How LTM8048 μModule Converter Makes Isolated Power Design Easier?

Sometimes the system needs some isolated power supply, but it is not easy to design. Due to the complexity and sensitivity of isolated power supply, design and commissioning usually take a lot of time.

Fortunately, μModule converters can solve this problem!

This blog will introduce why we choose two µmodule converters, LTM8047 and LTM8048, and their structure, practical application and performance, so as to help people who want to easily design isolated power supply! If this blog is helpful to you, don't forget to share this page!

Content

What is the Composition of LTM8047 and LTM8048?

How to Design an Isolated Power Supply with LTM8047 and LTM8048?

What is the Performance of LTM8047 and LTM8048?

Why do LTM8047 and LTM8048 Allow Various Output Configurations?

What is the Composition of LTM8047 and LTM8048?

The LTM8047 and LTM8048 µModule converters take the hassle out of designing isolated power supplies, placing a flyback regulator in a compact 9mm × 11.25mm × 4.92mm BGA RoHS compliant package. The controller, power switching, and rectification elements, as well as transformer and isolated feedback circuitry are all integrated. 

Both parts operate from 3.1V to 32V inputs and produce over 1W of isolated power. 

How to Design an Isolated Power Supply with LTM8047 and LTM8048?

The LTM8048 is identical to the LTM8047 but adds an integrated 300mA linear post regulator. Designing with the LTM8047 and LTM8048 is easy. 

Simple, Compact and Efficient Isolated Power Solutions.

Figure 1 shows a complete LTM8047-based isolated power supply, requiring only the addition of capacitors for input, output, and bias, and a resistor to set the output voltage. The LTM8048 requires only one more component: a resistor to set the voltage of the LDO output, as shown in Figure 2.

 

Figure 1. The LTM8047 only requires four additional components to implement an isolated 5V power supply that accepts an 3.1V–29V input.

 

Figure 2. The LTM8048 is the LTM8047 with the addition of an LDO post regulator. 

As is the case with most flyback converters, the output voltage can be above or below the input, accommodating a wide range of operating conditions. 

What is the Performance of LTM8047 and LTM8048?

And, as is the nature of flyback converters, the amount of current that the LTM8047 and LTM8048 can deliver depends on the input voltage. 

Figure 3 shows the load capability of a typical LTM8047 at 2.5V, 3.3V, and 5V outputs. The LTM8048 features the same load capability.

 

Figure 3. Maximum load capability of the LTM8047 and LTM8048 depends on the input voltage. 

The linear post regulator integrated into the LTM8048 is a high-performance 300mA device, boasting a low dropout of less than 450mV at room temp, full load. 

As shown in Figure 4, the output noise and ripple of the post regulator is less than 1mV. These measurements were taken using a 150MHz HP-461A differential amplifier. 

 

Figure 4. The output noise of the LTM8048 post regulator is less than 1mV. 

Why do LTM8047 and LTM8048 Allow Various Output Configurations?

The LTM8047 and LTM8048 both integrate a transformer that is rated for 725VDC isolation. Every isolated µModule converter is factory-tested for 100% reliability, with 725V applied in one direction for one second, followed by the reverse voltage for one second. 

For flexibility, there is no circuitry connected between the primary and secondary, so if a safety capacitor or other elements are required for a system, they can be added. This flexibility allows various configurations of the output. 

As shown in Figure 5, for example, two LTM8047s can be combined to deliver individually regulated positive and negative outputs.

 

Figure 5. Use two LTM8047 converters to produce ±5V from a 3.5V–31V input. 

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Conclusion 

This blog introduces two µmodule converters, LTM8047 and LTM8048, along with their construction, practical application, and performance. By reading the above content, I believe it will definitely help you who want to design an isolated power supply simply! If you need more technical information about the μModule converter, please feel free to post your comments below, and we will get back to you as soon as possible. If it is helpful to you, don’t forget to share it!

Frequently Asked Questions

1. Q: What is the Role of Isolation in the Power Supply Design Module?

A: Signal isolation in all power applications maintains integrity by preventing high-frequency noise propagation, thus protecting sensitive circuits from high voltage spikes. In such applications, an isolated power supply is needed to provide power to different electrical components.

2. Q: Why do we Use Isolated Power Supply?

A: Because the isolated power supply provides a clear barrier, dangerous voltages will not pass. This provides security. The disadvantage is low efficiency, and due to the transformer required for isolation, the package size is larger than that of a non-isolated power supply.

3. Q: What are the Usual Types of Isolators?

A: According to the power system location, the isolator can be classified into three types namely bus side, line side, and transfer bus side isolator. Power System Location based Isolators.

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Also read

● How LTM8022 μModule Regulator Provides a Better Design for Power Supply?

● How LT3800 Converter Handles High Input Voltages More Easily?

● How LTC1771 Buck Converter Extends Battery Life in Handheld Electronics?

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