voltage converter

DC/DC Converter using LT1376 Schematic Circuit Diagram

Efficient Heat Dissipation with Adjustable Switching Regulator

Utilizing a switching regulator with an adjustable output voltage is a valuable tool in the battle to minimize heat dissipation in electronic circuits. The step-down converter presented here offers versatility, compatible with input voltages ranging from 7.5 V to 25 V, and capable of delivering an output current of up to 1.5 A. Remarkably, even at its minimum output voltage of 3.3 V, the circuit can function efficiently with a 5 V input. The core of this design is the Linear Technology LT1376, primarily derived from the specifications outlined in the device’s datasheet [1]. The selection of inductor L1’s minimum inductance and current rating is contingent upon the desired maximum output current. For instance, an inductance value of 5 μH suffices for 0.6 A, 10 μH for 1 A, and 20 μH for 1.5 A. In the circuit diagram, a 22 μH inductor is depicted.

DC DC Converter using LT1376 Schematic Circuit Diagram

Determining Maximum Output Voltage: Input Voltage and Current Requirements

The attainable maximum output voltage hinges on the available input voltage and the demanded output current, a wealth of details available within the datasheet. To ensure adaptability, the adjustment range of R2 must be ample, enabling the circuit to yield output voltages spanning from 3.3 V to 14.5 V in all scenarios.

Expected Circuit Characteristics: Typical Performance with Given Components

Given the specified component values, the circuit is anticipated to exhibit certain typical characteristics, setting the stage for its performance expectations.

DC DC Converter using LT1376 Schematic

Determining Maximum Output Current: Considerations for Components

The achievable maximum output current is significantly influenced by the quality of both choke L1 and electrolytic capacitor C5. In the case of the inductor, its DC current and resistance ratings are pivotal, alongside its inductance value. It is imperative for the current rating to be at least twice the maximum desired output current of the circuit, and the DC resistance should be kept as low as possible. Similarly, for the capacitor, a low Equivalent Series Resistance (ESR) is indispensable to ensure optimal performance.

Efficient Circuit Assembly: PCB Design and Availability of Files

To facilitate the assembly process, the author has developed a compact printed circuit board measuring 31 mm by 52 mm, specifically designed for constructing the circuit. This board also includes space for a protective fuse, enhancing safety measures. The layout and schematic files are accessible for free download in Eagle format at [2], providing enthusiasts with easy access to the necessary resources.

Internet Links
[1] www.linear.com/product/LT1376
(datasheet)
[2] www.elektor.com/110286
(downloads)

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