MAXREFDES114 datasheet(5/10 Pages) MAXIM

5 / 10 page

VSTART = (R6 + R7 + R11)/(R6 + R7) × 1.21 (V)

VOVI = (R6 + R7 + R11)/R6 × 1.21 (V)

If R6 = 24kΩ, R7 = 30kΩ, and R11 = 680kΩ, then:

VSTART = 16.5V, VOVI = 37.0V.

These values give a safe margin for input-voltage range of 17V to 36V.

Quick Start Guide

Required Equipment:

•

MAXREFDES114#

•

One adjustable DC power supply with voltage output up to 37V and current up to 3A

•

One electronic load

•

Two voltmeters

•

Two ammeters

Procedure

The MAXREFDES114# board is fully assembled and tested. Use the following steps to verify board

operation.

1. Turn off the power supply.

2. Connect the positive terminal of the power supply to the VIN connector of the MAXREFDES114#

board.

3. Connect the PGND connector of the MAXREFDES114# board to the positive terminal of one

ammeter. Connect the negative terminal of the ammeter to the negative terminal of the power

supply.

4. Connect one voltmeter across the VIN and the PGND connectors of the MAXREFDES114#

board.

5. Connect the VOUT connector of the MAXREFDES114# board to the positive terminal of the

electronic load.

6. Connect the negative terminal of the electronic load to the positive terminal of the second

ammeter. Connect the negative terminal of the ammeter to the GNDO connector of the

MAXREFDES114# board.

7. Connect the second voltmeter across the VOUT and the GNDO connectors of the

MAXREFDES114# board.

8. Turn on the power supply. Set the output to 24V.

9. Set the electronic load to a constant current between 0A to 2A.

10. Verify the second voltmeter reading is 5V ±0.25V.

Lab Measurements

The MAXREFDES114# was verified and tested under full input range and different output load

conditions.

The power efficiency vs. load current is illustrated in Figure 2.

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