SM72485MM/NOPB

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SM72485MM/NOPB Application Field and Working Principle

The Texas Instruments SM72485MM/NOPB is an advanced DC-DC switching regulator designed for an array of high power applications. Ideal for applications requiring high power efficiency, the SM72485MM/NOPB has high output current capability, as well as wide input voltage range, which helps control power delivery into the load. This step-down switching regulator is capable of delivering up to 8 A of continuous current output and has a wide input voltage range of 6 V to 36 V. The SM72485MM/NOPB belongs to the PMIC - voltage regulators - DC DC switching regulators category.

Features of SM72485MM/NOPB

• Input voltage range of 6V to 36V
• Continuous output current of 8A
• Programmable frequency between 0.7MHz and 4MHz
• Adjustable output voltage from 0.8V to 36V
• Thermal shutdown protection

Applications of SM72485MM/NOPB

• High Power DC-DC Converters
• Distributed Power Systems
• Industry Standard Converters
• Advanced Point-Of-Load
• Server and Storage Systems

Working Principle of SM72485MM/NOPB

The SM72485MM/NOPB uses a synchronous fly-back step-down switching converter to convert an input voltage between 6V and 36V to a regulated output voltage between 0.8V and 36V. Using a voltage feedback loop, the converter senses the output voltage and uses the feedback signal to adjust the width of the pulse-width-modulated (PWM) signal sent to a pair of power MOSFETs in order to regulate the output at the desired level. The MOSFETs are operated in a synchronous way, where one (bottom-side) MOSFET is always on when the other (top-side) MOSFET is off, and vice versa. The frequency of the switching is adjustable between 0.7MHz and 4MHz via an external frequency-setting resistor (RSET).

The SM72485MM/NOPB has two stages of protection: Over-Temperature Protection (OTP) and Over-Current Protection (OCP). If the temperature of the IC goes higher than the safe operating temperature range, the OTP circuit kicks in, shutting down the IC. On the other hand, if the output current exceeds the set limit, the OCP circuit shuts down the IC. When any of these protections are triggered, the SM72485MM/NOPB will go into a hiccup mode where the cycle-by-cycle current limit is set to a low level, limiting the output current. Once the temperature (for OTP) or the current (for OCP) reduce to a safe level, the IC will restart automatically.

Conclusion

In conclusion, the SM72485MM/NOPB is an advanced DC-DC switching regulator designed to provide a stable and reliable output voltage with high efficiency and output current capability up to 8A with a wide input voltage range of 6V to 36V. Its programmable frequency gives it the flexibility to be used in different high power applications. It has built-in protection features to protect the device from being damaged due to excess load or temperature. The SM72485MM/NOPB belongs to the PMIC - voltage regulators - DC DC switching regulators category.

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