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The LP8861-Q1 has an option to drive an external pFET to disconnect the input supply from the system in the event of a fault and reduce inrush current and standby power consumption. The device can reduce
LED current based on temperature measured with external NTC sensor to protect LED from overheating and extend LED lifetime.
The input voltage range for the LP8861-Q1 is from 4.5 V to 40 V to support automotive stop/start and load dump condition. The LP8861-Q1 integrates extensive fault detection and protection features.

Product Attributes

LED Driver

What is an LED Driver?

An LED driver is a power-adjusted electronic device that drives the normal operation of an LED light or LED module assembly. Due to the conduction characteristics of the LED PN junction, it can adapt to the voltage and current variations of the power supply is very narrow, a slight deviation may not be able to light the LED or light efficiency is seriously reduced, or shorten the life of the chip or even burned. Current industrial power supplies and common battery power supplies are not suitable for direct supply to LEDs, and the LED driver is the electronic component that can drive the LED to operate at the optimum voltage or current.

Applications

Applications of LED Drivers.
As LEDs are used in almost every area of electronics applications, with almost unpredictable variations in luminous intensity, light color, and on/off control, LED drivers have become almost one-to-one servo devices, making for a diverse family of devices. The simplest LED driver (if you can call it that) is probably one or several series-parallel resistive components in a circuit that divides the current and voltage, and it is not a stand-alone product at all. For more general commercial applications that require a stable constant current and voltage output, a range of system solutions with precise power conditioning capabilities has been developed. The realization of these solutions often requires a more complex circuit design, the core of which is the integrated application of LED driver ICs. By setting up different support circuits at the periphery of the LED driver ICs, solutions can be built for different LED applications, from small mobile phone display backlighting and keypad lighting drivers to high-power LED street lighting and large outdoor LED displays.
The design and supply of more generic high-power LED drivers are generally undertaken by specialist companies. These companies package them into modules and then supply them to manufacturers of LED end-use products. The unique importance of LED drivers in LED applications and the wide range of user requirements make the LED driver IC, the heart of the LED driver, a key element in the entire technology chain. The driver is the core component of LED lighting. With the maturity of LED chip technology, the quality of LED light sources has become so reliable that in many cases the failure of LED luminaires comes from the driver.

Description

The LP8861-Q1 is an automotive high-efficiency, low-EMI, easy-to-use LED driver with integrated boost/SEPIC converter. It has four high-precision current sinks that can provide high dimming ratio brightness control with a PWM input signal.
The boost/SEPIC converter has adaptive output voltage control based on the LED current sink headroom voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions. The boost/SEPIC converter supports spread spectrum for switching frequency and an external synchronization with dedicated pin. A wide-range adjustable frequency allows the LP8861-Q1 to avoid disturbance for AM radio band.
The LP8861-Q1 has an option to drive an external p-FET to disconnect the input supply from the system in the event of a fault and reduce inrush current and standby power consumption. The device can reduce LED current based on temperature measured with external NTC sensor to protect LED from overheating and extend LED lifetime.
The input voltage range for the LP8861-Q1 is from 4.5 V to 40 V to support automotive stop/start and load dump condition. The LP8861-Q1 integrates extensive fault detection and protection features.