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FAN400ANY Folha de dados(PDF) 10 Page - Fairchild Semiconductor

Nome de Peças FAN400ANY
Descrição Electrónicos  Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback
Download  15 Pages
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Fabricante Electrônico  FAIRCHILD [Fairchild Semiconductor]
Página de início  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN400ANY Folha de dados(HTML) 10 Page - Fairchild Semiconductor

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© 2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN400A Rev. 1.0.1
10
Operation Description (Continued)
Slope Compensation
The sensed voltage across the current sense resistor is
used for current mode control and pulse-by-pulse
current limiting. The built-in slope compensation
improves power supply stability. Furthermore, it
prevents sub-harmonic oscillations that normally would
occur because of peak current mode control. A
positively sloped, synchronized ramp is activated with
every switching cycle. The slope of the ramp is:
Duty(max.)
Duty
0.33
×
(1)
Noise Immunity
Noise from the current sense or the control signal may
cause significant pulse-width jitter, particularly in
continuous-conduction mode. Slope compensation
helps alleviate this problem. Good placement and
layout practices should be followed. The designer
should avoid long PCB traces and component leads.
Compensation and filter components should be located
near the FAN400A. Finally, increasing the power-MOS
gate resistance is advised.


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