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SG5842A Datasheet(PDF) 11 Page - Fairchild Semiconductor |
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SG5842A Datasheet(HTML) 11 Page - Fairchild Semiconductor |
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11 / 15 page  © 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com SG5842A/SG582JA • Rev. 1.4.3 11 Functional Description (Continued) 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 longer than tD- OLP, PWM output is turned off. As PWM output is turned off, the supply voltage VDD begins decreasing. ) (K I R 154 . 2 (ms) t OLP - D Ω × = (2) When VDD goes below the turn-off threshold (eg. 10.5V), the controller is totally shut down. VDD is charged up to the turn-on threshold voltage of 16.5V through the startup resistor until PWM output is restarted. This protection feature remains activated as long as the overloading condition persists. This prevents the power supply from overheating due to overloading conditions. Protection Latch Circuit The built-in latch function provides a versatile protection feature that does not require external components (see ordering information for a detailed description) . To reset the latch circuit, disconnect the AC line voltage of the power supply. Thermal Protection An external NTC thermistor can be connected from the RT pin to ground. A fixed current, IRT, is sourced from the RT pin. Because the impedance of the NTC decreases at high temperatures, when the voltage of the RT pin drops below 1.05V, PWM output is latched off. The RT pin output current is related to the PWM frequency programming resistor RI. 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. Avoid long PCB traces and component leads. Compensation and filter components should be located near the SG5842A/JA. Increasing the power-MOS gate resistance is advised. |
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