Linear Technology DC1775A Demo Manual page 2

DEMO MANUAL DC1775A
QUICK START PROCEDURE
IMPORTANT NOTE TO CUSTOMERS:
HIGH VOLTAGES ARE PRESENTED ON THE DEMO
CIRCUIT, AND CAN LEAD TO LETHAL INJURIES TO
HUMAN BODY. ONLY QUALIFIED PERSONNEL SHOULD
OPERATE IT. IT IS STRONGLY RECOMMENDED TO USE
SAFETY GLASSES AND AN ISOLATION TRANSFORMER.
NOTE. IMPROPER COMPONENTS REPLACEMENT ON
THE DEMO CIRCUIT CAN CAUSE PERFORMANCE DE-
TERIORATIONS, CIRCUIT MALFUNCTION, PROPERTY
DAMAGE, AND EVEN LIFE-THREATENING INJURIES.
CONTACT LINEAR TECHNOLOGY APPLICATIONS EN-
GINEERS FOR PROPER COMPONENT REPLACEMENT.
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Demonstration circuit 1775A is easy to set up to evalu-
ate the performance of the LT3799. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below:
1. Connect a 0.5A LED string with forward voltage less
than 30V, but greater than 20V, between LED
terminals.
2. With power off, connect the input power supply to line
(L) input and neutral (N) input.
3. Turn on the power at the input.
Note: Make sure that the input voltage does not exceed
the maximum input voltage (270VAC).
4. Check for the proper output current.
Once the proper output current is established, adjust the
input voltage and/or the load and observe the output current
regulation, efficiency, power factor and other parameters.
Figure 1. Proper Measurement Equipment Setup
+ –
and LED
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