LM2596S-ADJ

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SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator

Below is the parameter table and instructions for the LM2596S-ADJ adjustable switching regulator.

LM2596S-ADJ Parameter Table

Instructions for Using the LM2596S-ADJ

1. Circuit Configuration:

   • Input Capacitor (CIN): Place a 10μF to 100μF electrolytic capacitor close to the input pin to filter out noise and provide a stable input voltage.
   • Output Capacitor (COUT): Use a 100μF to 1000μF electrolytic capacitor on the output to smooth the output voltage. For better performance, a 10nF ceramic capacitor can be added in parallel.
   • Feedback Resistor Network: The output voltage is set by a resistor divider network connected to the ADJ pin. The formula to calculate the output voltage is: [ V_ = 1.23 left(1 + fracright) ] where ( R_1 ) is the resistor from the ADJ pin to ground, and ( R_2 ) is the resistor from the output to the ADJ pin. A typical value for ( R_1 ) is 1.0kΩ.

2. Component Placement:

   • Ensure that all components are placed as close as possible to the IC to minimize parasitic inductance and improve stability.
   • Use short leads and wide traces for the input and output capacitors to reduce inductance.

3. Thermal Considerations:

   • The LM2596S-ADJ can dissipate significant power, especially at high output currents. Ensure adequate heat sinking or use a heatsink if necessary to keep the temperature within the operating range.

4. Protection:

   • The IC has built-in overcurrent and thermal shutdown protection. However, it is recommended to include external fuses or current-limiting resistors to protect against short circuits and overloads.

5. Testing:

   • After assembly, test the circuit with a known load to ensure the output voltage is stable and within the desired range.
   • Measure the ripple on the output using an oscilloscope to ensure it meets the application requirements.

6. Layout Considerations:

   • Keep the ground plane solid and continuous to provide a low-impedance return path for all currents.
   • Avoid routing high-frequency signals near the input and output capacitors to prevent noise coupling.

By following these instructions, you can ensure reliable and efficient operation of the LM2596S-ADJ in your power supply design.