Linear Technology DC1788B Demo Manual

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Lt4275 ltpoe++, ieee 802.3at/ ieee 802.3af compliant pd controller

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DEMO MANUAL DC1788B LT4275 LTPoE++, IEEE 802.3at/ IEEE 802.3af Compliant PD Controller

Description Demonstration circuit 1788B features the LT®4275, a fourth generation powered device (PD) controller for Power over Ethernet (PoE) applications. The DC1788B is available in DC1788B-A, DC1788B-B, and DC1788B-C versions to meet the power level required by the PD application. The DC1788B-A features the LT4275A PD controller. This controller supports the IEEE 802.3at (Type 2, PoE+), IEEE 802.3af (Type 1, PoE) and LTPoE++™ specification. LTPoE++ adds four power levels to the existing IEEE standard with 38.7W, 52.7W, 70W, and 90W of delivered PD power at the RJ45 jack. The DC1788B-B features the LT4275B PD controller and is compliant with the IEEE 802.3at and IEEE 802.3af specifications. The DC1788B-C features the LT4275C PD controller and is compliant with the IEEE 802.3af specification. The DC1788B includes an RJ45 Ethernet port, a high power Ethernet magnetic, a discrete active bridge rectifier, a surge protector, an external N-channel FET, and the LT4275. The discrete active bridge rectifier is used to achieve higher efficiency than a conventional diode bridge rectifier. Many of the main features from the previous generation PD controller are included in this generation PD

controller. These include a power good indicator, a power sourcing equipment (PSE) type indicator, and support for an auxiliary power input. The major difference from the previous generation PD controller is that the LT4275 drives an external N-channel Hot Swap™ FET at the PoE high side voltage rail. This allows the user to choose a low RDS(ON) N-channel MOSFET to maximize power efficiency, reduce heat dissipation, and ease thermal design. An LED status indicator is included to indicate the Hot Swap FET is fully turned on and the PSE is powering the PD. A sufficient load to sink more than 10mA is also included to assure the PSE maintains power to the PD and to meet the DC maintain power signature current required by the IEEE 802.3at/IEEE 802.3af specification. Simply connect the output of the DC1788B to the DC/DC converter that is right for the application. Linear Technology offers a variety of DC/DC converter solutions that can be used with the DC1788B (eg DC894, DC1317, etc). Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTPoE++ and Hot Swap are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

Table 1. Summary of Features Supported by the DC1788B Assemblies ASSEMBLY DC1788B-A

DC1788B-B DC1788B-C

PoE STANDARD LTPoE++ PoE+ PoE PoE+ PoE PoE

MAXIMUM POWER LEVEL

POWER GOOD INDICATOR (PWRGD)

PSE TYPE INDICATOR (T2P)

AUXILIARY SUPPLY SUPPORT

90W

Yes

Yes

No

25.5W

Yes

Yes

Yes

13W

Yes

No

Yes

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DEMO MANUAL DC1788B Performance summary Table 2. DC1788B Performance Summary PARAMETER PD Input Voltage After Start-Up (VPORT)

Efficiency

PoE Type Switching Frequency

CONDITION

VALUE

At the PD Ethernet Port LTPoE++ 38.7W LTPoE++ 52.7W

49.8V to 57V

LTPoE++ 70W LTPoE++ 90W

45.1V to 57V

IEEE 802.3at (Type 2, 25.5W)

42.5V to 57V

IEEE 802.3af (Type 1, 13W)

37V to 57V

47.8V to 57V 41.0V to 57V

DC1788B-A, VPORT = 48V, ILOAD = 1.1A

99.1% (Typical)

DC1788B-B, VPORT = 48V, ILOAD = 600mA

98.9% (Typical)

DC1788B-C, VPORT = 48V, ILOAD = 350mA An LTPoE++ PSE is Powering a DC1788B-A

99.1% (Typical) 840Hz

Theory of Operation When an LTPoE++ PSE is connected to the DC1788B demo board RJ45 connector, J1, via a CAT5e or CAT6 Ethernet cable, the PSE initiates the detection process. During this process, the discrete active bridge acts as a standard diode bridge and the PD solution presents a 25k resistive load to the PSE. After the PD has passed the detection process, the PSE uses an IEEE 802.3at/IEEE 802.3af or LTPoE++ classification method to determine the power level the PSE can deliver to the PD. The PSE turns on the port and provides power to the PD if the classification is successful. During turn on, the MOSFETs of the discrete active bridge are fully enhanced with low RDS(ON) in the high current path. This reduces the power and heat dissipation compared to the conventional diode bridge. Once the LT4275 detects the PSE has turned on the port, it drives an external N-channel MOSFET to ramp up the output voltage. After a successful PD controller output turn on, the LT4275 drives a power good indicator (PWRGD) and a PSE Type indicator (T2P) (DC1788B-A and DC1788B‑B only). The PWRGD indicator signals the load to start drawing current and the T2P indicator signals the load the type of PSE powering the PD. Classification Signaling The resistors at RCLS and RCLS++ determine the classification signature and sequence. The DC1788B-A includes user-selectable jumpers to support IEEE 802.3af,

