company blog about ADI LT8356IUDCM-1 LED Controller With Exponential PWM And Scalable Dimming

ADI LT8356IUDCM-1 LED Controller With Exponential PWM And Scalable Dimming

LT8356IUDCM-1 is a DC/DC controller designed to drive high current LEDs. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. A voltage feedback pin serves as the input for several LED protection features and makes it possible for the converter to operate as a constant-voltage source. The LT8356IUDCM-1 can implement boost, boost-to-battery, buck-mode, SEPIC, and flyback LED drivers.

The LT8356IUDCM-1 senses output current at the high or low side of the load. The product of CTRL and IADJ inputs provides analog programming of the output current. The PWM input and PWMTG high side PMOS driver provides precision time-based LED dimming capability. When driven by an external digital signal, the PWM input provides LED dimming ratios of up to 20,000:1 at 100Hz. When driven by a constant voltage, the PWM input selects from one of 128 internally generated, precision, exponentially spaced dimming ratios ranging from 0.78% up to 100%.

Features Of LT8356IUDCM-1
128:1 Internal Exponential PWM Dimming
Two-Pin Multiplying Analog Dimming
Internal Spread Spectrum Frequency Modulation
20,000:1 External PWM Dimming at 100Hz
Rail-to-Rail LED Current Sensing: 0V to 120V
±2% LED Current Regulation
±2% Output Voltage Regulation
LED Short/Open Protection and Indication
Wide Input Voltage Range (5V to 100V)
PMOS Switch Driver for PWM and Output Disconnect
Constant-Voltage and Constant-Current Regulation
Adjustable Switching Frequency Up to 2MHz
Programmable VIN UVLO with Hysteresis
Side Solderable 20-Lead 3mm × 4mm QFN Package
AEC-Q100 Qualified for Automotive Applications

Application Of LT8356IUDCM-1
High Voltage LED Applications
Automotive Head Lamps/Running Lamps
Accurate Current Limited Voltage Regulator