MR37509MP97

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LEDs are available in various sizes, shapes and luminous intensities, allowing for many applications, including circuit board indicators, arrays, light bars, bar graphs, etc. The MR37509MP97 is a precise and reliable LED driver chip used in such applications. This article will discuss the fields of application and working principle of this chip.

Application Fields

MR37509MP97 can be used in many applications as an LED driver. Examples include automotive/motorcycle lighting, indication and instrumentation, decorative/architectural lighting, medical/dental lighting, general purpose lighting, and security/emergency lighting. For applications that require precise control of LED illumination, the MR37509MP97 is the perfect device for this use.

Aside from driving LEDs for illumination, the MR37509MP97 can also be used for multicolor LED displays, LED turn signals or LED backlight applications. This LED driver can also be used for LED-based projection systems, LED arrays, and LED spot lighting.

Working Principle

The MR37509MP97 is a boost/buck-boost continuous current LED driver. It is designed to drive up to eight connection LEDs with 0.2~2A without additional external components. It is a current-mode LED driver that can regulate LED current precisely and guarantee reliable LED protection.

The working principle of the MR37509MP97 starts with the input power supply, which is converted into a low-ripple output voltage through the basic boost circuit. The boost voltage is fed into the control chip, where it is converted into a pulse-width modulation (PWM) signal, which is then used to modulate the output driver circuit to drive the LEDs. The output driver circuit can be configured in two different modes, series-parallel mode and parallel-parallel mode, allowing it to drive up to eight different channels.

The chip also has a built-in high-accuracy current regulator, which allows for precise control of the output current. The current regulator is based on an analog current-feedback loop with digital regulation, which is then coupled with a temperature compensation system for extra accuracy and reliability. The chip also has a built-in low-side sensing circuit, which ensures that the output current remains stable even with varying input voltages.

The MR37509MP97 also has many integrated protections, such as over-voltage, under-voltage, open-circuit, and short-circuit protection. These provide reliable protection to ensure safe operation of the circuit.

Conclusion

The MR37509MP97 is a precise and reliable LED driver chip that can be used in many applications. It is a boost/buck-boost continuous current LED driver and can drive up to eight connection LEDs with 0.2~2A without any additional external components. It is also equipped with a high-accuracy current regulator and a built-in temperature compensation system, as well as a low-side sensing circuit for extra accuracy. This LED driver also has many integrated protections to ensure safe operation of the circuit.

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