1 hour
cumulative during the useful life for reliability reasons.
2. Low qJA is obtained with 2S2P test board (2 signal − 2 plane). High qJA is obtained with double sideboard with minimum pad area and natural
convection. Refer to Jedec JESD51 for details.
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4
NCP1090, NCP1091, NCP1092
Recommended Operating Conditions
Operating conditions define the limits for functional operation and parametric characteristics of the device. Note that the
functionality of the device outside the operating conditions described in this section is not warranted. Operating outside the
recommended operating conditions for extended periods of time may affect device reliability.
Table 3. OPERATING CONDITIONS (All values are with respect to VPORTN unless otherwise noted.)
Symbol
Parameter
Min
Typ
Max
Units
Conditions
57
V
VPORT = VPORTP –
VPORTN
INPUT SUPPLY
VPORT
Input supply voltage
0
SIGNATURE DETECTION
Offset_det1
I(VPORTP) + I(RTN)
2
5
mA
VPORTP = RTN = 1.9 V
Rdet = 24.9 KW
Sleep_det1
I(VPORTP) + I(RTN)
15
21
mA
VPORTP = RTN = 9.8 V
Rdet = 24.9 KW
Offset_det2
I(VPORTP) + I(RTN) + I(DET)
73
77
81
mA
VPORTP = RTN = 1.9 V
Rdet = 24.9 KW
Sleep_det2
I(VPORTP) + I(RTN) + I(DET)
390
400
412
mA
VPORTP = RTN = 9.8 V
Rdet = 24.9 KW
Vcl_on
Classification current turn−on lower
threshold
9.8
11.3
13
V
VPORTP rising
Vcl_off
Classification current turn−off upper
threshold
21
24
V
VPORTP rising
Vclass_reg
Classification buffer output voltage
9.8
V
13 V < VPORTP < 21 V
Icl_bias
I(vportp) quiescent current during
classification
600
mA
I(class) excluded
13 V < VPORTP < 21 V
Iclass0
Class 0: Rclass 4420 W (Note 3)
0
−
4
mA
13 V < VPORTP < 21 V
Iclass1
Class 1: Rclass 953 W (Note 3)
9
−
12
mA
13 V < VPORTP < 21 V
Iclass2
Class 2: Rclass 549 W (Note 3)
17
−
20
mA
13 V < VPORTP < 21 V
Iclass3
Class 3: Rclass 357 W (Note 3)
26
−
30
mA
13 V < VPORTP < 21 V
Iclass4
Class 4: Rclass 255 W (Note 3)
36
−
44
mA
13 V < VPORTP < 21 V
CLASSIFICATION
UVLO − INTERNAL SETTING − NCP1090/91/92
Vuvlo_on
Default turn on voltage
−
37
40
V
VPORTP rising
Vuvlo_off
Default turn off voltage
29.6
31
−
V
VPORTP falling
Vhyst_int
UVLO internal hysteresis
−
6
−
V
Uvlo_filter
UVLO On / Off filter time
−
100
−
mS
For information only
VPORTP rising
UVLO − EXTERNAL SETTING – NCP1091 ONLY
25
−
50
V
Vuvlo_on2
Vuvlo_pr
External UVLO turn on voltage
1.14
1.2
1.26
V
Vhyst_off2
External UVLO turn off voltage
0.95
1
1.05
V
−
2.5
−
mA
Uvlo_ipd
UVLO external programming range
UVLO internal pull down current
AUXILIARY SUPPLY SETTING – NCP1092 ONLY
Aux_h
AUX input high level voltage
3.1
−
Aux_l
AUX input low level voltage
−
−
0.6
V
100
−
−
KW
Aux_pd
AUX internal pull down resistor
3. A tolerance of 1% on the Rclass resistor is included in the min/max values.
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5
V
For information only
NCP1090, NCP1091, NCP1092
Table 3. OPERATING CONDITIONS (All values are with respect to VPORTN unless otherwise noted.)
