LC5546LF

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

LED drivers are an important class of products among power management integrated circuits (PMICs). The LC5546LF is a current-mode, primary side, non-inverting buck-boost led driver developed by ON Semiconductor, which allows the output current ratio to be adjusted via a single external resistor. It is optimized for converting the forward voltage of high-brightness LEDs and is capable of delivering up to 500 mA of output current.

The LC5546LF is a primary side, LED driving solution, so there is no feedback circuit, which allows it to operate in a very low-noise or current mode. It also has an integrated 8-bit digital dimming control and a 400 kHz operating frequency, which increases efficiency and provides smoother LED current driving. Its operating range is 4.5 V to 65 V and it has a maximum output current of 500 mA. The output voltage can be adjustable between 2.6 V to 34 V.

The LC5546LF is ideal for a variety of applications, including home appliances, computer and display backlights, LED panel lighting and automotive lighting. It can drive up to six ultra-bright LEDs in series. Additionally, it is also internally protected against overvoltage, undervoltage, and overcurrent, providing failsafe protection for the load.

The working principle of the LC5546LF is based on the buck-boost topology. The internal voltage regulator is connected to the output Vout, which helps regulate its output current. The output voltage is adjusted according to the output current and is kept at a constant level by the control loop. The input stage of the driver consists of two MOSFETs (an N-channel and a P-channel MOSFET). During normal operating conditions, the N-channel MOSFET is turned off and the P-channel MOSFET is turned on, pushing or pulling current through the LED chain. The output voltage is adjusted with the LED current to maintain a constant output voltage.

The output stage of the LC5546LF contains six LEDs, which can be driven by the output current provided by the internal voltage regulator. The LEDs will be dimmed according to the control input provided by the control loop. The dimming control is 8-bit digital and it can be set from 0-255, allowing for precise dimming control. The dimming and output current can also be adjusted using an external resistor.

The LC5546LF is an advanced LED driver solution for a variety of LED applications. It has a wide operating range, high efficiency, and can provide up to 500 mA of output current. It also provides internal Over-voltage and Over-current control, and 8-bit digital dimming control. This makes it a great choice for a variety of applications, including home appliances, computer and display backlights, LED panel lighting, and automotive lighting.

The specific data is subject to PDF, and the above content is for reference