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FAN6753 датащи(PDF) 7 Page - Fairchild Semiconductor |
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FAN6753 датащи(HTML) 7 Page - Fairchild Semiconductor |
7 / 9 page AN-6755 APPLICATION NOTE © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.2 • 1/14/11 7 Overload / Open-Loop Protection (OLP) When output is overloaded, the drain current reaches its pulse-by-pulse current limit level, limiting the input power. Then, the output voltage drops and no current flows through the opto-diode, which causes the feedback voltage to increase above the OLP protection threshold (4.6V). This behavior is similar to when the feedback loop is open and no current flows through the opto-diode. When the feedback voltage is higher than 4.6V longer than the OLP delay time, the OLP protection is triggered, as shown in Figure 17. VLimit Sense pin signal Cycle by cycle current limit VFB-OLP VFB-OPEN tOLP FB pin signal Figure 17. OLP Behavior VDD Over-Voltage Protection (VDD_OVP) VDD over-voltage protection protects the VDD pin from damage by over-voltage. The VDD voltage rises when an open-feedback loop failure occurs. Once the VDD voltage exceeds 26V (VDD-OVP) for longer than 125µs, the FAN6755 stops switching until VDD is discharged below VDD-LH. Over-Temperature Protection (OTP) The FAN6755 has a built-in temperature sensing circuit to disable PWM output if the junction temperature exceeds 135°C. While PWM output is disabled, the VDD voltage gradually drops to the UVLO voltage (around 7.8V). Then VDD is charged up to the startup threshold voltage of 16V through the startup resistor until PWM output is restarted. This “hiccup” mode protection continues as long as the temperature remains above 135°C The temperature hysteresis window for the OTP circuit is 25°C. |
Аналогичный номер детали - FAN6753 |
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Аналогичное описание - FAN6753 |
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