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FAN6753 Arkusz danych(PDF) 1 Page - Fairchild Semiconductor |
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FAN6753 Arkusz danych(HTML) 1 Page - Fairchild Semiconductor |
1 / 9 page www.fairchildsemi.com © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.2 • 1/14/11 AN-6755 Design Guideline to Replace FAN6753 with FAN6755 Introduction FAN6755 is a highly integrated PWM controller featuring green-mode, frequency hopping, constant power limit, and a number of protection functions. Green mode and burst mode function with a low operating current to maximize the light-load efficiency so the power supply can meet stringent standby power regulations. Frequency hopping reduces the Electro-Magnetic Emission (EMI) by spreading the frequency spectrum. The constant power limit function minimizes the component stress in abnormal conditions and helps optimize the power stage. Protection functions such as brownout, overload/open-loop (OLP), over-voltage (OVP), and over-temperature (OTP) are fully integrated, which improves the reliability of switched-mode power supplies (SMPS) without increasing system cost. This application note explains how to replace PWM controller FAN6753 with FAN6755. Only VIN and Latch pins are different; however, some functional improvements have been made to FAN6755 for higher efficiency, lower power consumption, and better performance. Therefore, several external components should be changed accordingly. Table 1 summarizes the differences between these two devices. The operating current is reduced to achieve lower standby power consumption, which allows less than 100mW standby power consumption for most of LCD monitor power supply designs. The typical application circuit and internal block diagram are shown in Figure 1 and Figure 2, respectively. Table 1. Comparison of FAN6753 and FAN6755 FAN6753 FAN6755 HV Pin Input Voltage 500V 700V Brownout Protection No Line Sensing Using VIN Pin Line Voltage Compensation for Pulse-by-Pulse Current Limit (V limit-L / V limit-H ) Saw-Limit (0.9V/0.56V) Adjusted by VIN Pin (0.83V/0.7V) Sense Pin Short-Circuit Protection (SCP) VSENSE<0.15V Longer than 150µs No Gate Source Current 250mA 700mA FB Impedance (Z FB ) 5KΩ 15KΩ Operating Current (I DD-OP ) 2.7mA 2mA Leading-Edge Blanking Time (t LEB ) 150ns 290ns Minimum Operating Voltage (UVLO) 9.5V 7.8V Maximum Duty Cycle 65% 75% Soft-Start (t SS ) 5.0ms 5.5ms Package 8-Pin SOP Package 7-Pin SOP Package |
Podobny numer części - FAN6753 |
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Podobny opis - FAN6753 |
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