Quick Start Procedure - Linear Technology DC1145B Demo Manual

QUICK START PROCEDURE

Demonstration circuit 1145B is easy to set up to evaluate
the performance of the LTC4267. For proper equipment
setup, refer to Figure 1 and follow the procedure below:
1. Apply an initial load of 100mA at V
2. Connect a PoE compliant Power Sourcing Equipment
(PSE) to RJ45 connector J1.
3. The PSE will detect and power up the PD. Verify output
voltage measures 12V.
4. If the PSE has status readout, verify the proper PD
power class 3 was detected.
5. In place of a PSE, the DC1145 board can be powered
by an alternate input power supply. Connect 48V
through the PoE + and PoE – terminals. Only one set of
RJ45 RJ45
PSE
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CABLE
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DEMO MANUAL DC1145B
connections is necessary. Do not connect more than
one power source.
6. Increase the load at V
.
output regulation, ripple voltage, efficiency and other
OUT
parameters
7. Measure PWRGD and SIGDISA relative to POE – . Verify
PWRGD is logic low and SIGDISA is logic low.
8. Connect a 12V auxiliary supply and verify V
the new supply.
9. Measure PWRGD and SIGDISA relative to POE – . Verify
PWRGD is logic high and SIGDISA is logic high.
10. Remove the 12V auxiliary supply and verify the PSE
power returns.
Figure 1. DC1145B Test Setup
up to 0.9A. Observe the
OUT
equals
OUT
A
+ –
+
V LOAD
–
dc1145bf
3
+
–