The "LM2596S-ADJ" is a popular adjustable step-down (buck) voltage regulator IC manufactured by Texas Instruments (formerly National Semiconductor), widely used for converting higher DC voltages to lower DC voltages. The “-ADJ” in the part number indicates that it is an adjustable version, meaning the output voltage can be set using external resistors.
Here’s a detailed breakdown of the information you requested:
1. Manufacturer and Brand:
Brand: Texas Instruments (previously National Semiconductor).2. Package Type:
The LM2596S-ADJ typically comes in a TO-220 package.3. Pin Function and Specification:
The TO-220 package of the LM2596S-ADJ has 5 pins, and each pin has a specific function. Here’s the detailed pinout and function list:
Pin Number Pin Name Pin Function Pin 1 Input (Vin) This is the input pin for the DC voltage supply. It is typically connected to the positive input of the voltage source (e.g., 12V, 24V DC). Pin 2 Ground (GND) This is the ground pin and is used to complete the circuit by connecting to the common ground. Pin 3 Feedback (Vout Adjust) This pin is used to set the output voltage. It connects to a resistive divider that allows the output voltage to be adjusted from 1.23V to 37V. Pin 4 Output (Vout) This is the output pin where the regulated voltage is provided. The voltage here is controlled by the feedback pin. Pin 5 Switching Node (SW) This pin connects to the external inductor and switches to transfer energy in the buck conversion process. It acts as the high-side switch output.4. Circuit Principle:
The LM2596S-ADJ is a buck converter that operates by switching the input voltage on and off rapidly. It uses an external inductor and capacitor to smooth out the output and provide a stable, regulated DC output. The switching frequency is typically around 150kHz. The feedback pin monitors the output voltage and adjusts the duty cycle of the switching transistor to maintain the desired output voltage.
5. Pin FAQ: 20 Common Questions:
What is the input voltage range for LM2596S-ADJ? The input voltage range for LM2596S-ADJ is typically between 4V and 40V. What is the output voltage range for LM2596S-ADJ? The output voltage is adjustable from 1.23V to 37V depending on the resistor configuration. What is the typical output current of the LM2596S-ADJ? The typical output current is up to 2A, with a maximum of 3A under ideal conditions. How do I adjust the output voltage on LM2596S-ADJ? The output voltage is adjusted using a resistive voltage divider connected to the feedback pin (pin 3). What is the switching frequency of the LM2596S-ADJ? The switching frequency is typically around 150kHz. Can the LM2596S-ADJ regulate negative output voltages? No, the LM2596S-ADJ can only provide positive output voltages. What is the efficiency of the LM2596S-ADJ? The typical efficiency ranges from 75% to 90%, depending on input-output voltage difference and load. What types of capacitors are recommended for the LM2596S-ADJ output? Low ESR (Equivalent Series Resistance ) electrolytic capacitors or ceramic capacitors are recommended for stability. What is the role of the inductor in the LM2596S-ADJ circuit? The inductor is used to store energy and smooth out the current during the buck conversion process.What should I connect to the ground pin of LM2596S-ADJ?
The ground pin should be connected to the common ground of the input and output circuit.What type of diodes are used with the LM2596S-ADJ?
A Schottky diode is commonly used to minimize forward voltage drop and increase efficiency.What is the maximum input voltage for the LM2596S-ADJ?
The maximum input voltage is 40V.Can the LM2596S-ADJ be used for 12V to 5V step-down applications?
Yes, it is commonly used to step down 12V to 5V.What is the maximum output current for LM2596S-ADJ?
The maximum output current is 3A, though typical operation is at 2A.Can I use the LM2596S-ADJ for high power applications?
The LM2596S-ADJ is suited for moderate power applications with an output current of up to 3A.What is the temperature range of the LM2596S-ADJ?
The operating temperature range is typically from -40°C to +125°C.What type of load can the LM2596S-ADJ handle?
It can handle both resistive and capacitive loads, but performance may degrade with high inductive loads.How can I protect the LM2596S-ADJ from overcurrent conditions?
Using external protection such as fuses or current-limiting resistors can prevent overcurrent damage.Is there a need for heat dissipation when using LM2596S-ADJ?
Yes, if the output current is high, heat dissipation may be necessary, especially in continuous operation at higher currents.Can I use the LM2596S-ADJ in parallel with other LM2596S module s?
It is not recommended to use multiple LM2596S-ADJ modules in parallel for current sharing without proper load balancing.Let me know if you need further clarification or if you want additional information!