Symbol
Parameter
Min
Typ
Max
Units
Conditions
Pass−switch Rds−on
−
0.5
1
W
I_inrush
Inrush current with Rinrush = 178 kW
75
120
170
mA
Measured at
RTN−VPORTN = 3 V
I_ilim
Operating current limit with Rinrush =
178 kW
425
500
575
mA
Current limit threshold
PASS−SWITCH AND CURRENT LIMITING
Ron
Measured with I(RTN) =
200 mA
POWER GOOD INDICATOR
Vds_pgood_on
RTN−VPORTN threshold voltage
required for power good status
0.8
1
1.2
V
RTN−VPORTN falling
Vds_pgood_off
RTN−VPORTN latchoff threshold
voltage
9
10
11
V
RTN−VPORTN rising
mS
Rising and falling /
for information only
Pgood_filter
PGOOD filter time
100
Ipgood
I(PGOOD) sinking current
−
−
5
mA
Vpgood_low
PGOOD voltage output low
−
0.2
0.5
V
Voltage with respect to RTN
−
600
900
mA
VPORTP = 48 V
150
−
−
°C Tj
Tj = junction temperature
−
15
−
°C Tj
Tj = junction temperature
CURRENT CONSUMPTION
IvportP
I(VPORTP) internal current
consumption
THERMAL SHUTDOWN
TSD
Thermal shutdown threshold
Thyst
Thermal hysteresis
THERMAL RATINGS
Ta
Ambient temperature
−40
−
85
°C
Tj
Junction temperature
−
−
125
°C
3. A tolerance of 1% on the Rclass resistor is included in the min/max values.
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6
NCP1090, NCP1091, NCP1092
Description of Operation
Under Voltage Lock Out (UVLO)
The NCP1090/91/92 incorporate a fixed under voltage
lock out (ULVO) circuit which monitors the input voltage
and determines when to turn on the pass switch and charge
the dc−dc converter input capacitor before the power up of
the application.
The NCP1091 offers a fixed or adjustable Vuvlo_on
threshold depending if the UVLO pin is used or not. In
Figure 5, the UVLO pin is strapped to ground and the
Vuvlo_on threshold is defined by the internal level.
Powered Device Interface
The integrated PD interface supports the IEEE 802.3af
defined operating modes: detection signature, current
source classification, undervoltage lockout, inrush and
operating current limits. The following sections give an
overview of these previous processes.
Detection
During the detection phase, the incremental equivalent
resistance seen by the PSE through the cable must be in the
IEEE 802.3af standard specification range (23.70 kW to
26.30 kW) for a PSE voltage from 2.7 V to 10.1 V. In order
to compensate for the non−linear effect of the diode bridge
and satisfy the specification at low PSE voltage, the
NCP1090/91/92 present a suitable impedance in parallel
with the 24.9 kW Rdet external resistor. For some types of
diodes (especially Schottky diodes), it may be necessary to
adjust this external resistor.
The Rdet resistor has to be inserted between VPORTP and
DET pins. During the detection phase, the DET pin is pulled
to ground and goes in high impedance mode (open−drain)
once the device exit this mode, reducing thus the current
consumption on the cable.
VPORTP
VPORTN1,2
Figure 5. Default Internal UVLO Configuration
(NCP1091 only)
To define the UVLO threshold externally, the ULVO pin
must be connected to the center of an external resistor
divider between VPORTP and VPORTN as shown in
Figure 6.
In order to guarantee the detection signature, the
equivalent input resistor made of the Ruvlo1, Ruvlo2 and
Rdet should be equal to 24.9 kW.
Classification
Once the PSE device has detected the PD device, the
classification process begins. In classification, the PD
regulates a constant current source that is set by the external
resistor RCLASS value on the CLASS pin. Figure 4 shows
the schematic overview of the classification block. The
current source is defined as:
Iclass +
UVLO
VPORT
9.8 V
Rclass
VPORTP
Ruvlo1
Class_enable
VPORTP
DET
VPORT
VPORTP
EN
Rdet
1.2 V
UVLO
Ruvlo2
VPORTN1,2
CLASS
NCP1091
9.8 V
Figure 6. Default Internal UVLO Configuration
(NCP1091 only)
For a Vuvlo_on desired turn−on voltage threshold,
Ruvlo1 and Ruvlo2 can be calculated using the following
equations:
VPORTN
Ruvlo +
Figure 4. Classification Block Diagram
Power Mode
When the classification hand−shake is completed, the
PSE and PD devices move into the operating mode.
