AN2730 is an application note about ST's STCF06 chip, which introduces how to use this chip to design a single Flash LED driver.
This application note details the design of a Flash LED driver based on the STCFO6 device, a buck-boost current mode converter featuring an I2C interface. It is specifically designed to drive a single LED with a forward voltage range of 2.7 V to 5 V. The document provides a typical application schematic and discusses the selection of external components such as capacitors, inductors, and resistors to ensure optimal performance and stability.
| Switching frequency | 1.8 MHz |
|---|---|
| LED forward voltage range | 2.7 V to 5 V |
| Maximum LED current (Flash mode) | 1.5 A |
| Maximum LED current (Torch mode) | 370 mA |
It is recommended to use 2x10 uF/6.3 V as a minimum value for the input capacitor.
The optimal value for the output capacitor is 4.7 uF/6.3 V to achieve good stability.
All Schottky diodes are compatible with the STCFO6.