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SG5841J Datasheet(PDF) 11 Page - Fairchild Semiconductor |
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SG5841J Datasheet(HTML) 11 Page - Fairchild Semiconductor |
11 / 15 page © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com SG5841J • Rev. 1.3.3 11 Thermal Protection An NTC thermistor RNTC in series with a resistor RA can be connected from the RT pin to ground. A constant current IRT is output from pin RT. The voltage on the RT pin can be expressed as VRT = IRT × (RNTC + RA), in which IRT = 2 x (1.3V / RI). At high ambient temperature, RNTC is smaller, such that VRT decreases. When VRT is less than 0.62V, the PWM is completely turned off. Limited Power Control The 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, the supply voltage VDD begins decreasing. ) (K I R 115 . 1 (ms) OLP - D t Ω × = (2) When VDD goes below the turn-off threshold (e.g. 10V) the controller totally shuts down. VDD is charged up to the turn-on threshold voltage of 16V through the startup resistor until PWM output is restarted. This protection remains activated as long as the overloading condition persists. This prevents the power supply from overheating due to overloading conditions. Noise Immunity Noise on the current-sense or control signal may cause significant pulse-width jitter, particularly in the 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 SG5841/J, and increasing power MOS gate resistance improve performance. |
Similar Part No. - SG5841J_08 |
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Similar Description - SG5841J_08 |
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