LT8391AHUFD#TRPBF Application Field and Working Principle

The LT8391AHUFD#TRPBF is a power management integrated circuit (PMIC) that is designed to drive one or more light emitting diodes (LEDs) with a constant current source. It can provide up to 8 channels of constant current, with a current range from 5 mA to 1000 mA. The LED driver is suitable for automotive, industrial, and general LED lighting applications.

The LT8391AHUFD#TRPBF is a high-efficiency, low-cost LED driver solution for LED lighting designs. It operates with a minimum of components and requires no external components. It supports a voltage input range of 10 V to 45 V and features output over-voltage and open-circuit protection.

The LT8391AHUFD#TRPBF supports a wide range of LED current levels, from 5 mA to 1000 mA, and is designed with a low voltage drop and low quiescent current so that it can be used in high-power applications. It is also designed to provide a high PWM dimming range of 0 to 100%.

The LT8391AHUFD#TRPBF is designed with an adjustable current control for each channel. It also includes a low ripple PWM to control the LED brightness. The PWM duty cycle is adjustable from 0% to 100%.

The LT8391AHUFD#TRPBF is a thermally efficient and cost-effective PMIC for driving high-brightness LEDs. It can operate at temperatures as low as -40°C, making it suitable for automotive and industrial applications.

Working Principle

The LT8391AHUFD#TRPBF is a high-efficiency, low-cost PMIC designed to drive one or more LEDs with a constant current source. It requires minimal external components, and features adjustable current control for each channel and low ripple PWM control to adjust the LED brightness. The device is designed to operate over a wide voltage input range of 10 V to 45 V, and also features output over-voltage and open-circuit protection.

The LT8391AHUFD#TRPBF uses current-mode control to regulate the LED current. The current is regulated by an internal current sense resistor connected across the sense nodes. The sense nodes are connected to an internal error amplifier, which is used to compare the sensed current with the internal reference voltage. If the sensed current is higher than the reference voltage, the error signal causes the output to reduce, and if the sensed current is lower than the reference voltage, the error signal causes the output to increase.

The LT8391AHUFD#TRPBF also includes a low ripple PWM to adjust the LED brightness. The PWM is used to modulate the output of the LED driver in order to control the LED brightness. The PWM duty cycle is adjustable from 0% to 100%. The device also features adjustable current control for each channel, allowing the user to adjust the LED current level.

Conclusion

The LT8391AHUFD#TRPBF is a high-efficiency, low-cost PMIC designed to drive one or more LEDs with a constant current source. It features adjustable current control for each channel and low ripple PWM control to adjust the LED brightness. The device operates over a wide voltage input range of 10V to 45V, and is suitable for automotive, industrial, and general LED lighting applications.