1 dc2046aef DEMO MANUAL DC2046A-E DESCRIPTION LT4276, LT4321 PoE PD with Synchronous Flyback and Ideal Diode Bridge Demonstration Circuit 2046A-E is a PoE Powered Device (PD) with an isolated power supply using synchronous flyback topology, featuring the LT ® 4276 and Ideal diode bridge controller (LT4321). The LT4276 provides IEEE802.3af (PoE, Type 1), IEEE802.3at (PoE + , Type 2), and LTPoE ++ ™ PD interfacing and power supply control. When the PD is fully powered, the PD interface switches power over from the Power Sourcing Equipment (PSE) to the switcher through an external, low resistance, high power N-channel FET. The highly inte- grated LT4276 controls a high power, small-sized power L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTPoE ++ is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY BOARD PHOTO supply that utilizes a highly efficient flyback topology with synchronous rectification. The LT4321 provides further efficiency improvement by minimizing the bridge losses. The DC2046A-E supplies a 5V output at up to 7A. It also demonstrates the use of an optional auxiliary power supply input of 50V. When present, the auxiliary supply becomes the dominant supply over PoE to provide power. Design files for this circuit board are available at http://www.linear.com/demo/DC2046A-E Specifications are at T A = 25°C Top Side Bottom Side PARAMETER CONDITIONS VALUE Port Voltage (V PORT ) At Ethernet Port 37V to 57V Auxiliary Voltage From AUX + to AUX – Terminals 37V to 57V Output Voltage 5V (Typ) Output Current 7A (Max) Output Voltage Ripple V PORT = 50V, I OUT = 7A 25mV P-P (Typ) Output Regulation ±0.06% (Typ) Efficiency V PORT = 50V, I OUT = 7A, End to End 91.5% (Typ) Switching Frequency 250kHz (Typ)
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1dc2046aef
DEMO MANUAL DC2046A-E
DESCRIPTION
LT4276, LT4321 PoE PD with Synchronous Flyback and Ideal Diode Bridge
Demonstration Circuit 2046A-E is a PoE Powered Device (PD) with an isolated power supply using synchronous flyback topology, featuring the LT®4276 and Ideal diode bridge controller (LT4321).
The LT4276 provides IEEE802.3af (PoE, Type 1), IEEE802.3at (PoE+, Type 2), and LTPoE++™ PD interfacing and power supply control. When the PD is fully powered, the PD interface switches power over from the Power Sourcing Equipment (PSE) to the switcher through an external, low resistance, high power N-channel FET. The highly inte-grated LT4276 controls a high power, small-sized power L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTPoE++ is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
BOARD PHOTO
supply that utilizes a highly efficient flyback topology with synchronous rectification. The LT4321 provides further efficiency improvement by minimizing the bridge losses.
The DC2046A-E supplies a 5V output at up to 7A. It also demonstrates the use of an optional auxiliary power supply input of 50V. When present, the auxiliary supply becomes the dominant supply over PoE to provide power.
Design files for this circuit board are available at http://www.linear.com/demo/DC2046A-E
Specifications are at TA = 25°C
Top Side Bottom Side
PARAMETER CONDITIONS VALUE
Port Voltage (VPORT) At Ethernet Port 37V to 57V
Auxiliary Voltage From AUX+ to AUX– Terminals 37V to 57V
Figure 5. Output Voltage Ripple (VPORT = 50V, 5V/7A)
5dc2046aef
DEMO MANUAL DC2046A-E
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 6. Load Transient Response (VPORT = 50V, 3.5A to 7A to 3.5A)
Figure 7. Gain and Phase Margin of the Flyback Loop (VPORT = 57V, 5V/0.7A)
6dc2046aef
DEMO MANUAL DC2046A-E
QUICK START PROCEDUREDemonstration circuit 2046A-E is easy to set up to evalu-ate the performance of the LT4276 in a PoE+ application. Refer to Figure 8 for proper equipment setup and follow the procedure below:
NOTE: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip and probe ground directly across the VOUT
+ and VOUT– terminals. See Figure 9 for proper
scope probe technique.
1. Place test equipment (voltmeter, ammeter, power sup-plies, and electronic load) as shown in Figure 8.
2. Input supplies:
a. Connect a LTPoE++ capable PSE with a CAT-5 cable to the RJ45 connector, J1. See Figure 8.
b. Or, connect a 37V to 57V capable power supply (Power Supply in Figure 8) across VPORTP and VPORTN.
c. If evaluating the auxiliary power supply (Auxiliary Supply in Figure 8), connect a 37V to 57V capable power supply across AUX+ to AUX–.
3. Check for the proper output voltage of 5V.
4. Once the proper output voltage is confirmed, adjust the load within the operating range and observe the output voltage regulation, ripple voltage, efficiency, and other parameters.
+
–
+–
DC1815A-ALTPoE++ PSE
ETHERNETCABLE
ELECTRONICLOAD
SCOPEPROBE
+
–
+
–
+
–
POWERSUPPLY
+
–
AUXILLARYSUPPLY
+ –
+
–
Figure 8. Proper Measurement Equipment Setup
Figure 9. Measuring Output Ripple
GND
VIN
7dc2046aef
DEMO MANUAL DC2046A-E
PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM5 5
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D3
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21
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6
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21
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6
4
5
87
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DAT
A2-1
DAT
A2-1
RT4
75RT4
75
DAT
A2-2
DAT
A2-2
R28 0R28 0
Q18
PSM
N07
5-10
0MSE
Q18
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6
4
5
87
123
CG
20.
01uF
100V
1206
CG
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Q12
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PSM
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Q13
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Q13
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1 2 3 6 4 5 7 8
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4 X
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Ohm
s
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2kV
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1 2 3 6 4 5 7 8
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4 X
75
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s
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1+11
TRC
T112
TRD
1-10
TRD
2+4
TRC
T26
TRD
2-5
TRD
3+3
TRC
T31
TRD
3-2
TRD
4+8
TRC
T47
TRD
4-9
VC
214
VC
113
VC
315
VC
416
SH
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J2 SS-6
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1 2 3 4 5 6 7 8
9 10
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6
4
5
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0.04
7uF
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75
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4
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RT3
75RT3
75
EP
U3
LT43
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F
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1
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2
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3
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4
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TP12
EN
11
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10
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BG1214
BG3613
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DAT
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DAT
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75RT2
75
12dc2046aef
DEMO MANUAL DC2046A-E
Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015
LT 0515 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-tion engineer.