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Linear Technology DC1842A Demo Manual
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Linear Technology DC1842A Demo Manual

Ltc4290b/ltc4271 8-port pse with digital isolation
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DESCRIPTION
Demonstration kit DC1843A is an 8-port Type 2 power
sourcing equipment (PSE) composed of a DC1842A
daughter card and DC1680A motherboard. The kit is used
for evaluation of the LTC4290B and LTC4271 PSE chipset.
Up to 8 powered devices (PDs) can be connected and
powered from this system using a single power supply.
A DC590 is connected to the DC1680A for I
with QuikEval™. This demonstration manual provides a
Quick Start Procedure, a DC1842A overview, a DC1680A
BOARD PHOTO
DEMO MANUAL DC1843A
DC1842A and DC1680A
8-Port PSE with Digital Isolation
overview, schematics, BOMs, and layout printouts. Refer
to the Layout Guide for Demonstration Circuit 1842A when
laying out the LTC4290B/LTC4271 circuit. Contact Linear
Technology for this document.
Design files for this circuit board are available at
http://www.linear.com/demo
2
C interfacing
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
LTC4290B/LTC4271
dc1843af
1

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Summary of Contents for Linear Technology DC1842A

  • Page 1 A DC590 is connected to the DC1680A for I C interfacing L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and with QuikEval™. This demonstration manual provides a QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property Quick Start Procedure, a DC1842A overview, a DC1680A of their respective owners.

  • Page 2: Quick Start Procedure

    QUICK START PROCEDURE Demonstration kit DC1843A includes the DC1842A 3. Align pin 1 of the 30-pin male connector on the DC1842A daughter card and DC1680A motherboard. The kit is set with pin 1 of the 30-pin female connector on the up for evaluating the LTC4290B/LTC4271.
  • Page 3 DEMO MANUAL DC1843A QUICK START PROCEDURE Figure 3. DC1680A Basic Setup Figure 4. DC1843A System Setup with the DC590, DC1680A, DC1842A and 55V Power Supply dc1843af...
  • Page 4 Also connected at J1 is the PoE V supply from the quick shutdown of preselected ports. PD discovery uses a motherboard and 8 PSE controlled outputs. Figure 5. DC1842A 8-Port PSE Daughter Card with Digital Isolation Features the LTC4290B and LTC4271 dc1843af...
  • Page 5 1842A document when laying out the board. supply for V and an isolated V supply are connected Contact Linear Technology Corporation for this document. to the DC1842A through the 30-pin connector. 30-PIN CONNECTOR DD33 DC1842A SIDE DC1680A SIDE SUPPLY –...
  • Page 6 AD6, AD3, AD2, AD1, and AD0 pins J2, PIN 10 XIO0 respectively. On the DC1842A, AD0 and AD1 are tied low with pull-down resistors. AD2, AD3 and AD6 are brought DC1843A F08 out to the 30-pin connector (Figure 7) and set with three switches on the DC1680A.
  • Page 7 AGND LTC4290 1μF SMAJ58A 100V PROTECTION VSSK SENSEn GATEn OUTn 0.22μF 100V RSENSEn 0.1μF B1100 OUTn OUTn PORT FDMC3612 4 × 1.00 DC1843A F11 Figure 11. DC1842A, 1 of 8 Port Outputs. S1B Protection Diodes Located on the DC1680A dc1843af...
  • Page 8 J1 to block off the unused pins when the DC1843A kit. This board accepts various PSE daughter the DC1842A daughter card is inserted. cards featuring Linear Technology PSE controllers. The DC1680A is capable of powering up to 8 PDs.
  • Page 9 DEMO MANUAL DC1843A DEMONSTRATION CIRCUIT 1680A OPERATION MSD and RESET Pushbuttons Pushbutton switch SW2 when pressed pulls the maskable shutdown input (MSD) pin of the daughter card logic low. Pushbutton switch SW1, when pressed, pulls the RESET When pressed, all ports that have their corresponding mask pin of the daughter card logic low.
  • Page 10 A red LED indicates when the INT line is pulled logic low Figure 14 shows a basic DC1680A system setup. The by the daughter card. When the interrupt is cleared (high) DC1842A daughter card is inserted in the 30-pin connec- via I C servicing, the LED is turned off.
  • Page 11 DEMO MANUAL DC1843A DEMONSTRATION CIRCUIT 1680A OPERATION Figure 14. DC1680A and DC1842A System Setup with Power Supply, DC590 and PD Demo Board dc1843af...
  • Page 12 DEMO MANUAL DC1843A DEMONSTRATION CIRCUIT 1842A LAYOUT Top Silkscreen Layer 1: Top Layer Layer 2: V Plane 1 dc1843af...
  • Page 13 DEMO MANUAL DC1843A DEMONSTRATION CIRCUIT 1842A LAYOUT Layer 3: V Plane 2 Layer 4: Bottom Layer Bottom Silkscreen dc1843af...
  • Page 14 DEMO MANUAL DC1843A DEMONSTRATION CIRCUIT 1680A LAYOUT Top Silkscreen dc1843af...
  • Page 15 DEMO MANUAL DC1843A DEMONSTRATION CIRCUIT 1680A LAYOUT Layer 1: Top Layer dc1843af...
  • Page 16 DEMO MANUAL DC1843A DEMONSTRATION CIRCUIT 1680A LAYOUT Layer 2: AGND, CGND Plane 1 dc1843af...
  • Page 17 DEMO MANUAL DC1843A DEMONSTRATION CIRCUIT 1680A LAYOUT Layer 3: SIG, AGND, CGND Plane 2 dc1843af...
  • Page 18 DEMO MANUAL DC1843A DEMONSTRATION CIRCUIT 1680A LAYOUT Layer 4: SIG, AGND, CGND Plane 3 dc1843af...
  • Page 19 DEMO MANUAL DC1843A DEMONSTRATION CIRCUIT 1680A LAYOUT Layer 5: SIG, CGND, CGND Plane 4 dc1843af...
  • Page 20 DEMO MANUAL DC1843A DEMONSTRATION CIRCUIT 1680A LAYOUT Layer 6: Bottom Layer dc1843af...
  • Page 21 DEMO MANUAL DC1843A DEMONSTRATION CIRCUIT 1680A LAYOUT Bottom Silkscreen dc1843af...

