PM6675STR datasheet(48/53 Pages) STMICROELECTRONICS

부품명	PM6675STR

상세설명	High efficiency step-down controller with embedded 2 A LDO regulator

PDF	53 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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48 / 53 page

Application information

PM6675S

48/53

Equation 51

In order to reduce noise on the COMP pin, it's possible to introduce 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 52

For most applications both RINT and Cfilt are unnecessary.

If the ripple is very small (e.g. such as with ceramic capacitors), a further compensation

network, called "Virtual ESR" network, is needed. This additional part generates a triangular

ripple that substitutes the ESR output voltage ripple. The complete compensation scheme is

represented in Figure 50.

Figure 50.

Virtual ESR network

Select C as shown:

Equation 53

)

(

INT

filt

−

⋅

FILT

INT

FILT

INT

CUT

INT

⋅

CFILT

CINT

RINT

PWM Comparator

1.237V

VOUT

Ton

Generation

Block

Integrator

VREF

0.6V

INT

⋅

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