IEEE 802.3at, and LTPoE++ power levels from 3.84W to 90W. Refer to Table 3 for the power levels. If an LTPoE++ power level is selected, an IEEE 802.3af or IEEE 802.3at compliant PSE will classify this PD as a Class 4 PD. The DC1788B‑B includes a preselected RCLS resistor to support IEEE 802.3at 2-event classification and this board does not contain jumper blocks. The DC1788B-C includes multiple jumpers to support all IEEE 802.3af power levels. Table 3 shows each shunt position and its associated class number and power level for the DC1788B-A and -C boards. Use Table 3 as a selection guide to choose a suitable power level for the load. Table 3. DC1788B-A and DC1788B-C Shunt Positions for PoE Power Levels ASSEMBLY

PoE POWER LEVEL AT CLASS THE PD INPUT

RCLASS JUMPERS

DC1788B-A & -C

0

13W

JP1

JP2

DC1788B-A & -C

1

3.84W

JP3

JP4

DC1788B-A & -C

2

6.49W

JP5

JP6

DC1788B-A & -C

3

13W

JP7

JP8

DC1788B-A

4

25.5W

JP9

JP10

DC1788B-A

4*

38.7W

JP11

JP12

DC1788B-A

4*

52.7W

JP13

JP14

DC1788B-A

4*

70W

JP15

JP16

DC1788B-A 4* 90W JP17 JP18 *An LTPoE++ PD will be classified as Class 4 by an IEEE 802.3at/af compliant PSE. dc1788bfa

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DEMO MANUAL DC1788B Theory of Operation Power Good Indicator and Power Supply Start-Up

Auxiliary Supply Support

The LT4275 limits the inrush current to the output bulk capacitor by controlling the output voltage slew rate during turn-on. The slew rate is preprogrammed via a resistor and a capacitor at the LT4275 HSGATE pin on the DC1788B to limit the inrush current to the bulk capacitor on board. If more capacitance is desired at the output, refer to Inrush and Powered On section in the LT4275 data sheet to recalculate the inrush current and ensure it is below the IEEE requirement of approximately 100mA. The inrush current limit will cause startup problems if an attached load draws more than 100mA of current during inrush. Therefore, it is strongly recommended to use the PWRGD indicator on the DC1788B to interface to a load such as a DC/DC converter as shown in Figures 1, 2 and 4.

The DC1788B-B and DC1788B-C versions support an auxiliary supply input. The auxiliary supply input has priority over the PoE input. When the PD controller detects a valid voltage from the auxiliary supply input, it turns off the N-channel MOSFET (Q2) to cut the power from the PSE and lets the auxiliary supply take over powering the load. The PSE may detect the disconnected PD and turn off the port. The PWRGD indicator outputs a logic high signal when an auxiliary supply is present. The T2P indicator outputs a logic low signal on the DC1788B-B board when an auxiliary supply is present. The auxiliary supply input is an assembly option on the DC1788B-A board.

PSE Type Indicator Refer to Table 4 for the summary of T2P indicator signals supported by the DC1788B assembly. The T2P signal is valid after PWRGD is active. This indicator is not connected on the DC1788B-C. Table 4. Summary of T2P Signals Supported by the DC1788B Assemblies ASSEMBLY DC1788B-A

DC1788B-B

DC1788B-C

PSE TYPE LTPoE++

T2P SIGNAL 840Hz, 50% Duty Cycle

IEEE 802.3at (Type 2, PoE+)

Logic Low

IEEE 802.3af (Type 1, PoE)

Logic High

LTPoE++

Logic Low

IEEE 802.3at (Type 2, PoE+)

Logic Low

IEEE 802.3af (Type 1, PoE)

Logic High

Any PSE

Not Supported

DC1788B Companion PSE Demo Boards Linear Technology offers a variety of PSE solutions to evaluate with DC1788B. Refer to Table 5 to select a PSE demo board based on the DC1788B assembly and the application power requirement. Table 5. Selection of Companion PSE Demo Board depending on the DC1788 Assembly and the PoE Power Level DC1788 ASSEMBLY

