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dc2453afb
DEMO MANUAL DC2453A
Quick start proceDure
Demonstration circuit 2453A is an easy way to evaluate the
performance of the LTM4643EV. Please refer to Figure 1
for test setup connections and follow the procedure below.
1. With power off, place the jumpers in the following
positions:
JP1
JP2
JP3
JP2
RUN1
RUN2
RUN3
RUN4
ON
ON
ON
ON
JP8
JP7
JP6
JP5
MODE1
MODE2
MODE3
MODE4
CCM
CCM
CCM
CCM
2. Before connecting input supply, loads and meters, preset
the input voltage supply to be between 4V to 20V. Preset
the load currents to 0A.
3. With power off, connect the loads, input voltage supply
and meters as shown in Figure 1.
4. Turn on input power supply. The output voltage meters
for each phase should display the programmed output
voltage ±2%.
5. Once the proper output voltage is established, adjust the
load currents for each phase within the 0A to 3A range
and observe the load regulation, efficiency, and other
parameters. Output voltage ripple should be measured
at J6 with a BNC cable and oscilloscope.
6. To observe increased light load efficiency place, a Mode
pin jumper (JP5-JP8) in the DCM Mode position.
performance summary
PARAMETER
CONDITIONS/NOTES
VALUE
Input Voltage Range
4V – 20V
Output Voltage V
OUT
Jumper Selectable
V
OUT1
= 3.3VDC, V
OUT2
= 2.5VDC, V
OUT3
=
1.5VDC, V
OUT4
= 1.2VDC
Maximum Continuous Output Current per Phase
Derating is Necessary for Certain Operating
Conditions. See Data Sheet for Details
3ADC
Default Operating Frequency
1.2MHz
Efficiency
V
IN
= 12V, V
OUT1
= 3.3V, I
OUT
= 3A
89% See Figure 2
