STEVAL-TLL008V2 Camera flash with SuperCap daughterboard based on the STCF04 Data brief Features 1.8 MHz buck-boost converter with 1.2 A peak Current limiting and synchronous rectification Programmable current limit Burst mode operation when output is charged Selectable 200 mA / 400 mA SuperCap charging current Input voltage range 2.7 V to 5.5 V Programmable output charging voltage up to 5.5 V 2 Full I C control Controlled LED current in all modes Shorted LED failure detection and protection RoHS compliant Description The STEVAL-TLL008V2 demonstration board is a daughterboard working in conjunction with the STEVAL-TLL008V1 and was designed to demonstrate the performance of the STCF04 device, which is a buck-boost converter with an 2 I C interface dedicated to charging a SuperCap. All LEDs with a forward voltage range from 2.5 V to 5 V are compatible with the STCF04. The forward voltage spread of any selected LED must, however, be within this range (2.5 V to 5 V). It is possible to set the level of the LED current in Flash mode and torch mode by setting the dimming registers. The maximum level of the LED current in Flash mode can be set by changing the external flash resistor. June 2012 Doc ID 023187 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Obsolete Product(s) - Obsolete Product(s)(E 4 3 3 XX *0 2).4 OTRANS ISTOR C .4 4 2 2 2 2 3 3 . 2X 2& 4/2 4/ &, &, 2% 2% 2 4 4 4 2 34 & 3 3 )/ 2% 2% U& 07 07 OUT 6 6/ 06 *0 6, , Schematic diagram STEVAL-TLL008V2 1 Schematic diagram Figure 1. Schematic diagram &6 & + & + & + & , 2 + .(34, ,, ON .4 62%& K 28 ,% K 6-) 54 )3%.3 )%6 .4 /. ,3 . ,3) OHPT 8 6, % ,8 & 3 8 6, U& 4 3 4 4 9 , . 43% 3 ( ( 3 , . %34 3( ( 2 E RAD 9 9 2% . , , 3(& . 4/2 ( %32%4 & 4 60 4 U & , - V 2/4 Doc ID 023187 Rev 1 Obsolete Product(s) - Obsolete Product(s) 88 0 06 07 07 N 06 . 0 . 0 . 5