High Efficiency Switching Dc Regulators



Introduction

Welcome to the CUI Product Spotlight on high efficiency switching regulators. Learn about the need to regulate voltage, industry applications, linear regulators vs. switching regulators, and CUI's available products.

Objectives

  • Introduce the CUI's switching regulator series and it's available configurations.
  • Describe key features and specifications.
  • Compare performance vs. comparable L78 linear regulators.
  • Describe typical applications.

The Need to Regulate Voltage


In many applications, the system's input voltage supply can be unstable or vary over a wide range. Because most loads in today's electronic equipment are sensitive and require tightly regulated voltages, a regulator is often used to convert and stabilize the source voltage. For many years, the prevailing means to achieve this regulation has been to use linear regulators. Though inexpensive, linear regulators are highly inefficient, leading to issues such as high power loss and temperature rise due to efficiency levels in the range of 40~60%. Using a switching topology, CUI's switching regulator series is able to achieve the same results in a much more efficient manner.

Linear vs. Switching Regulators

CUI's switching regulator series holds distinct advantages compared to the industry standard LM78XX series linear regulator. As previously highlighted, the switching regulators offer efficiency levels that are far superior. This, in turn, removes the need for a heat sink, making the modules a much more compact solution. The switching regulators include protective features that are not available in LM78XX series linear regulators. Additionally, CUI's switching regulators possess the ability to provide positive or negative output off of a positive voltage rail, allowing the series to address LM79XX applications, further increasing the series' flexibility.


 
  Switching Regulators Linear Regulators
Efficiency 84~96% 40~60%
Heatsink Needed No Yes
Short Circuit Protection Yes No
Over Temp protection Yes No
Negative Conversion Option Yes No

Applications

CUI's switching regulators are ideal for a wide range of applications across many industries. They can be used in equipment where high temperature is a concern, such as automotive electronics, railway, industrial sensing, and outdoor security. These modules are preferred over linear regulators where power consumption is a consideration. Typical application here would include infrared detectors, hand-held GPS devices, and portable communication equipment. Where ripple and noise is a concern, such as electrocardiography, spectrum therapy, weak signal detection, and processing equipment, the CUI's switching regulators are also ideal. Finally, thanks to their small footprint, these dc-dc modules are favored in applications with limited board space, including handheld equipment, medical devices, and remote sensing.

Wide Temperature Range

Target applications:

  • Automotive electronics, railway, industrial sensing, outdoor security.

Low Power Consumption

Target applications:

  • Infrared temperature detectors, hand-held GPS, portable communication equipment.

Low Ripple & Noise

Target applications:

  • Electrocardiography, spectrum therapy, weak signal detection, processing devices.

Compact Package

Target applications:

  • Handheld equipment, medical devices, remote sensing.

Product Benefits

With efficiency levels reaching 96%, CUI's switching regulators are an energy-efficient solution, greatly reducing power consumption near the load. Additionally, users are able to avoid using a heat sink, which is necessary when implementing linear regulators. This becomes very important in space critical applications. Additional features include a wide input voltage range, low ripple and noise, continuous short circuit and thermal protections, as well as pin compatibility with LM78XX and LM79XX series linear regulators, making the series a perfect drop-in replacement.

Positive to Negative Conversation Option

The application circuit above demonstrates that with the addition of two small external capacitors, CUI's switching regulator series is able to convert a positive input voltage to a negative output voltage, further increasing the series' flexibility. Please refer to the datasheet for details.

Available Products


CUI's P78 and V78 models range from 500 mA to 2 A in SIP and SMT packages with a number of available output voltages and an input range ratio as wide as 8 to 1.


Series Output (Vdc) Size (mm) Package Type
P7805-S 1.5, 1.8, 2.5, 3.3, 5, 6.5, 9, 12, 15 11.6 x 7.5 x 10.2 SIP
V78W-500 3.3, 5, 6.5, 9, 12, 15, 24 Vertical orientation: 11.5 x 9.00 x 17.5
Right angle orientation: 11.5 x 17.5 x 9.00
SIP
V78-500-SMT 3.3, 5, 12, 15 15.24 x 8.5 x 7.0 SMT
V78-1000 3.3, 5, 6.5, 9, 12, 15 Vertical orientation: 11.5 x 9.00 x 17.5
Right angle orientation: 11.5 x 17.5 x 9.00
SIP
V78-1000-SMT 1.5, 1.8, 2.5, 3.3, 5, 6.5 15.24 x 8.5 x 7.0 SMT
V78-1500 2.5, 3.3, 5, 6.5 Vertical orientation: 11.5 x 9.00 x 17.5
Right angle orientation: 11.5 x 17.5 x 9.00
SIP
V78-2000 2.5, 3.3, 5, 6.5 Vertical orientation: 11.5 x 9.00 x 17.5
Right angle orientation: 11.5 x 17.5 x 9.00
SIP

Summary

CUI's switching regulators are an energy-efficient solution, greatly reducing power consumption near the load. The series also offers a wide input range and numerous output voltages to make CUI's switching regulators the ideal drop-in replacement for a host of applications. Visit our webpage for more information.


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