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FAN400ANY Folha de dados(PDF) 10 Page - Fairchild Semiconductor |
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FAN400ANY Folha de dados(HTML) 10 Page - Fairchild Semiconductor |
10 / 15 page © 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. |
Nº de peça semelhante - FAN400ANY |
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Descrição semelhante - FAN400ANY |
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