PoE POWER LEVEL

COMPANION PSE DEMO BOARD

DC1788B-A

90W

DC1814A-D

70W

DC1814A-C

52.7W

DC1814A-B

38.7W

DC1814A-A

DC1788B-B

25.5W

DC1567A

DC1788B-C

13W

DC981A/B

**Contact Linear for multi-port PSE demo board options.

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DEMO MANUAL DC1788B DC1788B-A quick Start Procedure NOTE: Handle the DC1788B-A by the edge of the board. Power over Ethernet Input 1. Refer to Figure 1 to evaluate the DC1788B-A with a DC/DC converter. If a resistive load is used to evaluate the DC1788B-A, connect the load by hand between VOUT+ and VOUT– after the LED (D3) is lit. It is recommended to disconnect the resistive load before powering down the DC1788B-A, so at the next turn on the load is disconnected. If the load is not connected and disconnected by hand properly, the PD may not power on. Contact field applications engineers for further details. 2. Default class select shunt positions are at JP1 and JP2 on the DC1788B-A board. In this configuration, any PSE will turn on this PD. Choose a power level from Table 3 and select the corresponding shunt positions.

3. Check the power delivery capability of the LTPoE++ PSE to ensure it can power the PD and the load. Do not select a jumper position corresponding to a higher power level than the LTPoE++ PSE can provide. Otherwise, the LTPoE++ PSE will not turn on the PD after classification. 4. Connect the output of the PSE to the RJ45 connector (J1) on the DC1788B-A board with a CAT5e or CAT6 Ethernet cable. 5. After connection has been established, verify that the LED (D3) is lit. This indicates the PSE has successfully detected and powered the PD

Figure 1. Setup Diagram for the DC1788B-A with a DC/DC Converter, a Microprocessor, and an LTPoE++ PSE

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DEMO MANUAL DC1788B DC1788B-B quick Start Procedure NOTE: Handle the DC1788B-B by the edge of the board. Power over Ethernet Input 1. Refer to Figure 2 to evaluate the DC1788B-B with a DC/DC converter. If a resistive load is used to evaluate the DC1788B-B, connect the load by hand between VOUT+ and VOUT– after the LED (D3) is lit. It is recommended to disconnect the resistive load before powering down the DC1788B-B, so at the next turn on the load is disconnected. If the load is not connected and disconnected by hand properly, the PD may not power on. Contact field applications engineers for further details. 2. Connect the output of the PSE to the RJ45 connector (J1) on the DC1788B-B board with a CAT5e or CAT6 Ethernet cable.

3. After connection has been established, verify that the LED (D3) is lit. This indicates the PSE has successfully detected and powered the PD. Auxiliary Supply Input 1. Refer to Figure 3 to evaluate the DC1788B-B with a DC/DC converter and an auxiliary DC power supply. 2. Connect the auxiliary supply to the AUX+ to AUX– inputs. Check to make sure the voltage polarity is correct before turning on the auxiliary power supply. 3. Turn on the auxiliary power supply and verify that the LED (D3) is lit.

Figure 2. Setup Diagram for the DC1788B-B with a DC/DC Converter, a Microprocessor, and a Type 2 PSE

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DEMO MANUAL DC1788B DC1788B-B quick Start Procedure

Figure 3. Setup Diagram for the DC1788B-B with a DC/DC Converter, a Microprocessor, and an Auxiliary DC Power Supply

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DEMO MANUAL DC1788B DC1788B-C quick Start Procedure NOTE: Handle the DC1788B-C by the edge of the board. Power over Ethernet Input 1. Refer to Figure 4 to evaluate the DC1788B-C with a DC/DC converter. If a resistive load is used to evaluate the DC1788B-C, connect the load by hand between VOUT+ and VOUT– after the LED (D3) is lit. It is recommended to disconnect the resistive load before powering down the DC1788B-C, so at the next turn on the load is disconnected. If the load is not connected and disconnected by hand properly, the PD may not power on. Contact field applications engineers for further details. 2. Connect the output of the PSE to the RJ45 connector (J1) on the DC1788B-C board with a CAT5e or CAT6 Ethernet cable.

3. After connection has been established, verify that the LED (D3) is lit. This indicates the PSE has successfully detected and powered the PD. Auxiliary Supply Input 1. Refer to Figure 5 to evaluate the DC1788B-C with a DC/DC converter and an auxiliary DC power supply. 2. Connect the auxiliary supply to the AUX+ to AUX– inputs. Check to make sure the voltage polarity is correct before turning on the auxiliary power supply. 3. Turn on the auxiliary power supply and verify that the LED (D3) is lit.

