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 CUI's switching regulators and their available configurations.
  • Describe key features and specifications.
  • Compare performance vs. comparable 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 regulators are able to achieve the same results in a much more efficient manner.

Linear vs. Switching Regulators

CUI's switching regulators hold 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, many of 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 their flexibility.


 
  Switching Regulators Linear Regulators
Efficiency 84~97% 40~60%
Heat Sink 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 in devices where power consumption is a consideration, including infrared detectors, hand-held GPS devices, and portable communication equipment. Where ripple and noise are a concern, such as electrocardiography, spectrum therapy, weak signal detection, and processing equipment, 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 97%, 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 and 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 modules a perfect drop-in replacement.

Positive to Negative Conversion Option

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

Available Products


CUI's 500 mA switching regulators are available 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 Negative Output Capability
VX78-500 3.3, 5, 9, 12, 15 11.6 x 7.55 x 10.16 SIP Yes
VXO78-500 3.3, 5, 12, 15 10 x 7.2 x 11 SIP Yes
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 Yes
P78A-0500 3.3, 5 11.6 x 8.5 x 10.4 SIP No
V78-500-SMT 3.3, 5, 12, 15 15.24 x 8.5 x 7.0 SMT No
V78W-500 3.3, 5, 6.5, 9, 12, 15, 24 Vertical orientation: 11.5 x 9.00 x 17.5 SIP No

V78W-500R
3.3, 5, 6.5, 9, 12, 15, 24 Right angle orientation: 11.5 x 17.5 x 9.00 SIP No

Available Products


CUI's switching regulator line also offers 1, 1.5, and 2 A current output options in SIP and SMT packages with efficiencies up to 97%.


Series Output (Vdc) Size (mm) Package Type Negative Output Capability
P78A-1000 3.3, 5 11.6 x 8.5 x 10.4 SIP No
V78-1000-SMT 1.5, 1.8, 2.5, 3.3, 5, 6.5 15.24 x 8.5 x 7.0 SMT No
VX78-1000 3.3, 5, 9, 12, 15 11.5 x 9 x 17.5 SIP Yes
VXO78-1000 3.3, 5, 12, 15 11.5 x 7.5 x 17.5 SIP Yes
V78-1000 3.3, 5, 6.5, 9, 12, 15 Vertical orientation: 11.5 x 9.00 x 17.5 SIP No
V78-1000R 3.3, 5, 6.5, 9, 12, 15 Right angle orientation: 11.5 x 17.5 x 9.00 SIP No
V78-1500 2.5, 3.3, 5, 6.5 Vertical orientation: 11.5 x 9.00 x 17.5 SIP No
V78-1500R 2.5, 3.3, 5, 6.5 Right angle orientation: 11.5 x 17.5 x 9.00 SIP No
V78-2000 2.5, 3.3, 5, 6.5 Vertical orientation: 11.5 x 9.00 x 17.5 SIP No
V78-2000R 2.5, 3.3, 5, 6.5 Right angle orientation: 11.5 x 17.5 x 9.00 SIP No

Summary

CUI's switching regulators are an energy-efficient solution, greatly reducing power consumption near the load. The various series also offer 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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