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dc1588af
DEMO MANUAL DC1588A
QUICK START PROCEDURE
Figure 1. Test Setup of DC1588A
Demonstration circuit 1588A is easy to set up to evalu-
ate the performance of the LTM4611EV. Please refer to
Figure 1 for proper measurement equipment setup and
follow the procedure below:
1. Place jumpers in the following positions for a typical
1.8V
OUT
application:
JP4
JP1
JP2
JP3
V
OUT
SELECT
RUN
MODE/PLLIN
TRACK/SS
1.8V
ON
FCM
SS
2. With power off, connect the input power supply, load
and meters as shown in Figure 1. Preset the load to
0A and V
IN
supply to be 5V.
3. Turn on the power supply at the input. The output volt-
age should be 1.8V ± 1.5%.
4. Once the proper output voltage is established, adjust the
load within the operating range and observe the output
voltage regulation, output voltage ripple, effi ciency and
other parameters. Output ripple should be measured
at J5 with a BNC cable.
5. To perform a load transient test, apply a square-wave
pulse signal between IOSTEP_CLK and GND pins. The
pulse amplitude (3V ~ 3.5V) sets the amplitude of load
current step. The pulse signal should have very small
duty cycle (<10%) to limit the thermal stress on the
transient load circuit. The output transient current can
be monitored at BNC connector J6 (15mV/A).
6. The LTM4611 can be synchronized to an external clock
signal. Place the jumper JP2 in the EXTCLK position
and apply the clock signal on the “CLKIN” (TP17) test
point.
7. The output of LTM4611 can track another supply. The
jumper JP3 allows selection of the soft-start or output
tracking feature. If tracking external voltage is selected,
the corresponding test point, “TRACK” (TP7), needs to
be connected to a valid reference voltage signal.
+
V
IN
1.5V TO 5.5V
A
+
–
V
–
+
V
–
+
A
–
+
LOAD
0A TO 15A
DC1588A F01
