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dc2359afb
DEMO MANUAL DC2359A
Quick start proceDure
Demonstration circuit 2359A is easy to set up to evaluate
the performance of the LTC3624HMSE. 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
5V output application:
Table 1. Typical 5V Output Voltage Jumper Selection
JP1
JP2
JP7
RUN
MODE/SYNC
V
OUT
ON
BM
5.0V
2. With power off, connect the input power supply at
V
IN
(E1) and GND (E2)
3. Connect the Load between V
OUT
(E8) and GND (E9).
Preset the load to 0A.
4. Connect the DMMs to the input and output to monitor
the input voltage and output voltage.
5. Turn on the power supply at the input. The RUN pin
jumper should be at “ON” position. Measure and make
sure the input supply voltage is 12V. The output voltage
should be 5V ±2%.
6. Once the input and output voltages are properly es-
tablished, adjust the loads within the operating range
(0A to 2A Max) and observe the output voltage regula-
tion, output voltage ripple, switch node waveform and
other parameters. Refer to Figure 2 for proper output
voltage ripple measurement.
7. To select other output voltages, use the on board user
selectable output voltage jumpers. Shutting down
LTC3624HMSE by placing RUN pin jumper (JP1) to the
OFF position or turn off the input power supply. Refer
to the following table (Table 2) for the output voltage
selection and repeat step 2 to 6.
Table 2. Output Voltage Jumper Selection
JP3
JP4
JP5
JP6
JP7
JP8*
1.2V
1.8V
2.5V
3.3V
5V
User Select
*If JP8 is selected, R6 needs to be calculated and inserted to obtain the
desired output voltage.
NOTE 1: To measure the input/output voltage ripple prop-
erly, do not use the long ground lead on the oscilloscope
probe. See Figure 2 for the proper scope probe technique.
Short, stiff leads need to be soldered to the (+) and (–)
terminals of an output capacitor. The probe’s ground ring
needs to touch the (–) lead and the probe tip needs to
touch the (+) lead.
NOTE 2: The DC2359A can also be used to evaluate the
LTC3624HMSE-2 (2.25MHz) by simply replacing U1 with
the LTC3624HMSE-2 and changing inductor L1 to 1.5µH
(Coilcraft XAL4020-152ME).
