Automotive Exterior


PT16750

The PT16750 is a Headlight LED controller for automotive. The controller can support multiple DC-DC topologies, such as Buck, Boost, SEPIC driver topologies. The controller implements a fixed-frequency peak current mode control technique, integrated programmable switching frequency, slope compensation, and soft-start timing. It incorporates a high voltage (65 V) rail-to-rail current sense amplifier, which can directly measure LED current using a high-side series sense resistor. The amplifier is designed to achieve better current accuracy than ±3%, in the junction temperature range of 25°C to 140°C and output common-mode voltage range of 3 to 60 V.

LED current can be modulated using either analog dimming or PWM dimming techniques. Adjust IADJ input voltage from 140 mV to 2.25 V to realize linear analog dimming. PWM dimming of LED current is achieved by modulating the PWM input pin with the desired duty cycle and frequency. DDRV gate driver output can be used to enable series FET dimming functionality to get over 1000:1 contrast ratio.

The PT16750 provides current monitor function, check the LED status continuous through the IMON pin. This allows for LED short circuit or open circuit detection and protection. Additional fault protection features include VCC UVLO, output OVP, switch cycle-by-cycle current limit, and thermal protection.


FEATURES


● Automotive AEC-Q100, Grade 1 (-40℃~+125℃) Qualified.

● Input Voltage: 4.5V-65V

● Output Voltage: 3V to 65V

● LED Current Accuracy: ±3%

● High-Side Current Sense Implementations

● Analog LED Current Adjust (IADJ) With over 15:1 Contrast Ratio

● Integrated Series N-Channel dimming driver Interface, supports over 1000:1 Series FET PWM Dimming Ratio

● Programmable Switching Frequency With External Clock Synchronization Capability

● Programmable Soft-Start and Slope Compensation

● Continuous LED Current Monitor Output for System Fault Detection and Diagnoses

● Comprehensive Fault Protection Circuitry Including VCC Undervoltage Lockout (UVLO), Output Overvoltage Protection (OVP), Cycle-by-Cycle Switch Current Limit, and Thermal Protection

● Package Type-HTSSOP 16

APPLICATIONS


● Automotive Headlight LED Drive

● High-Brightness LED Applications

● Exit Signs and Emergency Lighting

資源下載

Documentation

TitleFileVersionDate
DatasheetPT16750.pdfV1.22024/6/1
SEPIC test reportPT16750 SEPIC test report_20241029.pdfRev 1.12024/10/29
SEPICPT16750_SEPIC_190226.pdf  

Tools

Application Note