Performance Summary; Quick Start Procedure - Linear Technology DC1472A Demo Manual

DEMO MANUAL DC1472A

PERFORMANCE SUMMARY

PARAMETER
Input Voltage Range
Jumper Selectable Output Voltage, V
Maximum Continuous Output Current
Default Operating Frequency
External Clock Sync. Frequency Range
Effi ciency

QUICK START PROCEDURE

Demonstration circuit 1472 is easy to set up to evaluate the
performance of the LTM4618EV. Please refer to Figure 1
for proper measurement equipment setup and follow the
procedure below.
1. With power off, connect the input power supply, load
and meters as shown in Figure 1. Preset the load to 0A
and V supply to be 0V. Place jumpers in the following
IN
positions for a typical 1.5V
JP6
V Select
OUT
1.5V
2. Turn on the power at the input. Increase V
(Caution: Do not hot plug the input supply or apply
more than the rated maximum voltage of 26.5V to the
board or the part may be damaged).
3. Set the RUN pin jumper (JP4) to the on position. The
output voltage should rise to 1.5V. The output voltage
meter should read the selected output voltage ±2%.
4. Vary the input voltage from 6V to 24V and adjust the
load current from 0A to 6A. The output voltage meter
should read the selected output voltage ±2%. Set the
input voltage to 12V and the load current to 6A.
2
Arrow.com. Arrow.com.
Downloaded from Downloaded from
CONDITIONS/NOTES
V = 4.5V – 26.5V, I
OUT IN
Derating is Necessary for Certain Operating Conditions.
See Data Sheet for Details
R3 = 10kΩ, R4 = 3.16kΩ
V = 12V, V
IN
application:
OUT
JP3 JP4
MODE RUN
CCM OFF
= 0A – 6A
OUT
= 2.5V, I = 6A
OUT OUT
5. Measure the output voltage ripple at J5 with a BNC
cable and oscilloscope.
6. To set the output voltage to 5V, turn off the input supply
power, apply the following changes listed below and
repeat steps 2 to 5:
JP10
V Select
OUT
5V
JP2
7. Set the load current to 0A. Set the RUN pin jumper
TRACK/SS
(JP4) to the OFF position. Power off the input supply.
SS
8. For load transient tests, apply an adjustable positive pulse
to 12V
IN
signal between IOSTEP CLK and GND test points. The
pulse amplitude sets the load step current amplitude.
The pulse width should be short (<1ms) and pulse duty
cycle should be low (<15%) to limit the thermal stress
on the load transient circuit. The load step current can
be monitored with a BNC connected to J6 (10mV/A).
VALUE
4.5V to 26.5V
1.2V, 1.5V, 1.8V, 2.5V, 3.3V or 5V ±2%
6A
DC
500kHz
250kHz to 750kHz
88.7% See Figure 2
JP3 JP4
MODE RUN
CCM OFF
JP2
TRACK/SS
SS
dc1472af