The component you are referring to, " LM2675M-5.0/NOPB ," is a voltage regulator from Texas Instruments. This part belongs to the LM2675 series of regulators, which are fixed voltage switching regulators that are primarily designed for applications requiring a stable 5V output voltage. The "NOPB" suffix indicates that the part is lead-free and compliant with RoHS (Restriction of Hazardous Substances) standards.
Packaging of LM2675M-5.0/NOPB
The part typically comes in a TO-263-5 package, a surface-mount form factor that features 5 pins. This package is known for its ability to dissipate heat effectively, which is critical in Power supply applications.
Pin Function Specifications of LM2675M-5.0/NOPB (TO-263-5 Package)
Here is a detailed list of the 5 pins in the TO-263-5 package for the LM2675M-5.0/NOPB and their functions:
Pin Number Pin Name Pin Function Description 1 VOUT Output Voltage Pin: This pin provides the regulated 5V output voltage from the regulator. It is where the load is connected. 2 GND Ground Pin: This is the common ground reference for the input and output voltages of the regulator. 3 VIN Input Voltage Pin: This pin is where the input voltage is applied to power the regulator. It should be within the range specified in the datasheet (typically 8V to 40V). 4 FB Feedback Pin: This pin is used for regulating the output voltage. A voltage divider network is connected to it for feedback regulation. It maintains the output at the desired voltage (5V for LM2675-5.0). 5 ON/OFF On/Off Control Pin: This pin allows for turning the regulator on or off by applying a logic high or low voltage. If not used, it can be tied to ground to keep the regulator always on.Circuit Principle Instructions for LM2675M-5.0/NOPB
The LM2675M-5.0 is a switching regulator that uses a Pulse Width Modulation (PWM) scheme to regulate the output voltage. The basic operation is as follows:
Input Power: The input voltage (applied to the VIN pin) is typically higher than the output voltage. The range for the input is between 8V and 40V for the LM2675M-5.0. This voltage is used to power the internal circuitry of the regulator.
Switching Mechanism: The regulator uses an internal power MOSFET switch that alternates between on and off states, generating high-frequency pulses. This high-frequency switching is essential for step-down voltage regulation.
Inductor and Capacitors : To smooth the output, an inductor is placed between the VIN pin and the VOUT pin. Additionally, capacitor s are connected across the input and output to filter out noise and ensure stable voltage delivery.
Feedback Control: The feedback pin (FB) is connected to a voltage divider circuit (typically resistors) that samples the output voltage. The regulator adjusts the duty cycle of the switching transistor based on this feedback to maintain a constant output voltage of 5V.
On/Off Control: The ON/OFF pin provides a way to disable or enable the regulator. When the voltage is high (typically 2V or more), the regulator is turned on, and when the voltage is low (typically 0V), the regulator is turned off.
Frequently Asked Questions (FAQ) for LM2675M-5.0/NOPB
1. What is the output voltage of LM2675M-5.0/NOPB? The output voltage of LM2675M-5.0/NOPB is fixed at 5V. 2. What is the input voltage range for LM2675M-5.0/NOPB? The input voltage range for LM2675M-5.0/NOPB is 8V to 40V. 3. What is the maximum output current that LM2675M-5.0/NOPB can supply? LM2675M-5.0/NOPB can supply a maximum output current of 1A. 4. What is the switching frequency of LM2675M-5.0/NOPB? The switching frequency of LM2675M-5.0/NOPB is approximately 52kHz. 5. What are the key applications of LM2675M-5.0/NOPB? LM2675M-5.0/NOPB is typically used in power supplies for communication equipment, automotive systems, industrial electronics, and battery-powered systems. 6. Can I use LM2675M-5.0/NOPB for a 12V input? Yes, LM2675M-5.0/NOPB can operate with a 12V input, as long as it is within the specified input range of 8V to 40V. 7. What are the thermal considerations for LM2675M-5.0/NOPB? LM2675M-5.0/NOPB is available in a TO-263-5 package, which has a good thermal dissipation capability. However, the regulator's thermal performance will depend on the input voltage, output load, and cooling conditions. 8. Can I connect the ON/OFF pin directly to ground? Yes, connecting the ON/OFF pin directly to ground will keep the regulator always on. 9. What is the maximum voltage on the feedback pin (FB)? The voltage on the FB pin should not exceed the regulator’s output voltage by more than 0.3V. 10. Is LM2675M-5.0/NOPB RoHS compliant? Yes, the LM2675M-5.0/NOPB is lead-free and compliant with RoHS standards. 11. What is the typical efficiency of LM2675M-5.0/NOPB? The typical efficiency of LM2675M-5.0/NOPB is around 75%, but this depends on the input-output voltage difference and load conditions. 12. What is the minimum output voltage for LM2675M-5.0/NOPB? The minimum output voltage for this model is fixed at 5V, and it cannot be adjusted. 13. Can I use LM2675M-5.0/NOPB for higher currents? LM2675M-5.0/NOPB is designed for a maximum output current of 1A. For higher currents, you would need a different regulator. 14. How do I calculate the output capacitor for LM2675M-5.0/NOPB? You should use a low ESR (Equivalent Series Resistance ) capacitor with a value in the range of 330µF to 1000µF for stability and performance. 15. Can LM2675M-5.0/NOPB be used in automotive applications? Yes, it is suitable for automotive applications due to its wide input voltage range and robustness. 16. What should I do if the output voltage is unstable? If the output voltage is unstable, check the input voltage, output load, and ensure that the feedback loop components (resistors and capacitors) are correctly designed. 17. Is the LM2675M-5.0/NOPB compatible with other fixed-output models in the LM2675 family? Yes, all the fixed-output versions of the LM2675 series share similar electrical characteristics, but with different output voltages. 18. Can LM2675M-5.0/NOPB be used in battery-powered devices? Yes, LM2675M-5.0/NOPB can be used in battery-powered devices, especially if the battery voltage is higher than 5V. 19. What is the maximum output voltage ripple for LM2675M-5.0/NOPB? The maximum output voltage ripple for LM2675M-5.0/NOPB is typically 50mV. 20. What is the lifespan of LM2675M-5.0/NOPB? The lifespan of LM2675M-5.0/NOPB depends on the operating conditions, but under normal conditions, it is designed to last many years.Summary
The LM2675M-5.0/NOPB is a versatile, efficient voltage regulator suitable for many applications. Its 5-pin TO-263-5 package offers ease of use and reliability. The extensive FAQ section should cover most questions regarding its features and application.
