LM2787BP/NOPB

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LM2787BP/NOPB Application Field and Working Principle

The LM2787BP/NOPB is a monolithic DC-DC switching current regulator integrated circuit (IC) from Texas Instruments. It is ideal for applications where high power and efficiency is required. The chip is a fixed-frequency, pulse width modulated (PWM) regulator which provides multiple regulated output voltages that are adjustable from 0.8 V to 5 V. It also features a power save mode for further energy savings. This high-performance chip is suitable for use in a wide range of DC–DC switching regulator circuits.

Features and Benefits

The LM2787BP/NOPB IC offers several features making it an ideal choice for DC–DC switching regulators. These include:

• High efficiency: It has a very high efficiency in spite of the wide range of output voltages it produces.
• Multi-functionality: In addition to providing a wide range of output voltages, the chip offers several functionssuch as error correction, soft start, temperature monitoring, current limiting and power save mode.
• Size and functionality: Although a very small size, the chip provides the full functionality of a switching regulator.
• Low cost: The chip is available in a cost effective package, saving additional costs that may be incurred if mounted on a printed circuit board.

Applications

The LM2787BP/NOPB is an ideal choice for DC–DC switching regulator applications in numerous products. These include, but are not limited to:

• Portable and portable flashing lights.
• Smartphones or other devices where the battery voltage needs to be regulated.
• USB chargers and adapters.
• DC–DC power supplies.
• DC–DC converters.
• Switching power supplies.
• Portable radio frequency (RF) transmitters and receivers.
• LCD and LED displays.
• Laptops and notebook computers.
• Cordless phones.
• Wireless Broadcasting Equipment.
• CATV, DTV and Satellite Broadcasting Equipment.
• Security and surveillance systems.
• Automotive electronics.

Working Principle

The LM2787BP/NOPB works on the concept of pulse-width modulation (PWM). It consists of two functional blocks, namely, the control block and the power block. The control block is used for control of the PWM algorithm and for controlling the feedback for the output voltage. The power block consists of an chopper and an adjustable voltage regulator and works as a driver for the PWM algorithm. The chopper is responsible for generating the PWM waveform while the regulator is responsible for controlling the output voltage.

In operation, the LM2787BP/NOPB constantly switches the chopper on and off modulated by the current control loop. This creates a fixed frequency rectangular waveform which is converted to an average voltage by the regulator. This average voltage is compared to the reference voltage supplied by the user and the difference is adjusted accordingly by the current control loop. As the reference voltage is adjusted, the output voltage of the chip is also adjusted. The output voltage is monitored by the control block and this feedback loop is used to adjust the current loop for maintaining the desired output voltage.

The LM2787BP/NOPB is capable of operating at frequencies up to 1MHz, providing high efficiency and low noise operations. It supports a wide input voltage range from 5 V to 50 V and its adjustable output voltage is from 0.8 V to 5 V. It is available in both TO-263 and TO-252 packages, with a thermal shutdown feature to prevent damage due to high temperature.

Conclusion

The LM2787BP/NOPB is a highly efficient and easy-to-use monolithic DC-DC switching converter IC, designed to address the ever-changing power requirements of today’s communication and appliance products. It is capable of withstanding wide input voltages and is able to provide multiple regulated output voltages for these applications. It is available in a cost effective package, which makes it easy to install and use in various applications. With these features and benefits, the LM2787BP/NOPB is ideal for use in DC–DC switching regulator circuits.

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