EV1570DN-00A 데이터 시트보기 (PDF) - Monolithic Power Systems

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EV1570DN-00A

3A, 23V, 340KHz Synchronous Step-Down Converter

Monolithic Power Systems 

EV1570DN-00A – 3A, 23V, 340KHz SYNCHRONOUS STEP-DOWN CONVERTER

EVALUATION BOARD – INITIAL RELEASE

QUICK START GUIDE

1. Connect the positive terminal of the load to VOUT pins, and the negative terminal of the load to

GND pins.

2. Preset power supply output to 4.75V to 23V and turn off the power supply.

3. Connect the positive terminal of the power supply output to VIN pin, and the negative terminal of

the power supply output to GND pin.

4. Turn power supply on and the MP1570 will automatically startup.

5. To use Enable function, apply a digital input to EN pin. Drive EN higher than 2.5V to turn on the

regulator, drive EN less than 0.7V to turn it off.

6. An under voltage lockout (UVLO) function can be implemented by the addition of a resistor

divider R4 and R5. The EN threshold is 2.5V, so VIN UVLO threshold is: ⎜⎛1+ R4 ⎟⎞ × 2.5V .

⎝ R5 ⎠

RECOMMENDED COMPONENTS FOR STANDARD OUTPUT VOLTAGES

The output voltage of this board is set to 3.3V. This board is laid out to accommodate most commonly

used inductors and output capacitors and to be programmed for most standard output voltages. The

following table lists recommended components for some standard output voltages. Listed

compensation components (R2, C3) values are based on the output capacitor installed on this board.

For other capacitors, refer to the Application Information section of the MP1570 datasheet..

VOUT

1.8V

2.5V

3.3V

5V

12V

R1

4.75kΩ

10.5kΩ

16.9kΩ

30.9kΩ

88.7kΩ

R2

5.6kΩ

4.7kΩ

5.6kΩ

7.5kΩ

10kΩ

C3

3.3nF

4.7nF

3.3nF

3.3nF

1.2nF

L1

4.7µH

4.7µH to 6.8µH

6.8µH to 10µH

10µH to 15µH

15µH to 22µH

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.

EV1570DN-00A Rev. 1.1

www.MonolithicPower.com

5

4/6/2005

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2005 MPS. All Rights Reserved.

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