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Maxim > Design Support > Technical Documents > Reference Schematics > Power-Supply Circuits > APP 5815

Keywords: 4-20mA current loops, HVAC and building control, high-voltage LDO replacement, general-purpose point-of-load

REFERENCE SCHEMATIC 5815

Palo Verde (MAXREFDES33#): Step-Down Converter

Feb 27, 2014

Abstract:

The Palo Verde reference design (MAXREFDES33#) is a high-efficiency, high-voltage, synchronous step-down DC-

DC converter with integrated MOSFETs operating over a 4.5V to 60V input voltage range and delivering output current up to

300mA at 3.3V. Test results and hardware files provide complete documentation for designs. The board is also available for

purchase.

Introduction

The Palo Verde (MAXREFDES33#) subsystem

reference design (Figure 1) demonstrates the

application of the MAX15062A 60V, 300mA ultra-

small, high-efficiency, synchronous step-down

converter. The reference design operates over a wide

4.5V to 60V input voltage range, and provides up to

300mA at 3.3V output. The device features

undervoltage lockout, overcurrent protection, and

thermal shutdown. The MAX15062A switches at a

fixed frequency of 500kHz, and delivers a peak

efficiency of 86.77% with the supplied components

when the input is 24V. This general-purpose power

solution can be used in many different types of power applications, such as 4–20mA current loops, HVAC and building

control, high-voltage LDO replacement, general-purpose point-of-load, etc. In this reference design, the MAX15062 performs

in 24V input applications, such as industrial sensors, process control, etc.

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Summary of content (6 pages)

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Maxim > Design Support > Technical Documents > Reference Schematics > Power-Supply Circuits > APP 5815 Keywords: 4-20mA current loops, HVAC and building control, high-voltage LDO replacement, general-purpose point-of-load REFERENCE SCHEMATIC 5815 Palo Verde (MAXREFDES33#): Step-Down Converter Feb 27, 2014 Abstract: The Palo Verde reference design (MAXREFDES33#) is a high-efficiency, high-voltage, synchronous step-down DCDC converter with integrated MOSFETs operating over a 4.
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System Diagram Figure 1. Typical industrial control power system diagram.
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Quick Start Required equipment: Palo Verde (MAXREFDES33#) board One 24V, 1A minimum power supply that shows the output current One electronic load One voltmeter Procedure 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Turn off the power supply. Connect the positive terminal of the power supply to the VIN connector of the MAXREFDES33# board. Connect the negative terminal of the power supply to the GND connector of the MAXREFDES33# board.
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voltage at the VOUT pin. Figure 3. Output ripple at 0mA load. Figure 4. Output ripple at 300mA load. Figure 5 displays the load transient response when the load is stepped from 5mA to 150mA, and then dropped back to 5mA again.The transient voltage is about 60mV.
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Figure 5. Transient response when load steps from 5mA to 150mA. Figure 6 displays the load transient response when the load is stepped from 150mA to 300mA, and then dropped back to 150mA again.The transient voltage is also about 60mV. Figure 6. Transient response when load steps from 150mA to 300mA.
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PCB Gerber PCB CAD (For PADS V9.0 and later) Buy Reference Design Buy Direct: Palo Verde (MAXREFDES33#) Or Order the Palo Verde reference design (MAXREFDES33#) from your local Maxim representative. Pmod is a trademark of Digilent Inc. Related Parts MAX15062 60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters Free Samples More Information For Technical Support: http://www.maximintegrated.com/support For Samples: http://www.maximintegrated.