Boost circuit based on EL7516

　　EL7516 is a boost chip that operates in 1.2MHz fixed frequency PWM mode and has a built-in 1.5A, 200mΩ MOSFET. In the electrical circuit, through DC/DC boosting effect, EL7516 converts the 2.7~5.5V input voltage into a constant output voltage of 12V . Like general PWM control chips, its FB pin sets the output voltage by selecting the resistance values ​​of R1 and R2 . It is very simple to change the constant voltage circuit of the EL7516 into a constant current circuit that drives white LEDs.