24.9 k @ Rdet
Rdet * 24.9 k
with
Ruvlo1 ) Ruvlo2 + Ruvlo
and
Ruvlo2 +
1.2
@ Ruvlo
Vuvlo_on
With:
Vuvlo_on: Desired Turn−On voltage threshold
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7
NCP1090, NCP1091, NCP1092
Example for a Targeted Uvlo_on of 35 V:
and the PD application against excessive transient current
and failure on the dc−dc converter output.
Once the input supply reached the Vulvo_on level, the
charge of Cpd capacitor starts with a current limitation set to
to the INRUSH level. When this capacitor is fully charged,
the current limit switches without any spikes from the inrush
current to the operational current level and the power good
indicator on PGOOD pin is turned on. The capacitor is
considered to be fully charged once the following conditions
are satisfied:
1. The drain−source voltage of the Pass Switch has
decreased below the Vds_pgood_on level (typical
1 V)
2. The gate−source voltage of the Pass Switch is
sufficiently high (above 2 V typical) which means
the current in the pass switch has decreased below
the current limit.
This mechanism is depicted in the following Figure 7.
Let’s start with a Rdet of 30.1 kΩ. This gives a Ruvlo of
144 kΩ made with a Ruvlo2 of 4.99 kΩ and a Ruvlo1 of
140 kΩ (closest values from E96 series). Note that there is
a pull down current of 2.5 mA typ on the UVLO. Assuming
the previous example, this pull down current will create a
(non critical) systematic offset of 350 mV on the Uvlon_on
level of 35 V.
The external UVLO hysteresis on the NCP1091 is about
15 percent typical.
Inrush and Operational Current Limitations
Both inrush and operational current limit are defined by
an external Rinrush resistor connected between INRUSH
and VPORTN. The low inrush current limit allows smooth
charge of large dc−dc converter input capacitor by limiting
the power dissipation over the internal pass switch. In power
mode, the operational current limit protects the pass switch
PGOOD
Pgood_on
Inrush current limit 0
Operational current limit
1
Pgood_on
Delay
100 mS
&
detector
VDDA1
VDDA1
1 V / 10 V
VDDA1
2V
RTN
Vds_pgood comparator
Vgs_pgood comparator
RTN
VPORTNx
Sense Resistor
Pass Switch
Figure 7. Inrush and Operational Current Limitation Selection Mechanism
PGOOD Indicator
The operational current limit and the power good
indicator stays active as long as RTN voltage stays below the
vds_pgood_off threshold (10 V typical) and the input supply
stay above the Vulvo_off level. Therefore, fast and large
voltage step lower than 10 V are tolerated on the input
without interruption of the converter controller. Higher
input transient will not affect the behavior if RTN does not
exceed 10 V for more than 100 mS. Such input voltage steps
may be introduced by a PSE which is switched to a higher
power supply. In case RTN is still above 10 V after this delay,
the power good is turned off and the pass switch current limit
falls back to the inrush level.
The NCP1090/91/92 integrate a Power Good indicator
circuitry indicating the end of the dc−dc converter input
capacitor charge, and the enabling of the operational current
limit. This indicator is implemented on the PGOOD pin
which goes in open drain state when active and which is
pulled to ground during turn off.
A possible usage of this PGOOD pin is illustrated in
Figure 8. During the inrush phase, the converter controller
is forced in standby mode due to the PGOOD pin forcing low
the under voltage lock out pin of the controller. Once the Cpd
capacitor is fully charged, PGOOD goes in open drain state,
allowing the start up sequence of the converter controller.
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8
NCP1090, NCP1091, NCP1092
VPORTP
VDD
Rdet
DET
Rclass
Rinrush
UVLO
NCP103x
DC−DC Converter
Controller
PGOOD
Cpd
CLASS
OVLO
NCP1090
GATE
VSS
INRUSH
RTN
VPORTN
Figure 8. Power GOOD Implementation
Auxiliary Supply
To support application connected to non−PoE enabled
networks and minimize the bill of materials, the NCP1093
supports drawing power from an external supply and allows
simplified designs with PoE or auxiliary supply priorities.
In most of the cases, the auxiliary supply is connected
between VPORTP and RTN with a serial diode between
VPORTP and VAUX, as shown in Figure 9.
