RT7300

  • IEEE802.3at and IEEE802.3af compliant
  • Maximum 30W output power
  • Input voltage range 36V to 57V
  • Integral high efficiency DC/DC converter.
  • Low output ripple and noise
  • High performance with low price
  • Short-circuit protection
  • Adjustable Output
  • Transformer isolation ,1500V isolation (input to output)
  • Easy to use, with a minimum number of external components.

相关产品

 
 

RT7300

  IEEE802.3 AT POE PD Module ( Isolation Model)

Product Description

Version

Date

Author

Approved By

Remarks

V1.0

2018/1/14

LI xiao yan

Rock

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

© 2018 Shenzhen Ring&tone  Electronic Technology Co., Ltd. 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.

 

Features

  • IEEE802.3at and IEEE802.3af compliant
  • Maximum 30W output power
  • Input voltage range 36V to 57V
  • Integral high efficiency DC/DC converter.
  • Low output ripple and noise
  • High performance with low price
  • Short-circuit protection
  • Adjustable Output
  • Transformer isolation ,1500V isolation (input to output)
  • Easy to use, with a minimum number of external components.

Applications

  • IP Cameras
  • Wireless access point
  • Security and alarm systems
  • VOIP telephone
  • Point of sale network terminal equipment

Description

The RT7300 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 RT7300 signature and control circuit provides the PoE compatibility signature and

power classification required by the Power Sourcing Equipment (PSE) before applying up

to 30W 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.

    

  • RT7300 Product Selector

 

Part Number

Nominal Output Voltage

Maximum Output Power*

AT DET

Marking

Package

RT7300

12V

30W*

YES

12V

DIP

RT7300B

12V

30W*

NO

12V

DIP

*At 25°C with VIN = 48V

*Maximum Output Power: means it not could be operated in continuous stage .only short-term of Boot up/Heavy loading

 

  • Pin Description:

J1

Pin #

Name

Description

1

VIN-

POE Direct Input -.  This pin connects to the negative (-) output of the POE input bridge rectifiers. This pin is internally connected to pin 6.

2

AT-DET

AT Detect Output. This pin indicates if an IEEE802.3at PSE is supplying power to the RT7300,

RT7300B this pin is floating.

3

VIN+

POE Direct Input +. This pin connects to the positive (+) output of the POE input bridge rectifiers.

4

5

I_GND

Internal GND .

6

VIN-

POE Direct Input -.  This pin connects to the negative (-) output of the POE input bridge rectifiers. This pin is internally connected to pin 1.

 

 

 

 

 

 

 

 

J2

Pin #

Name

Description

7

VDC-

Negative DC Output. These pins are internally connected and provide the negative regulated output from the RT7300.

8

9

ADJ

Output Adjust. The output voltage can be adjusted from its nominal value, by connecting an external resistor from this pin to either the VDC+ pin or the VDC- pin.

10

VDC+

Positive DC Output. These pins are internally connected and provide the positive regulated output from the RT7300.

11

 

  • Recommended Operating Conditions

 

Parameter

Symbol

Min

Typ

Max

Units

1

Input Supply Voltage1

VIN

36

48

57

V

2

Under Voltage Lockout

VLOCK

30

 

36

V

3

Operating Temperature2

TOP

-20

25

70

Ta / OC

 

 

4

Operating Temperature

30W Continuous

24W Continuous

14W Continuous

 

 

TOP

 

 

 

-40

 

 

 

25

 

50

70

85

 

 

 

Ta / °C

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

11.5

12.0

12.5

V

 

2

Line Regulation

VLINE

 

0.1

 

%

@ 50% Load

3

Load Regulation

VLOAD

 

1

 

%

@ VIN=48V

4

Output Ripple and Noise

VRN

 

180

 

mVp-p

@ Max load2

5

Minimum Load

RLOAD

200

 

 

mA

 

6

Short-Circuit Duration3

TSC

 

 

sec

 

7

Efficiency @ 80% Load

EFF

 

87

 

%

 

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.

  • RT7300 Typical Connection Diagram:
  • Reducing the output voltage, connect R2 between ADJ and +VDC

     

    R2 Value

    output voltage

    R2 Value

    output voltage

     RT7300-12V

    open

    12V

    100K

    10.7V

     

     

     

     

     

    Increasing the output voltage, connect R1 between ADJ and -VDC

     

    R1 Value

    output voltage

    R1 Value

    output voltage

     RT7300-12V

    open

    12V

    0R

    12.7V

    • Power Classification

    The RT7300 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 RT7300 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 RT7300 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 RT7300 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 RT7300 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.

 

  • Package Size (mm   ±3mm )
  • PCB Decal (mm ±3mm )