This application note focuses on the design of a flash LED driver using the STCF05 device, which is a boost current mode converter with an I²C interface and internal current source. The schematic, functional description, recommendations for PCB layout, and external component selection are also discussed in this application note. The STCF05 device is designed to drive two LEDs in series with a total forward voltage range from 5.3 V to 10.2 V.
This application note details the design of a flash LED driver circuit using the STCF05 device, a boost current mode converter featuring an I2C interface and an internal current source. The document explains how to configure the device to drive two LEDs in series with a total forward voltage ranging from 5.3 V to 10.2 V. It covers the selection of external components such as capacitors, inductors, and LEDs, as well as the implementation of thermal protection using an NTC thermistor.
| LED forward voltage range | 5.3 V to 10.2 V |
|---|---|
| Recommended input capacitor | 10 uF/6.3 V |
| Recommended output capacitor | 1 uF/16 V |
| Recommended inductor resistance | Roo = Rp/ 10 |
It is recommended to use a minimum value of 10 uF/6.3 V for the input capacitor.
The device is designed to drive two LEDs in series with a total forward voltage ranging from 5.3 V to 10.2 V.
The device has a high operational frequency of 1.8 MHz.