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AP64100Q 데이터시트(PDF) 19 Page - Diodes Incorporated

부품명 AP64100Q
상세설명  AUTOMOTIVE-COMPLIANT, 40V, 1A SYNCHRONOUS BUCK WITH ADJUSTABLE FREQUENCY
PDF  26 Pages
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제조업체  DIODES [Diodes Incorporated]
홈페이지  http://www.diodes.com
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AP64100Q 데이터시트(HTML) 19 Page - Diodes Incorporated

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AP64100Q
Document number: DS43575 Rev. 1 - 2
19 of 26
www.diodes.com
July 2021
© Diodes Incorporated
AP64100Q
Application Information (continued)
16
External Loop Compensation Design (continued)
The loop gain at the crossover frequency has unity gain. Therefore, the compensator resistance, R5, is determined by:
������������ =
������������ ∙ ������������ ∙ ������������������������ ∙ ������������ ∙ ������������
������������ ∙ ������������������
= ������. ������������������������������������[
������
������
] ∙ ������������ ∙ ������������������������ ∙ ������������������������
Eq. 17
Where:
gm is 0.15mS
RT is 0.089V/A
VFB is 0.8V
fC is the desired crossover frequency
Be aware that most ceramic capacitors will degrade with voltage stress or temperature extremes. Refer to its datasheet and use its worst case
capacitance value for calculations.
The compensation capacitors C5 and C6 are then equal to:
������������ =
������������������������ ∙ ������������������������
������������������������ ∙ ������������
Eq. 18
������������ = ������������������ (
������������ ∙ ������������
������������
,
������
������ ∙ ������������������ ∙ ������������
)
Eq. 19
Where:
IOUT is the output load current
The inclusion of C6 can increase gain margin and can decrease phase margin. In most cases, C6 is optional and may be omitted.
The zero,
z2, is optional as it can increase both the phase margin and gain bandwidth and can decrease gain margin. If used, place this zero at
around two to five times fC. Thus, C4 is in the approximate range of:
������������ = [
������
������������������ ∙ ������������ ∙ ������������
,
������
������������ ∙ ������������ ∙ ������������
]
Eq. 20



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