Car headlights play an important role in driving, providing illumination, increasing visibility, conveying the driver's intentions, and improving visibility. These features help improve driving safety and reduce the risk of accidents. As an important part of the automobile headlight system, the headlight driver chip plays a vital role in the reliability and stability of the headlight system. The latest DIA82901 launched by Diao Micro is the best driver solution for this application.

DIA82901 is a very flexible DC/DC controller with rich built-in diagnostic and protection functions. A variety of power topology architectures can be realized by simply adjusting external components, and each topology supports two modes: constant current/CC and constant voltage/CV.

The built-in pulse width modulator can easily realize the dimming function to reduce color shift, and includes a spread spectrum modulator to improve EMC performance; the current mode control used can achieve a stable regulation loop through a simple compensation circuit; the built-in The soft-start function effectively limits current spikes and voltage overshoots at startup.

Car headlights generally include high and low beams, turn signals, daytime running lights and position lights. The number of lamp beads of different types varies greatly. DIA82901 supports five topologies: Boost, Buck, Buck-Boost, SEPIC, and FLYBACK, which can perfectly cover all applications in headlights.

Product Features

• Wide input voltage range: 4.5 - 60V

• Output voltage can reach up to 60V

• Switching frequency range: 100kHz-500kHz

• Based on constant current/constant voltage mode, supports five power topologies

• 15uA extremely low shutdown current

• Support spread spectrum function: 7kHz, +/-15%

• Flexible dimming method:

External PWM dimming

Internal PWM dimming: changing duty cycle and frequency via external R&C

Analog dimming: adjust the current by changing the voltage of the SET pin

• Complete diagnosis:

SWO&PWMO shutdown: output overvoltage, open circuit, short to ground, open feedback loop

SWO&PWMO shut down, LDO shut down: over temperature, input under voltage

• AEC-Q100 compliant

• Package: SOIC-14, 4.96mm*4.40mm

Product Advantage

Supports five constant current & constant voltage power topologies

Boost, Buck, Buck-Boost, SEPIC, FLYBACK.

Maximum input voltage up to 60V

Can support 12V/24V system.

Has separate enable and error pins

The enable pin can help users reduce system power consumption; the error pin can convey the fault signal to the main controller in a timely manner. Setting the error pin independently will not affect the normal operation of the chip's dimming function.

Support high-precision digital dimming

The dimming method is flexible and supports external PWM dimming and internal PWM dimming. Adjustment of the duty cycle and frequency of the built-in dimming can be achieved by simply changing the external resistor and capacitor values without the involvement of the MCU, saving MCU resources.

Support multi-purpose analog dimming

The dimming pin is controlled by the MCU; the MCU can directly provide an analog voltage input, or it can output a PWM signal to the pin through an external RC filter.

The dimming pin is directly connected to the system input voltage, and the output current will decrease as the input voltage decreases, which can reduce input current loss.

The dimming pin is connected to the chip's internal 5V LDO output through an external voltage divider resistor. On the one hand, it can save MCU resources, and on the other hand, the voltage divider resistor can be thermally adjusted using a thermistor.

Supports complete diagnostic and protection functions

Built-in soft start function

SWO begins to build until Comp reaches its highest level

Built-in soft start time 1ms

Support spread spectrum function

By dispersing the narrow-band harmonic peak energy into multiple frequency bands in the spread spectrum region to reduce the peak energy, the EMI performance in the low-frequency range can be greatly optimized, thereby relaxing the strict requirements for input and output filtering and saving system costs.

When the FREQ pin resistance is set to 1.8K-12K,

The frequency shaking function appears, and the frequency shaking function exits when the resistance is greater than 18K.

The frequency jitter amplitude is 600mV±100mV; the frequency jitter frequency is 7KHZ±15%

As the number of LED lamp beads increases and the current increases, the power of some high and low beam lamps reaches more than 100W. Diowei's drive products specially designed for high-power high- and low-beam lamps in automotive applications will be launched soon, so stay tuned!

About DiAoWei (688381.SH)

Jiangsu Diao Microelectronics Co., Ltd. is an integrated circuit design company specializing in the R&D, design and sales of high-performance analog chips. The core management team comes from Fairchild Semiconductor, all with more than fifteen years of experience. working experience.

Diao Micro's products are mainly divided into two series: signal chain analog chips and power management analog chips, which are mainly used in automotive electronics, consumer electronics, communication equipment, industry and medical equipment and other fields. With excellent technical strength, product performance and customer service capabilities, the company's products have entered the supply chain system of many well-known end customers, such as BYD, OPPO, Xiaomi, VIVO, Qualcomm, Google, Samsung, etc.

Since its establishment, Diao Micro has always adhered to the business strategy of coordinated development of "all product business lines" and continues to provide customers with high-speed, high-performance, low-power, and stable-quality analog chip products.

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