  • Page 22: Parts List

    RES., CHIP, 12k, 1/4W, 5% 1206 TRANSFORMER, ETHERNET, 10/100 Midcom Würth, 7490100143 IC., Digital PSE Controller, 24-LEAD 4×4 QFN LINEAR TECH., LTC4271IUF IC., 8-Port PSE Controller, 40-LEAD 6×6 QFN LINEAR TECH., LTC4290BIUJ FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1842A STENCIL STENCIL DC1842A dc1843af...
  • Page 23 DEMO MANUAL DC1843A PARTS LIST DC1680A ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components J7, J8 JACK BANANA KEYSTONE, 575-4 CAP, ALUM, 47μF, 100V H13 size PANASONIC, EEEFK2A470AQ C2, C13, C14 CAP, X7R, 0.1μF 25V, 10% 0603 AVX, 06033C104KAT2A C3, C11, C12 CAP, X7R, 1μF 16V, 10% 0603 TDK, C1608X7R1C105K...
  • Page 24 STAND-OFF, NYLON 0.75" KEYSTONE, 8834 (SNAP ON) DC1843A Kit ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1842A DC1842A, LTC4290B/LTC4271, Daughter Card LINEAR TECH., DC1842A DC1680A DC1680A, 12-Port PSE Motherboard LINEAR TECH., DC1680A J1-J8 RJ45 Dust Cap, Plastic, Grey Amphenol, FRJ2411 Connector Porization Pin-J1 Pin 31-34...
  • Page 25 DEMO MANUAL DC1843A DC1842A SCHEMATIC DIAGRAM 2mm, 30 Pin Connector dc1843af...
  • Page 26 DEMO MANUAL DC1843A DC1680A SCHEMATIC DIAGRAM dc1843af...
  • Page 27 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.
  • Page 28 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.

This manual is also suitable for:

Dc1680a