LM3434SQ

• The operating input voltage range is -9V - 30V relative to the anode of the LED
• Controls the anode of the input reference LED
• The output current is greater than 6A
• The ability to PWM frequencies greater than 30kHz
• Negative output voltage capability, enabling the anode of the LED to connect directly to the maximum heat sink of the chassis
• No output capacitors are required
• Switching frequency up to 1MHz
• Low I Q, 1 mA typical
• Soft start
• Adaptive programmable turn-on time allows for constant ripple current
• LLP - 24 Package

illustrate

The LM3434 is an adaptive constant-time DC/DC buck (step-down) constant current controller (a true current source). The LM3434 provides a high-power LED constant current for illumination. The output configuration allows multiple LEDs to be connected directly to the ground to reference the efficiency of the chassis' largest heat sink. The high-frequency capability architecture while maintaining a low LED ripple current allows for the use of small external passive components with no output capacitance. Two control inputs are used to adjust the brightness of the LEDs. An analog current-controlled input is provided that allows the LM3434 to be adjusted to compensate for changes in LED manufacturing and/or color temperature correction. The other input is a logic level PWM that controls the LED current. Short circuit allows high PWM dimming frequencies with parallel switching of the PWM function of the LEDs. High frequency of PWM dimming, digital color temperature control, interference blanking, field sequence illumination and brightness control. Additional features include thermal shutdown, undervoltage latching for V CC, and logic level shutdown mode. The LM3434 is a low-profile LLP-24 package.

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• Projection system
• Solid-state lighting
• Automotive lighting