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FAN6753 データシート(PDF) 10 Page - Fairchild Semiconductor |
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FAN6753 データシート(HTML) 10 Page - Fairchild Semiconductor |
10 / 12 page © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6753 • Rev. 1.0.1 10 Functional Description (Continued) Limited Power Control The feedback (FB) voltage increases every time the output of the power supply is shorted or overloaded. If the FB voltage remains higher than a built-in threshold for longer than tD-OLP, PWM output is turned off. As PWM output is turned off, VDD begins decreasing. When VDD goes below the turn-off threshold (~9.5V), the controller is totally shut down. VDD is charged up to the turn-on threshold voltage of 15.5V through the startup resistor until PWM output is restarted. This protection feature continues as long as the overloading condition persists. Noise Immunity Noise on the current sense or 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. Avoiding long PCB traces and component leads, locating compensation and filter components near the FAN6753, and increasing the power MOS gate resistance also improve performance. Over-Temperature Protection (Internal OTP) The built-in temperature-sensing circuit shuts down PWM output once the junction temperature exceeds 135°C. While PWM output is shut down, VDD gradually drops to the UVLO voltage (around 7.5V). Then VDD charges up to the startup threshold voltage of 15.5V through the startup resistor until PWM output is restarted. This “hiccup” mode protection occurs repeatedly as long as the temperature remains above 130°C. The temperature hysteresis window for the OTP circuit is 25°C. |
同様の部品番号 - FAN6753 |
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同様の説明 - FAN6753 |
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