FLS0116MX Integrated Circuits (ICs)

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PMIC - LED Drivers: FLS0116MX application field and working principle

The FLS0116MX is a monolithic PMIC - LED Driver designed to meet the needs of a diverse range of applications, such as telephone, PDA, and laptop computers, handheld and other portable electronic products. It incorporates differential sensing of output voltage and current and provides a regulated voltage and current for driving LED for display lighting. The FLS0116MX can be used to drive external LED arrays with up to 1.2A of LED current, with a great level of flexibility and ease. It is specifically designed to guarantee excellent performance, reliability and minimum component count to reduce cost.

Basic Application Scenario

The target application of the FLS0116MX is personal electronic products. It uses a single-stage circuit consisting of an internal power MOSFET, a current sensing resistor, a voltage sensing resistor and a voltage reference. Its internal control can accurately limit the LED current. It can also be used as a constant current source. The LED current is approximately 1/10th of the peak current flow in the external power MOSFET. The voltage reference is adjustable and can be adjusted to the desired LED current. An external PWM signal is used to control the conduction of the power MOSFET, thus modulating the LED current. In addition, the FLS0116MX also provides an active current limit feature, thermal shutdown and a low voltage under-voltage lockout feature.

Features and Advantages

The FLS0116MX has several distinguishing features that make it an ideal choice for portable devices. The low operating current of 2.4mA maximum enables the IC to be operated even when the battery voltage is low, which is essential for applications with changing battery voltage due to the telecommunication protocol. This feature also limits the power dissipation in stand-by. A low ground pin current produces extremely low-noise operation, which is essential in power-sensitive applications. Mobile phones relying on the FLS0116MX need not worry about interference on the audio signal. The PWM signal input allows the LED current to be modulated from 0 to 100%, even with a low voltage source. It also provides LED thermal shutoff to protect the LED from overheating when the LED junction temperature exceeds its rated maximum value.

Working Principle

The FLS0116MX is a monolithic integrated circuit with a single-stage circuit topology. The circuit consists of an internal power MOSFET and a current sensing resistor, a voltage sensing resistor and a voltage reference. Its internal control can accurately limit or provide a constant LED current without need for any external components. The voltage reference can be trimmed to the desired output current. The FLS0116MX measures the current in the power MOSFET through the external current sensing resistor and adjusts the output current to the target level. The voltage sensing resistor measures the output voltage and adjusts the output voltage to the target level. The PWM signal is used to control the conduction of the power MOSFET and to modulate the LED current.

Conclusion

The FLS0116MX is a versatile PMIC - LED Driver designed for narrow current ranges, low power dissipation and compact footprints for portable electronic products. Its low operating current and low ground pin current renders it suitable for power-sensitive applications. The PWM signal provides a highly-flexible control, from 0 to 100%, even with a low voltage source. The external current sensing resistor and voltage sensing resistor are used to accurately limit and provide a constant LED current. The FLS0116MX also provides an active current limit and thermal shutoff feature, further guaranteeing the device’s reliability and long life span.

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