Figure 4. Setup Diagram for the DC1788B-C with a DC/DC Converter and a Type 1 PSE

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DEMO MANUAL DC1788B DC1788B-C quick Start Procedure

Figure 5. Setup Diagram for the DC1788B-C with a DC/DC Converter and an Auxiliary DC Power Supply

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DEMO MANUAL DC1788B quick Start Procedure

Figure 6. DC1788B-A Efficiency at Various PoE Load Currents (without LED D3)

Figure 7. Thermal Image. DC1788B-A with 90W Load. Top View dc1788bfa

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DEMO MANUAL DC1788B quick Start Procedure

Figure 8. Thermal Image. DC1788B-A with 90W Load. Bottom View

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DEMO MANUAL DC1788B parts list ITEM QTY REFERENCE Required Circuit Components 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

1 1 1 4 1 8 8 4 4 1 1 1 8 8 8 4 2

C1 C3 CG1 CT1, CT2, CT3, CT4 D2 D4-D7, D17-D20 D8-D11, D13-D16 Q3-Q6 Q9-Q12 R12 R13 R14 R18-R21, R43-R46 R23, R25, R27, R29, R34, R36, R38, R40 R24, R26, R28, R30, R35, R37, R39, R41 RT1-RT4 U2, U3

1 1 Q1 2 1 R10 3 1 R15 4 1 R31 5 2 RC1, RC6 6 2 RC2, RC8 7 2 RC3, RC10 8 2 RC4, RC5 9 1 RC7 10 1 RC9 11 1 RC11 12 1 T1 13 1 U1 Optional Circuit Components 1 0 C2 3 0 C5 4 0 D1 5 0 D12 6 0 E5,E6 7 0 Q2 8 0 Q7,Q8 9 0 R9, R22, R33, R42 6 0 R16, R17, R32 2 0 RV1-RV4

PART DESCRIPTION

MANUFACTURER/PART NUMBER

DC1788B General BOM Cap., X7R, 0.1µF, 100V, 10%, 0805 Cap., X7R, 47nF, 100V, 10%, 0805 Cap., X7R, 1nF, 2KV, 10%, 1808 Cap., X7R, 0.01µF, 10%, 200V, 0805 Diode, SMBJ58A, SMB-DIODE Diode, MMSZ5242BS, SOD-323 Diode, MMBD4148, SOT23 Trans., MMBT3904, SOT23 Trans., MMBT3906, SOT23 Res., Chip, 8.2Ω, 5%, 0603 Res., Chip, 3.3k , 5%, 0603 Res., Chip, 100k, 5%, 0603 Res., Chip, 100k, 5%, 0402 Res., Chip, 4.3k , 5%, 0402 Res., Chip, 3.6k , 5%, 0402 Res., Chip, 75Ω, 5%, 0603 Quad MOSFETs, FDMQ8203 DC1788B-A BOM Trans., FDMC86102, POWER33 Res., Chip, 0Ω, 5%, 0603 Res., Chip, 100k, 5%, 0603 Res., Chip, 10k, 1%, 0805 Res., Chip, 140Ω, 1%, 0805 Res., Chip, 76.8Ω, 1%, 0805 Res., Chip, 49.9Ω, 1%, 0805 Res., Chip, 34.8Ω, 1%, 0805 Res., Chip, 46.4Ω, 1%, 0805 Res., Chip, 64.9Ω, 1%, 0805 Res., Chip, 118Ω, 1%, 0805 XFMR, Würth 749022016 IC, LT4275AIDD, DFN10DD

FAIRCHILD, FDMC86102 VISHAY, CRCW06030000Z0EA VISHAY, CRCW0603100KJNEA VISHAY, CRCW080510K0FKEA VISHAY, CRCW0805140RFKEA VISHAY, CRCW080576R8FKEA VISHAY, CRCW080549R9FKEA VISHAY, CRCW080534R8FKEA VISHAY, CRCW080546R4FKEA VISHAY, CRCW080564R9FKEA VISHAY, CRCW0805118RFKEA WÜRTH, 749022016 LINEAR TECHNOLOGY, LT4275AIDD

Cap., OPT, 0402 Cap., OPT, 0603 Diode, OPT, SMA Diode, OPT, SOD-123 TP, OPT Trans., FDN8601, SOT23 Trans., OPT, SOT23 Res., 0603, OPT Res., 0805, Opt Varistor, Opt

