STCF07 datasheet(21/26 Pages) STMICROELECTRONICS

部件名	STCF07

功能描述	High power buck-boost white LED driver

PDF	26 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

21 / 26 page

STCF07

External component selection

Doc ID 16757 Rev 3

21/26

11.5

RLC selection

RLC resistor value can be calculated with the following equations:

RLC = (160 mV - ILC * RHC) / ILC and PRLC = RLC * ILC

where PRLC is the dissipated power on the RLC resistor. It is recommended to use a thin

metal film resistor with a 1% or 5% tolerance.

11.6

NTC and RX resistor selection

The NTC resistor for sensing LED temperature and the RX resistor create a voltage divider.

The output of this divider is compared with the 1.192 V internal voltage reference. When

voltage on the output of the voltage divider is increased over the reference, the logic

switches off the power circuit. Voltage divider is possible to supply from the NTC pin, where

is output of the 1.8 V internal reference.

STCF07 数据表(PDF) 21 Page - STMicroelectronics