RT7514
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All rights reserved. This document contains proprietary information of ring&tone and is not to be disclosed or used without the prior written permission of ring&tone.
Due to update and improvement of ring&tone products and technologies, information in this document is subjected to change without notice.
Related products
Features：
Applications：
Description：
The RT7514 series of modules are designed to extract power from a conventional
twisted pair Category 5 Ethernet cable, conforming to the IEEE 802.3af and IEEE 802.3at Power-over-Ethernet(PoE) standard.
The RT7514 signature and control circuit provides the PoE compatibility signature and
power classification required by the Power Sourcing Equipment (PSE) before applying up
to 18W power to the port.
The DC/DC converter operates over a wide input voltage range and provides a regulated
output. The DC/DC converter also has built-in short-circuit output protection.
Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Units
1
DC Supply Voltage
VCC
-0.3
60
V
2
DC Supply Voltage Surge for 1ms
VSURGE
-0.6
80
V
3
Storage Temperature
TS
-40
100
OC
Note 1: Exceeding the above ratings may cause permanent damage to the product. Functional operation under these conditions is not implied. Maximum ratings assume free airflow.
Recommended Operating Conditions
Parameter
Symbol
Min
Typ
Max
Units
1
Input Supply Voltage 1
VIN
36
48
57
V
2
Under Voltage Lockout
VLOCK
30
36
V
3
Operating Temperature 2
TOP
-20
25
70
Ta / OC
Note 1: With minimum load
2: See Section Operating Temperature Range
** Extended use close to, or at the maximum operating temperature can reduce the life time of the device.
DC Electrical Characteristics
DC Characteristic
Sym
Min
Typ1
Max
Units
Test Comments
1
Nominal Output Voltage
+VDC
4.75
5.0
5.25
V
2
Line Regulation
VLINE
2
%
@ 50% Load
3
Load Regulation
VLOAD
2
%
@ VIN=48V
4
Output Ripple and Noise
VRN
200
mVp-p
@ Max load
5
Minimum Load
RLOAD
200
mA
6
Short-Circuit Duration3
TSC
∞
sec
7
Efficiency @ 80% Load
EFF
88
%
@ 3A load
8
Isolation Voltage (I/O)
VISO
1500
VPK
Impulse Test
9
Temperature Coefficient
TC
0.02
%
Per OC
Note 1: Typical figures are at 25°C with a nominal 48V supply and are for design aid only. Not Guaranteed
2: The output ripple and noise can be reduced with an external filter, see application note.
3: Continuous short circuit duration is applicable at 25'C ambient temperature in free air. At higher temperatures or with restricted
airflow (e.g. in a sealed enclosure) the duration will need to be limited to avoid overheating.
RT7514 Typical Connection Diagram:
TVS Layout description
RT7514 Product Selector
Part Number
Nominal Output
Maximum Output Power
AT-DET putout
Marking
Package
RT7514-5V
5V
24W
YES
RT7514
DIP
Power Classification
The RT7514 classification is fixed at Class 4, this means that an IEEE802.3at Type 1 or an IEEE802.3af PSE will default to Class 0. However an IEEE802.3at PSE will recognise the Class 4 as a Type 2 PD.
AT Detection
The RT7514 has an AT-DET output pin which is used to detect a Two Event Physical Layer classification as described in IEEE802.3at. If required the AT-DET pin can be connected directly to an opto-coupler.
If the RT7514 detects a Two Event Physical Layer classification, the (AT True) switch will close and Opto1 will turn ON. Opto1 will be connected across the isolation barrier and the output collector can be connected to a controller (with a pull-up resistor connected to the controller’s power rail). When Opto1 is ON the collector (output) will be Logic 0, the controller will then know that the PSE is capable of delivering over 15.4W. To complete the protocol the controller should then confirm that it is a Type 2 PD over the Data Link Layer*.
If the RT7514 detects a Single Event Physical Layer classification, Opto1 will be OFF and the output collector will be Logic 1 (via pull-up resistor). The controller should then assume that the PSE is limited to delivering up to 15.4W.
If the PSE does not support the Physical Layer classification, Opto1 will be OFF. The RT7514 will operate with non IEEE802.3at compliant POE+ PSE’s.
*Note: There are several PSEs (including Cisco) that will only delivery ≤15.4W until they receive Type 2 PD confirmation, over the Data Link Layer.
PackageSize： (mm ±3mm )
Pin Description:
Pin
Name
Description
1
-VDC
DC Return. This pin is the return path for the +VDC output.
2
-VDC
DC Return. This pin is the return path for the +VDC output.
3
+VDC
DC Output. This pin provides the regulated output from the DC/DC converter.
4
+VDC
DC Output. This pin provides the regulated output from the DC/DC converter.
5
AT-DET+
AT Detect Output+ 10V voltage.
6
AT-DET-
AT Detect Output-. Integrated series 10 K resistance ,This pin indicates if an IEEE802.3at PSE is supplying power
7
VIN+
POE Direct Input +. This pin connects to the positive (+) output of the POE input bridge rectifiers.
8
VIN-
POE Direct Input -. This pin connects to the negative (-) output of the POE input bridge rectifiers.
9
CAP-
This pin connects to the capacitance negative.
Reliability MTBF:
About the life time ,we design according to the following:
1) life time of RT7514 : 100,000 hours @ 25°C
Isolation (Safetytest items) & test report
This electrical isolation shall withstand at least one of the following electrical strength tests:
RT7514 Test Requested
Test result
a) 1500Vrms at 50Hz to 60Hz for 60s, applied as specified in subclause5.2.2 of IEC60950-1:2001.
Pass
b) 2250Vdc for 60s, applied as specified in subclause5.2.2 of IEC60950-1:2001.
Pass
c) An impulse test consisting of a 1500V, 10/700μs waveform, applied 10 times, with a 60s interval between pulses. The shape of the impulses shall be 10/700μs (10μs virtual front time, 700μsvirtual time of half value), as defined in IEC60950-1:2001 Annex N.
Pass
Operating tempprofile
Mechanical / Environmental Performance data
Mechanical / Environmental Performance data
Item
Requirement and Standard
1
Resistance to Wave Soldering Heat
max Preheat Temp range & time 120 ℃ / 180S
max soldering temp &time:265 ℃ / 4S
2
Solder ability
Solder able area shall have minimum of 95% solder coverage.
And then into solder bath,Temperature at 245 ±5 ℃ , for 4-5sec.
3
Hand Soldering Temperature Resistance
T > =350 ℃ , 3sec at least.
4
Thermal Shock
subject to follow condition for 5 cycles.1 cycles:
-55 ℃ , 30 minutes
+85 ℃ , 30 minutes
5
Humidity(Temp Cycling)
less than 95% (non-condensing) ( -20 to 70 ℃)
6
Temperature Life
temperature life at 85℃ for 96 hours.
7
Salt Spray
connectors to 5% salt-solution concentration, 35 ℃
Gold flash for 8 hours there will be no change in the gold layer
Packaging type & Quantity
1.EPE Packaging, 2.Blister Packaging,
40pcs/ dish 50pcs/ dish
400pcs/box 500pcs/box