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PM6675ASTR 데이터시트(PDF) 19 Page - STMicroelectronics

부품명 PM6675ASTR
상세설명  High efficiency step-down controller with embedded 2 A LDO regulator
PDF  48 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6675ASTR 데이터시트(HTML) 19 Page - STMicroelectronics

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PM6675AS
Device description
19/48
Figure 24.
Switching section simplified block diagram
7.1.2
Output ripple compensation and loop stability
The loop is closed connecting the center tap of the output divider (internally, when the fixed
output voltage is chosen, or externally, using the VSEL pin in the adjustable output voltage
mode). The feedback node is the negative input of the error comparator, while the positive
input is internally connected to the reference voltage (Vr = 0.6 V). When the feedback
voltage becomes lower than the reference voltage, the PWM comparator goes high and sets
the control logic, turning on the high-side MOSFET. After the On-Time (calculated as
previously described) the system releases the high-side MOSFET and turns-on the
synchronous rectifier.
The voltage drop along ground and supply PCB paths, used to connect the output capacitor
to the load, is a source of DC error. Further the system regulates the output voltage valley,
not the average, as shown in Figure 22. Thus, the voltage ripple on the output capacitor is
an additional source of DC error. To compensate this error, an integrative network is
introduced in the control loop, by connecting the output voltage to the COMP pin through a
capacitor (CINT) as shown in Figure 25.
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