Linear Technology DC2393A Demo Manual page 2

DEMO MANUAL DC2393A
QUICK START PROCEDURE
Demonstration circuit 2393A is easy to set up to evalu-
ate the performance of the LT8304. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below:
1. With power off, connect the input power supply to the
board through V (E1) and GND (E2) terminals. Connect
IN
the load to the terminals V
the board.
2. Turn on the power at the input. Increase V
to 18V.
Note: Make sure that the input voltage is always within
spec. To operate the board with higher input/output
voltage, input capacitor, output capacitor and output
diode with higher voltage ratings are needed.
3. Check for the proper output voltages. The output should
be regulated at 5.0V (±5%).
2
+ –
(E3) and V (E4) on
OUT OUT
slowly
IN
Figure 1. Proper Measurement Equipment Setup
Note: The LT8304 requires very small minimum load
to maintain good output voltage regulation. A Zener
diode is placed on the output to clamp the voltage to
5.6V. This Zener can be replaced with a 249Ω resistor
at the trade off of lower efficiency.
4. Once the proper output voltage is established, adjust
the input voltage and load current within the operating
range and observe the output voltage regulation, ripple
voltage, efficiency and other parameters.
NOTE: When measuring the input or output voltage ripples,
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 V
+
and GND (E2), or V
OUT
See Figure 2 for proper scope probe technique.
–
(E3) and V (E4) terminals.
OUT
(E1)
IN
dc2393af