LM3433SQ

• Product introduction

peculiarity

The operating input voltage range is -9V to 14V relative to the anode of the LED
Control the anode of the input reference LED
The output current is greater than 6A
Capability for PWM frequencies greater than 30kHz
Negative output voltage capability enables the anode of the LED to connect directly to the chassis for maximum heatsink efficiency
No output capacitor is required
Up to 1MHz switching frequency
Low IQ, 1 mA typical
Soft start
Adaptive programmable on-time allows constant ripple current
LLP-24 package

illustrate

The LM3433 is an adaptive constant-time DC/DC buck (step-down) constant current controller (a true current source). The LM3433 provides a high power LED constant current for lighting. The output configuration allows multiple LED anodes to be connected directly to the ground to reference the maximum radiator efficiency of the chassis. The high frequency capability architecture while keeping the LED ripple current low allows the use of small external passive components and no output capacitance. Two control inputs are used to adjust the brightness of the LED. An analog current control input is provided that allows the LM3433 to be adjusted to compensate for variations in LED manufacturing and/or color temperature correction. The other input is a logic-level PWM that controls the LED current. Short circuits allow high PWM dimming frequencies with parallel switching of the LED's PWM function. PWM dimming at high frequencies with digital color temperature control, interference blanking, field sequence lighting and brightness control. Additional features include thermal shutdown, undervoltage lockout for VCC, and logic-level shutdown mode. The LM3433 is a low-profile LLP-24 package.

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LCD backlight
Projection system
Solid-state lighting
Automotive lighting