TI's LM3434 is a DC/DC step-down controller that provides constant current for high-power LED lighting, operating input voltage -9V to -30V, output current 6A, M frequency greater than 30kHz, and is mainly used in projection systems, solid state lighting and automotive Lighting. This article describes the LM3434 main features, block diagram, output 10A and 20A application circuit, LM3434 20A evaluation board main features, circuit diagrams, bill of materials and PCB design drawings, and the main parameters of the RGB LED driver reference design using the LM3434 180W DLP projector, Circuit diagrams, bill of materials, and PCB design drawings. Operating Input Voltage Range of -9V to -30V wrtLED Anode Projection Systems Figure 1. Block diagram of the LM3434 Figure 2. Typical Application Circuit of LM3434 Figure 3. Application Circuit for LM3434 Output 10A Figure 4. Application Circuit for LM3434 Output 20A HVDC relay HVDC relay Ningbo Xingchuangzhi Electric Appliance Co.,Ltd. , https://www.xingchuangzhi.com
The LM3434 is an adapTIve constant on-TIme DC/DC buck (step-down) constant current controller (a true current source). The LM3434 provides a constant current for illuminaTIng high power LEDs. The output configuration allows the anodes of multiple LEDs to The high frequency capable architecture allows the use of small external passive components and no output capacitors while maintaining low LED ripple current. Two control inputs are used to modulate LED brightness. An analog The PWM control by LED current. The PWM input is provided by the current control input LM3434 can be adjusted to compensate the LED manufacturing variations and/or color temperature correction. High PWM dimming frequencies. High frequency PWM dimming allows digital color temperature control, interference blanking, field sequential illumination, and Brightness control. Additional features include thermal shutdown, VCC under-voltage lockout, and logic level shutdown mode. The LM3434 is available in a low profile 24-pin WQFN package.
Control Inputs are Referenced to the LED Anode
Output Current Greater than 6A
Greater than 30kHz PWM Frequency Capable
Negative Output Voltage Capability Allows LED Anode to be Tied Directly to Chassis for Maximum Heat Sink Efficiency
No Output Capacitor Required
Up to 1MHz Switching Frequency
Low IQ, 1mA Typical
Soft Start
Adaptive Programmable ON Time Allows for Constant Ripple Current
24-Pin WQFN Package
Solid State Lighting
Automotive Lighting 