OPT OPT OPT OPT OPT FAIRCHILD, FDN8601 OPT OPT OPT SANKOSHA, SD4-90, OPT

TDK, C2012X7R2A104K AVX, 08051C473KAT2A TDK, C4520X7R3D102K AVX, 08052C103KAZ2A DIODES INC., SMBJ58A-13-F DIODES INC., MMSZ5242BS FAIRCHILD, MMBD4148 FAIRCHILD, MMBT3904 FAIRCHILD, MMBT3906 VISHAY, CRCW06038R20JNEA VISHAY, CRCW06033K3JNEA VISHAY, CRCW0603100KJNEA VISHAY, CRCW0402100KJNEA VISHAY, CRCW04024K30JNEA VISHAY, CRCW04023K60JNEA VISHAY, CRCW060375R0JNEA FAIRCHILD, FDMQ8203

dc1788bfa

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DEMO MANUAL DC1788B parts list ITEM QTY REFERENCE Hardware for Demo Board Only 1 1 C4 2 1 CG2 3 1 D3 4 3 E1, E2, E4 5 1 E3 6 2 J1, J2 7 18 JP1-JP18 8 1 R11 9 1 RMPS1 10 4 RT5-RT8 11 1 1 1 C5 2 1 D1 3 1 D12 4 1 E3 5 2 E5, E6 6 1 Q2 7 2 Q7, Q8 8 1 R9 9 1 R10 10 2 R15, R22 11 1 R16 12 1 R32 13 1 R33 14 1 R42 15 1 RMPS1 16 1 T1 17 1 U1 Optional Circuit Components 1 0 C2 2 0 JP1-JP18 3 0 Q1 4 0 R17, R31 5 0 RC1-RC11 6 0 RV1-RV4 Hardware for Demo Board Only 1 1 C4 2 1 CG2 3 1 D3 4 3 E1, E2, E4 5 1 E3 6 2 J1, J2 7 18 JP1-JP18

PART DESCRIPTION

MANUFACTURER/PART NUMBER

Cap., 22µF, 100V, OS-CON Cap., X7R, 1nF, 2kV, 10%, 1808 LED, LN1351C-(TR), J-Type-LN1351CTR TP, Turret, 0.094" TP, Turret, 0.094" Conn., SS-7188S-A-NF HDR, 1x2 2mm, HD1X2-079 Res., Chip, 0Ω, 5%, 0603 Res., Chip, 5.1k, 5%, 2512 Res., Chip, 75Ω, 5%, 0603 Fab, Printed Circuit Board DC1788B-B BOM Cap., X5R, 0.1µF, 25V, 10%, 0603 Diode, B1100A, 100V, SMA Diode, 30V, Zener, SOD-123 TP, Turret, 0.094" TP, Turret, 0.094" Trans, FDN8601, SOT23 Trans, MMBTA42, 300V, SOT23 Res., Chip, 82.5k, 1%, 0603 Res., Chip, 20k, 1%, 0603 Res., Chip, 100k, 5%, 0603 Res., Chip, 34.8Ω, 1%, 0805 Res., Chip, 10k, 5%, 0805 Res., Chip, 56k, 5%, 0603 Res., Chip, 62k, 5%, 0402 Res., Chip, 4.7k, 5%, 2512 XFMR, Würth 749022017 IC, LT4275BIDD, DFN10DD

SUN ELECT., 100CE22BS TDK, C4520X7R3D102K PANASONIC, LN1351C-(TR) MILL-MAX, 2501-2-00-80-00-00-07-0 MILL-MAX, 2501-2-00-80-00-00-07-0 STEWART CONNECTOR, SS-7188S-A-NF SAMTEC, TMM-102-02-L-S VISHAY, CRCW06030000Z0EA VISHAY,CRCW25125K10JNEA VISHAY, CRCW060375R0JNEA DEMO CIRCUIT 1788B TDK, C1608X5R1E105K DIODES INC., B1100A CENTRAL SEMI, CMHZ5256B MILL-MAX, 2501-2-00-80-00-00-07-0 MILL-MAX, 2501-2-00-80-00-00-07-0 FAIRCHILD, FDN8601 FAIRCHILD, MMBTA42 VISHAY, CRCW060382K5FKEA VISHAY, CRCW060320KFKEA VISHAY, CRCW0603100KJNEA VISHAY, CRCW080534R8FKEA VISHAY, CRCW080510K0JNEA VISHAY, CRCW080556K0JNEA VISHAY, CRCW040262K0JNED VISHAY, CRCW25124K70JNEG WÜRTH, 749022017 LINEAR TECHNOLOGY, LT4275BIDD

Cap., OPT, 0402 HDR, 1x2 2mm, Opt Trans., Opt Res., 0805, Opt Res., 0805, Opt Varistor, Opt

OPT OPT OPT OPT OPT Sankosha, SD4-90, OPT

Cap., 22µF, 100V, OS-CON Cap., X7R, 1nF, 2KV, 10% 1808 LED, LN1351C-(TR), J-Type-LN1351CTR TP, Turret, 0.094" TP, Turret, 0.094" Conn., SS-7188S-A-NF HDR, 1x2 2mm, HD1X2-079

SUN ELECT., 100CE22BS TDK, C4520X7R3D102K PANASONIC, LN1351C-(TR) MILL-MAX, 2501-2-00-80-00-00-07-0 MILL-MAX, 2501-2-00-80-00-00-07-0 STEWART CONNECTOR, SS-7188S-A-NF SAMTEC, TMM-102-02-L-S dc1788bfa

