LED5000 datasheet(14/52 Pages) STMICROELECTRONICS

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Application notes - buck conversion

LED5000

14/51

Doc ID 023951 Rev 1

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

5.3

Error amplifier compensation network

The external compensation network connected at the output of the error amplifier is

dimensioned to stabilize the system depending on the application conditions.

ESR

OUT

⋅

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

LOAD

OUT

⋅

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

–

() 0.5

–

⋅

OUT

⋅⋅

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

------

⋅

OUT

–

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

⋅

⎝

⎜

⎛

H s

()

⋅

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

-----

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

π f

⋅

–

() 0.5

–

⋅

[]

⋅

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

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