LED2000PUR datasheet(13/40 Pages) STMICROELECTRONICS

Nome de Peças	LED2000PUR

Descrição Electrónicos	3 A monolithic step-down current source with synchronous rectification

PDF	40 Pages

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Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

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13 / 40 page

DocID023432 Rev 4

13/40

LED2000

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 LED2000 device 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 COUT



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



RLOAD COUT



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

mC 1D

–

 0,5

–



LCOUT fSW



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

------

Vpp fSW



VIN VOUT

–

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









FH s





n QP



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



------

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



 f



 m

–

 0,5

–







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

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