Using the LM3551 and LM3552 are fixed frequency, current mode step-up DC DC converters with two integrated NFETs we can design a very simple and high precision LED brightness control system. The devices are capable of driving loads up to 1A from a single-cell Li-Ion battery.
A simple led driver electronic project can be designed using the LM3552 white LED flash driver integrated circuit .
For this led driver electronic project you will need a DC power supply circuit that provide an output voltage between 2.7V and 5.5 volts ( supply voltage must be applied between Vin and GND .
EN jumper connects the “OFF” post to the middle post of the EN header strip. This connects GND to the EN pin of the LM3552, disabling the part.
A very simple white led driver schematic circuit can be designed using the EL7513 constant current boost regulator specially designed for driving white LEDs. It can drive 4 LEDs in series or up to 12 LEDs in parallel or series configuration and achieves efficiency up to 91%.
The brightness of the LEDs is adjusted through a voltage level on the CNTL pin.
This voltage can be either a DC or a PWM signal