PM6675STR datasheet(47/53 Pages) STMICROELECTRONICS

tên linh kiện	PM6675STR

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

PDF	53 Pages

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nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

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47 / 53 page

PM6675S

Application information

47/53

8.1.7

All ceramic capacitors application

Design of external feedback network depends on the output voltage ripple across the output

capacitors ESR. If the ripple is great enough (at least 20 mV), the compensation network

simply consists of a CINT capacitor.

Figure 49.

Integrative compensation

The stability of the system firstly depends on the output capacitor zero frequency. It must be

verified that:

Equation 49

where k is a free design parameter greater than unity (k > 3) . It determines the minimum

integrator capacitor value CINT:

Equation 50

If the ripple on the COMP pin is greater than the integrator output dynamic (150 mV), an

additional capacitor Cfilt could be added in order to reduce its amplitude. If q is the desired

attenuation factor of the output ripple, select:

CFILT

CINT

RINT

VREF

VSNS

Ton One-shot

generator

Vr=0.9

PWM

Comparator

COMP

VOUT

Integrator

VREF

0.6V

out

Zout

⋅

Vref

Zout

INT

⋅

⎟

⎠

⎞

⎜

⎝

⎛

−

⋅

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