Datasheet

2
dc1693afa
DEMO MANUAL DC1693A
qUick stArt proceDUre
Figure 1. V
OUT
Typical Maximum Output Current vs V
IN
Figure 2. V
OUT
Output Noise Spectrum with I
OUT
at 100mA and V
IN
at 12V
Demo circuit 1693A is an easy way to evaluate the per-
formance of the LTM8047. Refer to Figure 3 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 V
IN
or
V
OUT
and GND terminals. See Figure 4 for proper scope
probe technique.
1. With power off, connect the input power supply to V
IN
and GND.
2. Turn on the power at the input.
NOTE: Make sure that the input voltage does not exceed 30V.
3. Check for the proper output voltage between V
OUT
and
V
OUT
–
.
NOTE: If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
4. Once the proper output voltage is established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
V
IN
(V)
4
0
OUTPUT CURRENT (mA)
300
250
200
150
100
50
500
350
400
450
6 16 18 20 22 24 26 28 308 10 12
dc1693a F01
14
FREQUENCY (MHz)
0
–120
INTENSITY (dBm)
–20
–40
–60
–80
–100
0
0.5 3 3.5 4 4.5 51 1.5 2
dc1693 F02
2.5