Quick Start Procedure - Linear Technology DC2541A Demo Manual

DEMO MANUAL DC2541A

Quick start proceDure

Demonstration circuit 2541A is easy to set up for evaluat-
ing the performance of the LTC4279. Refer to Figure 1 for
proper measurement equipment setup, Table 1 for jumper
and supply settings, and follow the procedure below.
1) Select the evaluation PSE Type as shown in Table 1 and
set the jumpers accordingly.
2) Connect a power supply with the positive to AGND (J3)
and negative to VEE (J4).
3) Ramp up the supply to the recommended values speci-
fied in Table 1 for the configured mode. VEE LED1 will
turn on when the board is powered.
Table 1. Example Jumper Settings and VEE Supply Range for the Various PSE Types (Note 1)
POWER MODE
PSE TYPE (JP6)
IEEE 802.3at Type 1 TYPE 1 (13W)
(13W)
Legacy TYPE 1 (13W)
IEEE 802.3at Type 2 TYPE 2 (25.5W)
(25.5W)
LTPoE ++ (38.7W) LTPoE ++ (38.7W)
LTPoE ++ (52.7W) LTPoE ++ (52.7W)
LTPoE ++ (52.7W)
Dual PD
LTPoE ++ (70W) LTPoE ++ (70W)
LTPoE ++ (90W) LTPoE ++ (90W)
Note 1: The application is not limited to these settings. See the LTC4279 data sheet pin descriptions.
2
4) Connect test measurement probes across VPORT+
5) Connect a PD with a Cat5e Ethernet cable to RJ45
6) Connect a 10BASE-T, 100BASE-T or 1000BASE-T PHY
PORT+ (JP1)/ MID
PORT– (JP2) (JP3)
2-PAIR LO/HI
2-PAIR LO/HI
2-PAIR LO/HI
4-PAIR LO/HI
4-PAIR LO/HI
4-PAIR LO/HI
4-PAIR LO/HI
4-PAIR LO/HI
and VPORT– for 2-pair measurements, and optionally
additional test measurement probes across DATA2+
and DATA2– for 4-pair measurements.
connector J1. PORT PWR LED2 will turn on if the port
power is on.
data source with an Ethernet cable to J2 for data testing
(optional).
DUALPD
(JP4)
LO
LO
LO
LO
LO
HI
LO
LO
LEGACY
(JP5) MAIN PS
LO 45V to 57V
HI 48V (Typical)
LO 51V to 57V
LO 51V to 57V
LO 51V to 57V
LO 51V to 57V
LO 54.75V to 57V
LO 54.75V to 57V
dc2541af