LM20323MH/NOPB

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LM20323MH/NOPB Application Field and Working Principle

The LM20323MH/NOPB is a high efficiency buck converter that is suitable for a variety of consumer and industrial applications. It is part of the DC/DC switching regulator family, designed to operate in either a buck or boost configuration. The device has an adjustable switching frequency of up to 2.2MHz and an operating temperature range from -40°C to +85°C. It incorporates advanced synchronous rectification technology to optimize efficiency and reduce power dissipation.

Features

• Wide input voltage range from 4V to 40V
• Up to 10A output current
• High efficiency up to 97%
• Internal MOSFETs with low on-resistance
• Input UVLO and OVLO protection
• 1.2MHz to 2.2MHz adjustable switching frequency
• Fixed off-time control mode and cycle-by-cycle current limit
• Under voltage lockout and thermal shutdown protection
• Adjustable output voltage range of 0.8V to 18V

Applications

• Portable instrumentation
• DC motor applications
• LED driver applications
• Battery powered consumer and industrial applications

Working Principle

The LM20323MH/NOPB is a synchronous, step-down DC/DC switching regulator, which is capable of adjusting the output voltage. It achieves this by controlling the output switching frequency, which is adjustable from 1.2MHz to 2.2MHz. The device has an internal low-on resistance N-channel MOSFET and a high side P-channel MOSFET to regulate the output current.The input voltage is stepped-down through two power stages, the first stage being a PWM controller and the second stage being a PWM quasi-resonant controller. The PWM controller adjusts the switching frequency and duty cycle of the power switch to control the output voltage. When the voltage falls below the threshold voltage, the PWM controller turns off the power switch and a burst mode operation starts until the voltage reaches the threshold voltage again. This cycle is repeated continuously until the desired output voltage is maintained.The quasi-resonant controller ensures that the power switch is in the off-state for a minimum amount of time so as to reduce power loss and maintain high efficiency. The LM20323MH/NOPB also includes a soft-start feature to reduce the inrush current and over current protection to prevent damage to the circuit.

Conclusion

The LM20323MH/NOPB is a high efficiency, DC/DC switching regulator that is suitable for a variety of consumer and industrial applications. Its wide input voltage range, adjustable switching frequency and protection features make it an ideal choice for a variety of projects. It is easy to use and can be used with either a buck or boost configuration.

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