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FSL137H 데이터시트(PDF) 11 Page - Fairchild Semiconductor |
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FSL137H 데이터시트(HTML) 11 Page - Fairchild Semiconductor |
11 / 13 page © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FSL137H Rev. 1.0.0 11 Constant Power Control To limit the output power of the converter constantly, high/low line compensation is included. Sensing the converter input voltage through the VIN pin, the high/low line compensation function generates a relative peak-current-limit threshold voltage for constant power control, as shown in Figure 27. 1.2 3.6 VIN VLimit 0.80 0.65 0.5 4.0 Figure 27.Constant Power Control Protections The FSL137H provides full protection functions to prevent the power supply and the load from being damaged. The protection features include: Latch/Auto Recovery Function The FSL137H provides additional protections by the VIN pin, such as pull-HIGH latch and pull-LOW auto recovery that depend on the application. As shown in Figure 28, when VIN is higher than 4.7V, FSL137H is latched until the VDD is discharged. FSL137H is in auto recovery when VIN is lower than 0.3V. Figure 28.VIN Pin Function Open-Loop / Overload Protection (OLP) When the upper branch of the voltage divider for the shunt regulator (KA431 shown) is broken, as shown in Figure 29, or over current or output short occurs. There is no current flowing through the opto-coupler transistor, which pulls up the feedback voltage to 6V. When the feedback voltage is above 4.6V for longer than 56ms, OLP is triggered. This protection is also triggered when the SMPS output drops below the nominal value longer than 56ms due to the overload condition. Figure 29.OLP Operation VDD Over-Voltage Protection (OVP) VDD over-voltage protection prevents IC damage caused by over voltage on the VDD pin. The OVP is triggered when VDD reaches 28V. It has a debounce time (typically 130µs) to prevent false trigger by switching noise. Over-Temperature Protection (OTP) The SenseFET and the control IC are integrated, making it easier to detect the temperature of the SenseFET. When the temperature exceeds approximately 142°C, thermal shutdown is activated. |
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