PM6675STR datasheet(25/53 Pages) STMICROELECTRONICS

tên linh kiện	PM6675STR

Giải thích chi tiết về linh kiện	High efficiency step-down controller with embedded 2 A LDO regulator

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nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

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25 / 53 page

PM6675S

Device description

25/53

Equation 7

where gm = 50

µs is the integrator trans conductance.

If the ripple on the COMP pin is greater than 150 mV, the auxiliary capacitor CFILT can be

added. If q is the desired attenuation factor of the output ripple, CFILT is given by:

Equation 8

In order to reduce the noise on the COMP pin, it is possible to add a resistor RINT that,

together with CINT and CFILT, becomes a low pass filter. The cutoff frequency fCUT must be

much greater (10 or more times) than the switching frequency:

Equation 9

If the ripple is very small (lower than approximately 20mV), a different compensation

network, called "Virtual-ESR" Network, is needed. This additional circuit generates a

triangular ripple that is added to the output voltage ripple at the input of the integrator. The

complete control scheme is shown in Figure 36.

Vout

Zout

INT

⋅

⎟

⎠

⎞

⎜

⎝

⎛

−

⋅

)

(

INT

FILT

−

⋅

FILT

INT

FILT

INT

CUT

INT

⋅

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