NR117K

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NR117K Application Field and Working Principle

NR117K belongs to the class of DC-DC switching regulators, or Power Management Integrated Circuits (PMICs). It is a step-up converter, quad voltage regulator and dual LED driver. It is designed to offer energy savings and space savings, as it acts as 4 voltage regulators, 2 LED drivers and a single power supply. This type of PMIC can be used in a variety of applications such as automotive, industrial, lighting, and wearables.

Features

• Step-up regulator with 3V to 48V input voltage range
• Quad voltage regulator with up to 2.6A current output
• Dual LED driver with up to 150mA current output
• Integrated MOSFET to reduce the part count and save power dissipation
• Operating temperature range 0 to 85℃
• Low standby current consumption of ~25μA
• Very low shutdown quiescent current of ~1μA

Working Principle

The NR117K is an integrated DC-DC switching regulator that consists of a step-up regulator, quad voltage regulator and dual LED drivers. It works on a standard switching converter topology, where an external MOSFET switch is periodically turned on and off in order to control the output voltage and current.

When the MOSFET switch is turned on, the input voltage is transferred to the conversion time circuit through the catch diode. The conversion time circuit then drives the MOSFET at precise intervals, allowing for the precise control of the output.

The output voltage is set by an external voltage reference and an error amplifier. The precise control of the MOSFET switching frequency is achieved through a constant-on-time pulse width modulation (PWM) control loop.

The NR117K operates in the CCM or discontinuous conduction mode depending on the load. In CCM, most of the energy is delivered during the switch on time whereas in DCM the energy is delivered evenly over the cycle. It also has a frequency modulation scheme to reduce the switching frequency of the MOSFET under light load conditions.

Applications

The NR117K DC/DC switching regulator can be used in a variety of electronic products and applications. It fits perfectly into industrial, automotive, consumer, medical, lighting and wearables. It can be used to power microcontrollers, sensors and LEDs, providing a small and efficient solution compared to their linear counterparts.

In automotive applications, the NR117K is ideal to provide a steady and reliable power supply to electronic systems, such as power windows, starter/ignition systems, and traffic safety systems. Its compact size also allows easy integration in a variety of vehicles.

In consumer electronics, the NR117K can be used to provide energy saving solutions for devices such as portable audio players, digital video cameras, and tablets. Its integrated LED drivers can be used for providing backlighting for LCD screens, providing a long-lasting and energy efficient solution.

In lighting applications, the NR117K can be used to provide a regulated output voltage to control LED brightness. This allows for precise control and efficient powering of LED lighting.

The NR117K is a versatile and efficient DC/DC switching regulator. Its wide range of features and operating temperature make it an ideal choice for a variety of applications.

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