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The characteristics of the LM3402/02HV switching regulator are as follows: input voltage range? 6V ~ 75V, using the circuit layout of a buck regulator; it can provide a constant drive current for the light-emitting diode, and the feedback voltage is 200mV ; When the RON pin is at low potential, the shutdown current will be further reduced; accurate PWM brightness control; switching frequency up to 1MHz; equipped with hysteresis function and fixed on-time. Therefore, switching frequency (FSW) control can be performed over the entire input voltage range
The LM3402/02HV switching regulator pictured has a dedicated brightness control (DIM) pin, which can utilize linear as well as PWM Input signal accurately controls brightness. Lighting systems that use light-emitting diodes to emit light generally use PWM light and dark control methods to control light brightness. This brightness control method has become a commonly used standard in the industry. As long as the current of the forward light-emitting diode is adjusted, the light output of the light-emitting diode will increase or decrease in a linear manner, but the wavelength band of most of the light will shift. Some applications do not have very strict requirements on color, so linear brightness control methods are still used. However, automotive lights such as brake lights, LCD backlights, and direct display RGB light-emitting diodes have extremely strict requirements on brightness and color. Therefore, Such applications generally use PWM to control brightness.
Application diagram of LM3402/02HV switching regulator