EV1542DK-SEPIC-00A Datasheet, PDF (4/4 Pages) Monolithic Power Systems – 700KHz/1.3MHz Boost Converter with a 2A Switch

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EV1542DK-SEPIC-00A — 700KHz/1.3MHz SEPIC CONVERTER WITH A 2A SWITCH
EVALUATION BOARD
QUICK START GUIDE
The output voltage of this board is set to 3.3V. The board layout accommodates most commonly used
inductors and output capacitors.
1. Preset the power supply to 3V ≤ V_IN ≤ 6V.
2. Turn the power supply off.
3. Connect the power supply terminals to:
a. Positive (+): VIN, EN
b. Negative (–): GND
4. Connect the load to:
a. Positive (+): VOUT
b. Negative (–): GND
5. Turn on the power supply after making connections.
6. The MP1542 is enabled on the evaluation board once V_IN is applied. To disable the MP1542,
disconnect EN from IN.
7. The output voltage V_OUT can be changed by varying R1. Calculate the new value using the
formula:
R1
=
⎜⎜⎝⎛
V_OUT
V_FB
− 1_{⎟⎟⎠⎞}R2
Where V_FB = 1.25V and R2 = 10kΩ
For example, for V_OUT = 5V
R1 = ⎜⎛ ^5V − 1⎟⎞ × 10kΩ = 30kΩ
⎝ ^1.25V ⎠
Therefore use a 30.1kΩ standard 1% value.
8. The switching frequency is set to 1.3MHz if jumper JP1 is shunted at the H position. To get
700KHz operation, shunt JP1 at the L position.
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
EV1542DK-SEPIC-00A Rev. 1.0
www.MonolithicPower.com
4
6/15/2005
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