LED6001 datasheet(15/26 Pages) STMICROELECTRONICS

部件名	LED6001

功能描述	PWM-dimmable single channel LED driver with integrated boost controlle

PDF	26 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

15 / 26 page

DocID025575 Rev 3

15/26

LED6001

Device description

In LED6001 the slope compensation is achieved by injecting a sawtooth current into the

CSNS pin. Therefore the voltage across the CSNS pin is given by:

Equation 1

vCSNS (t) = iMOS (t) RSHUNT + iSL (t)  RCSNS

The RSNS resistor is usually designed so that the peak voltage is about 15% of the

overcurrent threshold at the CSNS pin in order to have a good S/N ratio, while the RSLOPE

resistor is calculated for the desired slope compensation amount (typically at least half the

downslope of the inductor current during the switching off-time):

Equation 2

Equation 3

Where ISL = 50 µA is the maximum current injected by the slope compensation circuitry in

the CSNS pin.

Figure 6. Power switch current sensing scheme

RSNS

50mV

IL PEAK



--------------------



RSLOPE

VOUT V

–

IN min



fSW  L

----------------------------------------



RSNS

ISL

--------------



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