FAN6749 Fairchild Semiconductor, FAN6749 Datasheet
FAN6749
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FAN6749 Summary of contents
Page 1
... Mode and completely shuts off PWM output. Green Mode helps power supplies meet international power conservation requirements. The FAN6749 is designed for SMPS with surge-current output and incorporates a two-level Over-Current Protection (OCP) function. Besides the cycle-by-cycle current limiting, two-level OCP can handle peak loading within a specified delay time ...
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... Application Diagram Internal Block Diagram © 2012 Fairchild Semiconductor Corporation FAN6749 • Rev. 1.0.0 Figure 1. Typical Application Figure 2. Functional Block Diagram 2 www.fairchildsemi.com ...
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... Gate Drive Output. The totem-pole output driver for the power MOSFET; internally limited to 8 GATE V GATE-CLAMP © 2012 Fairchild Semiconductor Corporation FAN6749 • Rev. 1.0.0 Figure 3. Top Mark GND ...
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... Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol R HV Startup Resistor HV © 2012 Fairchild Semiconductor Corporation FAN6749 • Rev. 1.0.0 Parameter (1, 2) ＜50°C) A (3) , JEDEC:JESD22-A114 All Pins Except HV Pin ...
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... Internal Sink Current DD-OLP Threshold Voltage for V V DD-OVP Voltage Protection V Over-Voltage Protection DD t D-VDDOVP Debounce Time DD-ON GATE Normal Mode © 2012 Fairchild Semiconductor Corporation FAN6749 • Rev. 1.0.0 Conditions Limited by V OVP DD V Rising DD V Falling DD V Falling DD V Falling DD in Normal V ...
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... Switching Frequency when V OSC t Hopping Period HOP f Switching Frequency When V OSC-G f Frequency Variation vs Frequency Variation vs. Temperature Deviation T DT © 2012 Fairchild Semiconductor Corporation FAN6749 • Rev. 1.0.0 (Continued) Figure 6. V & AC Recovery DD-AC Conditions V =120V HV=500V +1V DD DD-OFF DC Source Series R=200kΩ ...
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... AC-RMS t Soft-start time SS t Debounce Time for OCP D-OCP PWM Frequency f OSC f OSC-G © 2012 Fairchild Semiconductor Corporation FAN6749 • Rev. 1.0.0 (Continued) Conditions FB Pin Open Pin, FB Voltage(V Pin, FB Voltage(V V =122V, Series R=200kΩ =366V, Series R=200kΩ =122V, Series R=200kΩ ...
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... When activated, the output is disabled and the latch is turned off. 5. The threshold temperature for enabling the output again and resetting the latch after OTP has been activated. 6. Guaranteed by design. © 2012 Fairchild Semiconductor Corporation FAN6749 • Rev. 1.0.0 (Continued) Conditions V =15V, I =50mA ...
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... Figure 9. Startup Current (I Figure 11. Start Threshold Voltage (V vs. Temperature Figure 13. Supply Current Drawn from HV Pin (I vs. Temperature Figure 15. Frequency in Normal Mode (f Temperature © 2012 Fairchild Semiconductor Corporation FAN6749 • Rev. 1.0.0 ) vs. Temperature Figure 10. Operation Supply Current (I DD-ST ) Figure 12. Minimum Operating Voltage (V DD-ON ) Figure 14. HV Pin Leakage Current After Startup ( ...
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... Over-Voltage Protection (V DD vs. Temperature Figure 21. Over-Temperature Protection Threshold Voltage (V ) vs. Temperature RTTH1 Figure 23. Brown-in (V AC-ON © 2012 Fairchild Semiconductor Corporation FAN6749 • Rev. 1.0.0 ) vs. Figure 18. Delay of FB Pin Open-Loop Protection (t FB-OLP ) Figure 20. DD-OVP Figure 22. Over-Temperature Protection Threshold ) vs. Temperature Figure 24. Brown-out (V 10 vs. Temperature Output Current from RT Pin ( ...
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... Figure 28. When AC line voltage is applied, the V hold-up capacitor is charged by the line voltage through the diodes and resistor. After V turn-on threshold voltage (V FB charging V supplied by the auxiliary winding of the transformer. Once FAN6749 starts up, it continues operation until V drops below 6. given AC line input voltage is given as: t STARTUP ...
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... Equation 2. High/Low Line Compensation for Constant Power Limit FAN6749 has cycle-by-cycle current limit, as shown in Figure 29, which limits the maximum input power with a given input voltage. If the output consumes beyond this maximum power, the dropping output voltage triggers the overload protection ...
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... V is reduced down the discharge of V until V DD This delays restart after shutdown by protection to minimize the input power and voltage/current stress of switching devices during fault condition. © 2012 Fairchild Semiconductor Corporation FAN6749 • Rev. 1.0.0 V DD-ON V DD-OFF V DD-OLP 190 230 270 ...
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... The OTP can be also trigged by pulling down the RT pin voltage using an opto-coupler or transistor. Once V less than V soft-start circuit that the protection is triggered and FAN6749 enters Latch Mode protection. When V disabled for lower power consumption. If OTP is not used, place a 100kΩ resistor between this pin and ground to prevent noise interference. ...
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... Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2012 Fairchild Semiconductor Corporation FAN6749 • Rev. 1.0.0 5.00 4.80 A 3.81 ...
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... Fairchild Semiconductor Corporation FAN6749 • Rev. 1.0.0 16 www.fairchildsemi.com ...