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DEMO MANUAL DC1788B parts list ITEM 8 9 10 11

QTY 1 1 4 1

REFERENCE R11 RMPS1 RT5-RT8

1 1 C5 2 1 D1 3 1 D12 4 2 E5,E6 5 1 Q2 6 2 Q7,Q8 7 1 R9 8 1 R10 9 1 R22 10 1 R32 11 1 R33 12 1 R42 13 1 RC1 14 1 RC2 15 1 RC3 16 1 RMPS1 17 1 T1 18 1 U1 Optional Circuit Components 1 0 C2 2 0 E3 3 0 JP2, JP4, JP6, JP8, JP9-JP18 4 0 Q1 5 0 R15 6 0 R16, R17, R31 7 0 RC4-RC11 8 0 RV1-RV4 Hardware for Demo Board Only 1 1 C4 2 1 CG2 3 1 D3 4 3 E1, E2, E4 5 2 J1, J2 6 4 JP1, JP3, JP5, JP7 7 1 R11 8 1 RMPS1 9 4 RT5-RT8 10 1

PART DESCRIPTION Res., Chip, 0Ω, 5%, 0603 Res., Chip, 5.1k, 5%, 2512 Res., Chip, 75Ω, 5%, 0603 Fab, Printed Circuit Board DC1788B-C BOM Cap., X5R, 0.1µF, 25V, 10%, 0603 Diode, B1100A, 100V, SMA Diode, 30V Zener, SOD-123 TP, Turret, 0.094" Trans., FDN8601, SOT23 Trans., MMBTA42, 300V, SOT23 Res., Chip, 82.5k, 1%, 0603 Res., Chip, 20k, 1%, 0603 Res., Chip, 100k, 5%, 0603 Res., Chip, 10k, 5%, 0805 Res., Chip, 56k, 5%, 0603 Res., Chip, 62k, 5%, 0402 Res., Chip, 140Ω, 1%, 0805 Res., Chip, 76.8Ω, 1%, 0805 Res., Chip, 49.9Ω, 1%, 0805 Res., Chip, 4.3k, 5%, 2512 XFMR, Würth 749023015 IC, LT4275CIDD, DFN10DD

MANUFACTURER/PART NUMBER VISHAY, CRCW06030000Z0EA VISHAY, CRCW25125K10JNEA VISHAY, CRCW060375R0JNEA DEMO CIRCUIT 1788B TDK, C1608X5R1E105K DIODES INC., B1100A CENTRAL SEMI, CMHZ5256B MILL-MAX, 2501-2-00-80-00-00-07-0 FAIRCHILD, FDN8601 FAIRCHILD, MMBTA42 VISHAY, CRCW060382K5FKEA VISHAY, CRCW060320KFKEA VISHAY, CRCW0603100KJNEA VISHAY, CRCW080510K0JNEA VISHAY, CRCW060356K0JNEA VISHAY, CRCW040262K0JNED VISHAY, CRCW0805140RFKEA VISHAY, CRCW080576R8FKEA VISHAY, CRCW080549R9FKEA VISHAY, CRCW25124K30JNEA WÜRTH, 749023015 LINEAR TECHNOLOGY, LT4275CIDD

Cap., OPT, 0402 TP, Turret, 0.094", Opt HDR, 1x2 2mm, Opt Trans., Opt Res., 0603, Opt Res., 0805, Opt Res., Opt Varistor, Opt

OPT OPT OPT OPT OPT OPT OPT SANKOSHA, SD4-90, OPT

Cap., 22µF, 100V, OS-CON Cap., X7R, 1nF, 2KV, 10% 1808 LED, LN1351C-(TR), J-Type-LN1351CTR TP, Turret, 0.094" Conn., SS-7188S-A-NF HDR, 1x2 2mm Res., Chip, 0Ω, 5%, 0603 Res., Chip, 5.1k, 5%, 2512 Res., Chip, 75Ω, 5%, 0603 Fab, Printed Circuit Board

SUN ELECT., 100CE22BS TDK, C4520X7R3D102K PANASONIC, LN1351C-(TR) MILL-MAX, 2501-2-00-80-00-00-07-0 STEWART CONNECTOR, SS-7188S-A-NF SAMTEC, TMM-102-02-L-S VISHAY, CRCW06030000Z0EA VISHAY, CRCW25125K10JNEA VISHAY, CRCW060375R0JNEA DEMO CIRCUIT 1788B

