The controller features up to four strings of LEDs, each with a consistent drive current, minimal deviation, and high efficiency.
The LM3464 controller is a National Semiconductor PowerWise® energy-efficient series that maximizes system efficiency and streamlines system design, reducing development costs, especially for lighting systems that require large numbers of LED drivers, such as industrial lighting systems. , street lights and car lighting systems.
Traditional high-brightness LED drivers provide separate drive currents for each string of LEDs.
The LM3464 LED driver is completely different from these drives. The chip's four output channels, each capable of driving up to 20 LEDs, streamline system design and reduce development costs.
The LM3464 controller chip has dynamic voltage adjustment control function, which can flexibly adjust the LED supply voltage according to the feedback voltage to ensure that the power required by the LED is maintained at the lowest level, thereby maximizing system efficiency.
National's LM3464 LED Driver -- Technical Specifications The LM3464 is a high voltage current controller with 4 independent current regulator channels.
This controller, combined with an N-channel MOSFET and sense resistor, provides a consistent drive current for each string of LEDs. Suitable for an extremely wide input voltage range, the LM3464 can drive multiple LEDs in series with input voltages up to 80V, making it ideal for lighting systems that require a large number of LEDs.
This controller chip has a thermal feedback function to prevent the LED from operating in an excessively high temperature environment and greatly reduce the light output of the LED or greatly shorten its life.
If the temperature is too high, the thermal feedback function ensures that it operates within a safe operating temperature range by lowering the LED drive current until the junction temperature of the LED drops. This feature can be set by the user to ensure that the system manages the heat generated internally more effectively, which helps to improve the stability of the system.
In addition, the product ensures that the life of the LED and the amount of light output are not affected when there is any change in the ambient temperature of the luminaire.
Because the LM3464 controller chip has dynamic voltage adjustment control function, it can monitor the forward voltage of the series LED and flexibly adjust the LED supply voltage according to the feedback voltage to ensure that the power required by the LED is maintained at the lowest level.
In addition, this chip can directly control the output of the offline regulator, so there is no need to add a second-stage switching regulator like the offline LED power supply .
The LM3464 chip has built-in support for pulse width modulation (PWM) control and analog dimming. It can select the corresponding dimming method according to different application requirements of customers.
In addition, the chip has additional protection features such as input undervoltage lockout, LED open/short protection, and signal transfer to transmit high temperature fault signals back to the system controller.
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