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SB330 датащи(PDF) 3 Page - Fairchild Semiconductor |
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SB330 датащи(HTML) 3 Page - Fairchild Semiconductor |
3 / 12 page AN-9719 APPLICATION NOTE © 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.0 • 11/2/10 3 2.4 Constant Power Control To constantly limit the output power of the converter, high / low line compensation is included. Sensing the converter input voltage through the VIN pin, the high / low line compensation function generates a line-voltage-dependent peak-current-limit threshold voltage for constant power control, as shown in Figure 6. Figure 6. Constant Power Control 2.5 Protection Functions The FSL-series provides full protection functions to prevent the power supply and the load from being damaged. The protection features is shown in Table 1. Table 1. Protection Functions FSL127H FSL137H OVP Latch Latch OTP Latch Latch OLP Auto Restart Auto Restart VIN-H Latch Latch VIN-L Auto Restart Auto Restart 2.5.1 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 debounce time (typically 130µs) to prevent false trigger by switching noise. 2.5.2 Over-Temperature Protection (OTP) The SenseFET and the control IC integration make temperature detection of the SenseFET easier. When the junction temperature exceeds approximately 142°C, thermal shutdown is activated. 2.5.3 Overload Protection (OLP) When the upper branch of the voltage divider for the shunt regulator (KA431 shown) is open circuit, as shown in Figure 7, or an output over-current or short occurs; there is no current flowing through the opto-coupler transistor. VFB (feedback voltage) pulls up 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 7. OLP Operator |
Аналогичный номер детали - SB330 |
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Аналогичное описание - SB330 |
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