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RV1 SD4-90 OPT

RV2 SD4-90 OPT

RT2 75

R10*

R9 * 1%

C2 OPT 0402

1. ALL RESISTORS AND CAPACITORS ARE 0603 2. ALL RESISTORS TOLERANCE RATING ARE 5% * SEE OPTION TABLES ON SHEET 2

5

RT3 75

22 24 23

19 21 20

16 18 17

RT4 75

XTX X+

XTX X+

XTX X+

XTX X+

*

4

R16 * RCLS 0805 1%

0.1uF 100V 0805

C1

CG1 1000pF 1808 2KV

3

2

1

R17 RCLS++ OPT 0805 1%

5

2

GND

RCLASS++

RCLASS

AUX

U1*

D1*

RT5 75

IEEUVLO

12 D- 10 TD 11 D+ 9 D- 7 TD 8 D+ 6 D- 4 TD 5 D+ 3 D- 1 TD 2 D+

RCLASS++4

RCLASS

R11 0

CT1 CT2 CT3 CT4 RV4 0.01uF 0.01uF 0.01uF 0.01uF SD4-90 200V 200V 200V 200V 0805 0805 0805 0805 OPT

D2 SMBJ58A

RV3 SD4-90 OPT

RT1 75

NOTE 1: UNLESS OTHERWISE SPECIFIED

AUX-

E6*

VPORTN

VPORTP

E5*

AUX+

AUX+ 37V - 57V

SPARE2

SPARE1

DATA2

DATA1

SS-7188S-A-NF

1 2 3 4 5 6 7 8

13 15 14

T1

1

RT7 75

Q2

TP4 TP5

8 7 6 5

Q1*

2

TP3

*

C3 47nF X7R 100V 0805

R13 3.3K

3 2 1

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 3

JUMPER SELECTIONS

__

ECO 1

REV

0 1 2 3 4 4 *** 4 *** 4 *** 4 ***

A,C A,C A,C A A A A A

JP6 JP8

JP3 JP5 JP7 JP9 JP11 JP13 JP15 JP17

3.84W 6.49W 13W 25.5W 38.7W 52.7W 70W 90W JP18

JP16

JP14

JP12

JP10

JP4

JP1

13W

JP2

POE POWER CLASS CLASS ++ CLASS

A,C

ASSY

2

R15*

SCALE = NONE 2

KAUNG H.

KAUNG H.

+

E2

E3*

E4

C4 22uF 100V

DATE:

N/A

SIZE

RC3**

0805 1%

RC10**

0805 1%

RC8**

0805 1%

RC6**

0805 1%

RC4**

0805 1%

TECHNOLOGY

VOUT-

RC2**

0805 1%

PWRGD

T2P

RC1**

KAUNG H.

1% 0805

RC11**

1% 0805

RC9**

RC7**

1% 0805

1% 0805

JP18**

JP16**

JP14**

JP12**

JP10**

JP8 **

JP6**

JP4 **

1

LT4275XIDD DEMO CIRCUIT 1788B Wednesday, February 06, 2013

IC NO.

TP2

SHEET 1

1

OF 2

REV.

1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only

JP17**

JP15**

JP13**

JP11**

JP9**

JP7**

JP5 **

JP3 **

RC5**

DATE 01-07-13

APPROVED

RCLASS JUMPERS JP1** JP2 ** 0805 1%

VOUT+

TP1

DESCRIPTION PRODUCTION

1

REVISION HISTORY

LTPOE + + POWERED DEVICE

TITLE: SCHEMATIC

PANASONIC

LN1351C-(TR)

D3

APPROVALS

R14 100K

RMPS * 1W 2512

E1

LTPOE + + PD WILL BE CLASSIFIED AS CLASS 4 BY AN IEEE 802.3 AT COMPLIANT PSE.

***AN

SS-7188S-A-NF

OUT TO PHY

CUSTOMER NOTICE

6

7

8

9

10

3

RT8 75

1 2 3 4 5 6 7 8

J2

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

T2P

PWRGD

HSSRC

HSGATE

VPORT

R12 8.2

CG2 1000pF 1808 2KV

RT6 75

3

VPORTN

A

B

C

D

IN FROM LTPOE++ PSE 37V-57V

9

10

J1

1

2

4

GND

1

9 10 4

RCLASS

11

1

14 RCLASS++

2

5

A

B

C

D

DEMO MANUAL DC1788B

Schematic Diagram

dc1788bfa

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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

