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MCP1664 датащи(PDF) 17 Page - Microchip Technology

номер детали MCP1664
подробное описание детали  MCP1664 LED Driver Evaluation Board
PDF  28 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP1664 датащи(HTML) 17 Page - Microchip Technology

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Installation and Operation
 2015 Microchip Technology Inc.
DS50002363A-page 17
The R1 and R2 resistors affect not only the operating frequency but also the amplitude
of the triangular wave. Considering the maximum voltage of the triangular waves
(VTH) and the minimum voltage of the triangular waves (VTL), the amplitude swing and
the threshold voltages can be calculated by means of the following equation:
EQUATION 2-3:
TRIANGULAR WAVE AMPLITUDE SWING
For the MCP1664 LED Driver Evaluation Board, the components were chosen so that
they feature a PWM Dimming frequency of 125 Hz and an amplitude swing from
5% VDD to 95% VDD.
FIGURE 2-5:
Obtaining the Dimming Signal - 84% Duty Cycle.
VTH VTL
–
R4
R2
------VDD
=
Where: R4 <R2
REFERENCE
VOLTAGE
DIMMING
SIGNAL
TRIANGULAR
WAVE



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