RJ−45
VAUX (+)
VPORTP
Rdet
DB1
DET
Cline
Z_line
Rclass
Rinrush
PGOOD
CLASS
Cpd
Data
Pairs
To DC−DC
Converter
NCP1092
INRUSH
RTN
Spare
Pairs
DB2
AUX
VPORTN
VAUX (−)
Figure 9. Auxiliary Supply Dominant PD Interface
The NCP1092 offers an AUX input pin which turns off the
pass switch when pulled high. This feature is useful for PD
applications where the auxiliary supply has to be dominant
over the PoE supply. When the auxiliary supply is inserted
on a POE powered application, the pass switch
disconnection will move the current path from the PSE to the
rear auxiliary supply. Since the current delivered by the PSE
will goes below the DC MPS level (specified in IEEE
802.3 af/at standard), the PSE will disconnect the PoE−PD
and the application will remain supplied by the auxiliary
supply. The transition will happens without any power
conversion interruption since the PGOOD indicator stays
active (high impedance state).
Next Figure 10 depicts an other PD application where the
POE supply is dominant over the VAUX supply. A diode D1
has been added in order to not corrupt the PD detection
signature when the dc−dc converter is supplied by VAUX.
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NCP1090, NCP1091, NCP1092
VAUX (+)
RJ−45
D1
VPORTP
Rdet
DB1
DET
Rinrush
PGOOD
CLASS
Cpd
Rclass
Cline
Z_line
Data
Pairs
NCP1092
To DC−DC
Converter
INRUSH
RTN
Spare
Pairs
DB2
AUX
VPORTN
VAUX (−)
Figure 10. PoE Supply Dominant PD Interface
Thermal Shutdown
Company or Product Inquiries
The NCP1090/91/92 include a thermal shutdown which
protect the device in case of high junction temperature. Once
the thermal shutdown (TSD) threshold is exceeded, the
classification block, the pass switch and the PGOOD
indicator are disabled. The NCP109X returns automatically
to normal operation once the die temperature has fallen
below the TSD low limit.
For more information about ON Semiconductor’s Power
over Ethernet products visit our Web site at
http://www.onsemi.com.
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10
NCP1090, NCP1091, NCP1092
PACKAGE DIMENSIONS
SOIC−8
CASE 751AZ−01
ISSUE O
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11
NCP1090, NCP1091, NCP1092
PACKAGE DIMENSIONS
TSSOP−8
CASE 948S−01
ISSUE C
8x
0.20 (0.008) T U
K REF
0.10 (0.004)
S
2X
L/2
8
L
0.20 (0.008) T U
T U
1
J J1
4
V
ÇÇÇÇ
ÉÉÉÉ
ÉÉÉÉ
ÇÇÇÇ
ÉÉÉÉ
ÇÇÇÇ
SECTION N−N
−W−
C
0.076 (0.003)
D
−T− SEATING
PLANE
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A DOES NOT INCLUDE MOLD FLASH.
PROTRUSIONS OR GATE BURRS. MOLD FLASH
OR GATE BURRS SHALL NOT EXCEED 0.15
(0.006) PER SIDE.
4. DIMENSION B DOES NOT INCLUDE INTERLEAD
FLASH OR PROTRUSION. INTERLEAD FLASH OR
PROTRUSION SHALL NOT EXCEED 0.25 (0.010)
PER SIDE.
5. TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
6. DIMENSION A AND B ARE TO BE DETERMINED
AT DATUM PLANE -W-.
S
K1
K
A
−V−
S
S
5
B
−U−
PIN 1
IDENT
M
DETAIL E
G
0.25 (0.010)
N
M
N
DIM
A
B
C
D
F
G
J
J1
K
K1
L
M
MILLIMETERS
MIN
MAX
2.90
3.10
4.30
4.50
--1.10
0.05
0.15
0.50
0.70
0.65 BSC
0.09
0.20
0.09
0.16
0.19
0.30
0.19
0.25
6.40 BSC
0_
8_
INCHES
MIN
MAX
0.114
0.122
0.169
0.177
--0.043
0.002
0.006
0.020
0.028
0.026 BSC
0.004
0.008
0.004
0.006
0.007
0.012
0.007
0.010
0.252 BSC
0_
8_
F
DETAIL E
All brand names and product names appearing in this document are registered trademarks or trademarks of their respective holders.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
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