LED2001 datasheet(13/42 Pages) STMICROELECTRONICS

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DocID024346 Rev 1

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LED2001

Application notes

Equation 2

Equation 3

where:

Equation 4

Sn represents the slope of the sensed inductor current, Se the slope of the external ramp

(VPP peak-to-peak amplitude) that implements the slope compensation to avoid sub-

harmonic oscillations at duty cycle over 50%.

The sampling effect contribution FH(s) is:

Equation 5

where:

Equation 6

and

Equation 7

6.3

Error amplifier compensation network

The LED2001 embeds (see Figure 6) the error amplifier and a pre-defined compensation

network which is effective in stabilizing the system in most application conditions.

ESR C

OUT

⋅

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

LOAD

OUT

⋅

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

–

() 0.5

–

⋅

OUT

⋅⋅

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

------

⋅

OUT

–

------------------------------ Ri

⋅







H s

()

⋅

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

------

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

π f

⋅

π m

–

() 0.5

–

⋅

[]

⋅

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

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