LT3957
2
QUICK START PROCEDURE
Demonstration circuit 1544 is easy to set up to evaluate
the performance of the LT3957. Refer to Figure 2 for
proper measurement equipment setup and follow the
procedure below:
NOTE.
When measuring the input or output voltage ripple, care must be
taken to avoid a long ground lead on the oscilloscope probe. Measure the
input or output voltage ripple by touching the probe tip directly across the
Vin or Vout and GND terminals.
1.
Place jumpers in the following positions:
NO SYNC
2.
With power off, connect the input power supply to
VIN and GND.
NOTE.
Connect power to GND, not SGND.
3.
Connect a load of 600mA or less to VOUT and GND
terminals (not SGND).
4.
Turn on the power at the input.
NOTE.
Make sure that the input voltage does not exceed 20V.
5.
Check for the proper output voltage (24V).
NOTE.
If there is no output, temporarily disconnect the load to make
sure that the load is not set too high.
6.
Once the proper output voltage is established, adjust
the load and input within the operating ranges and
observe the output voltage regulation, ripple voltage,
efficiency and other parameters.
Figure 2.
Proper Measurement Equipment Setup
JP1
