EV0020 Datasheet, PDF (4/4 Pages) Monolithic Power Systems – 2A, 32V, 330KHz Step-Down Converter

EV0020 (MP1591DN) – 2A, 32V, 330KHz STEP-DOWN CONVERTER
EVALUATION BOARD
QUICK START GUIDE
The output voltage of this board is set to 5V. The board layout accommodates most commonly used
inductors and output capacitors.
1. Attach the positive and negative ends of the load to VOUT and GND, respectively.
2. Attach the input voltage (6.5V ≤ V_IN ≤ 32V) and input ground to VIN and GND, respectively.
3. To enable to the MP1591, apply a voltage (V_EN ≥ 2V) to the EN pin. To disable it, connect the
EN pin to ground.
4. The REF pin outputs a 5V reference voltage. If used, a 0.01µF capacitor should be connected
from this pin to GND to reduce switching ripple. Leave unconnected if not used.
5. The output voltage V_OUT can be changed by varying R1. Calculate R1 using the formula:
R1
=
R3
×
⎜⎜⎝⎛
V_OUT
V_FB
− 1_{⎟⎟⎠⎞}
where V_FB = 1.23V and R3 is set at 15kΩ.
For example, for V_OUT = 5.0V:
R1
=
R3
×
⎜⎜⎝⎛
V_OUT
V_FB
−
1_{⎟⎟⎠⎞}
=
15kΩ
× ⎜⎛ ^5.0V
⎝ ^1.23V
− 1⎟⎞ = 45.98kΩ ≈ 47kΩ
⎠
standard 1% value.
See Maximum Duty Cycle limits to determine allowable output voltage range.
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.
EV0020 (MP1591DN) Rev. 1.5
www.MonolithicPower.com
4
12/21/2005
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