A

B

C

V2

V2

1

D17 MMSZ5242BS

U2-1 FDMQ8203

D13 MMBD4148

R34 4.3K

R23 4.3K

1

D8 MMBD4148

MMSZ5242BS

D4

U2-2 FDMQ8203

DATA1

DATA2

R43 100K

Q9 MMBT3906

R35 3.6K

R24 3.6K

Q3 MMBT3904

R18 100K

** OPT STUFF

-B -C

D18 MMSZ5242BS

5

1. ALL RESISTORS ARE 0402 2. ALL RESISTORS TOLERANCE RATING ARE 5%

1

4

U2-4 FDMQ8203

D14 MMBD4148

R36 4.3K

R25 4.3K

1

D9 MMBD4148

MMSZ5242BS

D5

U2-3 FDMQ8203

DATA2

STUFF

-A OPT

OPT

STUFF

*

R31 0805

SPARE1

R44 100K

Q10 MMBT3906

R37 3.6K

R26 3.6K

Q4 MMBT3904

R19 100K

1

D19 MMSZ5242BS

R20 100K

R28 3.6K

1

R30 3.6K

D20 MMSZ5242BS

Q12 MMBT3906

0805 R41 3.6K

3

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

1

SCALE = NONE 2

KAUNG H.

KAUNG H.

APPROVALS

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

CUSTOMER NOTICE

*

R32

Q7*

Q6 MMBT3904

U3-4 FDMQ8203

D16 MMBD4148

R40 4.3K

R29 4.3K

1

D11 MMBD4148

MMSZ5242BS

D7

U3-3 FDMQ8203

SPARE2

R45 100K

Q11 MMBT3906

R39 3.6K

Q5 MMBT3904

U3-1 FDMQ8203

D15 MMBD4148

R38 4.3K

R27 4.3K

1

D10 MMBD4148

MMSZ5242BS

D6

U3-2 FDMQ8203

SPARE2

76.8 49.9 OPT OPT OPT OPT OPT OPT OPT OPT

OPT

SPARE1

OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT

OPT 140

140 76.8 49.9 34.8 34.8 140 46.4 76.8 64.9 49.9 118

STUFF

2

R46 100K

4.3K

R21 100K

4.7K

56K OPT 62K

OPT OPT 100K 10K

FDN8601 MMBTA42 0.1uF 82.5K 20K

OPT

0

5.1K

OPT OPT

RMPS1

R15 R16 R22 R32 R33 R31 R42

3

R10 100K OPT OPT OPT OPT 10K OPT

OPT

OPT

R9

FDN8601 MMBTA42 0.1uF 82.5K 20K 100K 34.8 100K 10K 56K OPT 62K

FDMC86102

C5

OPT

Q7, Q8

Q2

Q1

ASSY JP1,3,5,7 JP2,4,6,8 JP9-JP18 RC1 RC2 RC3 RC4 RC5 RC6 RC7 RC8 RC9 RC10 RC11

NOTE 2: UNLESS OTHERWISE SPECIFIED

DATA1

V1

V1

DATA1

DATA2

SPARE1

SPARE2

CMHZ5256B

OPT STUFF STUFF 749023015 B1100A

LT4275CIDD

OPT

-C

OPT CMHZ5256B

749022016

OPT

STUFF OPT

4

STUFF STUFF STUFF 749022017 B1100A

D12

LT4275BIDD

D1

LT4275AIDD

T1

7

E6

-B

E5

5

-A

E3

5

D

*

1

2

1

3

1

13

2

14

5

D1_2

13

2

14

D1_2

3

6

S2

G2

4

2

S2

N-CH

3

1

G1

S1

3

1 2 1 3 1 13 2

7

U1

16

S1

2

15 D3_4 3 2 D3_4

S3

G4

6

S2

8

S3 G3 9 2 3 12 N-CH

S4 11

S4

10

1 2 1 3 1 13 2

1 2 1 3

D1_2 3 2 13

S2

2

15 D3_4 3

G2 4 D1_2

3 1 G1 S1 3

N-CH

S1

2

1 13 2

2

G4 S4

2 16

S3

8

S3 G3 9 D3_4

3 12

S4 11

P-CH

10

P-CH

3

P-CH

2

P-CH N-CH

ASSY

Q8*

DATE:

N/A

SIZE

2

D12*

1

AUX

LT4275XIDD DEMO CIRCUIT 1788B 1

SHEET 2

1

OF 2

REV.

1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only

VPORTN

AUX+

LTPOE + + POWERED DEVICE

TECHNOLOGY

R42 *

0603

R33*

Wednesday, February 06, 2013

IC NO.

TITLE: SCHEMATIC

*

C5 25V 0603

R22 * 0603

VPORTP

VPORTP

1

A

B

C

D

DEMO MANUAL DC1788B

Schematic Diagram

dc1788bfa

15

DEMO MANUAL DC1788B 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 application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035

Copyright © 2004, Linear Technology Corporation

dc1788bfa

16 Linear Technology Corporation

LT 0313 REV A • PRINTED IN USA

1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900



FAX: (408) 434-0507 ● www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2012

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