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AP64100Q bảng dữ liệu(PDF) 19 Page - Diodes Incorporated

tên linh kiện AP64100Q
Giải thích chi tiết về linh kiện  AUTOMOTIVE-COMPLIANT, 40V, 1A SYNCHRONOUS BUCK WITH ADJUSTABLE FREQUENCY
PDF  26 Pages
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nhà sản xuất  DIODES [Diodes Incorporated]
Trang chủ  http://www.diodes.com
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AP64100Q bảng dữ liệu(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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