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SM5301AS bảng dữ liệu(PDF) 8 Page - Nippon Precision Circuits Inc

tên linh kiện SM5301AS
Giải thích chi tiết về linh kiện  3-channel Video Buffer with Built-in Wideband Filters
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nhà sản xuất  NPC [Nippon Precision Circuits Inc]
Trang chủ  http://www.npc.co.jp/en
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SM5301AS bảng dữ liệu(HTML) 8 Page - Nippon Precision Circuits Inc

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SM5301AS
NIPPON PRECISION CIRCUITS INC.—8
Adjusting the Cutoff Frequency
Constant-voltage control 1
Cutoff frequency control using a reference voltage VR generated by voltage divider formed by R1 and R2.
Constant-voltage control 2
Cutoff frequency control by adjusting the resistance connected to RFC.
PWM control
Cutoff frequency control by smoothing the PWM signal, using R1 and C1, input to VFC.
When VFC = 0.2V VDD = 3.3V, 6% duty drive
VDD = 5.0V, 4% duty drive
When VFC = 1.6V VDD = 3.3V, 48% duty drive
VDD = 5.0V, 32% duty drive
Note: The resistor connected to RFC can affect the cutoff frequency response, so a high-precision component
should be used. It is recommended to set the RC filter cutoff frequency to < fc/100 of the PWM wave-
form frequency.
VFC
VR
RFC
R1
R2
VFC
VR
RFC
VFC
RFC
R1
C1
PWM



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