dc to dc converter

This is a simple circuit of a DC to DC converter utilizing the LM317T integrated circuit (IC). The LM317 is a well-known IC that comes in a TO-220 package. This high-performance IC features an input voltage range of 3 to 40 volts DC and provides a regulated output voltage ranging from 1.25 to 37 volts DC with a maximum output current of 1.5A. The IC includes built-in current limiting, thermal overload protection, and safe area protection. The circuit described functions as a step-down fixed voltage DC to DC converter. Numerous fixed voltage DC to DC step-down converter ICs are available on the market, such as the LM7805 for a fixed output of 5 volts DC and the LM7809 for a fixed output of 9 volts DC. However, the LM317 allows for adjustable output voltages between 1.2 and 37 volts DC by selecting appropriate resistor values for R1 and R2. An output voltage chart is provided to assist in determining suitable resistor values for R2 to achieve the desired output voltage. Additionally, an LM317 voltage calculator can be used to adjust R1 values between 150 to 470 ohms to obtain the desired output voltage. The input voltage should be 2 to 3 volts higher than the output voltage. It is recommended to use an appropriate heatsink with the IC. A variable resistor can also be used in place of R2 if desired.

The LM317T DC to DC converter circuit is designed to provide a stable and adjustable output voltage, making it suitable for various applications where a specific voltage is required. The circuit configuration typically consists of the LM317T IC, two resistors (R1 and R2), and a capacitor for stability. The output voltage is determined by the resistor values according to the formula: Vout = Vref (1 + R2/R1) + Iadj * R2, where Vref is typically 1.25V.

To ensure optimal performance, it is essential to select the resistors carefully. R1 is often fixed at a value between 150 to 470 ohms, while R2 can be adjusted to achieve the desired output voltage. The use of a variable resistor for R2 allows for fine-tuning of the output voltage.

The input voltage must always exceed the desired output voltage by at least 2 to 3 volts to ensure proper regulation. The LM317T also has built-in features that protect against overcurrent and overheating, which enhances the reliability and safety of the circuit.

When implementing this circuit, it is crucial to include a heatsink with the LM317T to dissipate heat effectively, especially when operating at higher output currents. The layout of the circuit should minimize the distance between components to reduce parasitic inductance and resistance, ensuring stable operation.

Overall, the LM317T DC to DC converter circuit is a versatile solution for applications requiring adjustable voltage regulation, providing both simplicity in design and effectiveness in performance.Here is a easy circuit of a DC to DC converter using LM317T IC. LM317 is a very famous IC comes in TO 220 package. This high performance IC has a lot of good features like input supporting voltage from 3 to 40 volt DC and delivers regulated output from 1. 25 to 37 volt DC with 1. 5A output current. The IC also contains build in current limiter, buil t in thermal overload protection and safe area protection. The circuit mentioned here will perform the task of step down fixed voltage DC to DC converter. There are many fixed voltage DC to DC step down converter ICs are available in the market like LM7805 for DC 5 volt fixed output, LM7809 is for DC 9 volt fixed output etc. But LM317 is a single IC from which you can get any fix output voltage between 1. 2 to 37 volt DC by using suitable values of resistor R1 and R2. The output voltage chart mentioned below will help you in choosing the suitable value of resistor R2 to get the desired output voltage.

You can also use the LM 317 voltage calculator chart mentioned here: In this calculator you can also adjust the value of resistor R1 between 150 to 470 ohms to get the desired output voltage. The input voltage must be 2 to 3 volt greater than the output voltage. Use a suitable heatsink with the IC. You can also use a variable resistor in the place of R2 if desired more details are here 1. 25V - 37V 1. 5A Variable / Adjustable Power Supply Using LM317. 🔗 External reference