FL7930 FAIRCHILD [Fairchild Semiconductor], FL7930 Datasheet
FL7930
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FL7930 Summary of contents
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... FL7930CMX © 2011 Fairchild Semiconductor Corporation FL7930 • Rev. 1.0.0 Description The FL7930 is an active Power Factor Correction (PFC) controller for low-to high-power lumens applications that operate in Critical Conduction Mode (CRM). It uses a voltage-mode PWM that compares an internal ramp signal with the error amplifier output to generate a MOSFET turn-off signal ...
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... Application Diagrams Figure 1. Typical Boost PFC Application for FL7930B Figure 2. Typical Application of Single-Stage Flyback Converter for FL7930B Line Filter AC INPUT Figure 3. Typical Boost PFC Application for FL7930C © 2011 Fairchild Semiconductor Corporation FL7930 • Rev. 1.0.0 FL7930B 1 8 INV ...
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... Internal Block Diagram © 2011 Fairchild Semiconductor Corporation FL7930 • Rev. 1.0.0 Figure 4. Functional Block Diagram for FL7930B Figure 5. Functional Block Diagram for FL7930C 3 www.fairchildsemi.com ...
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... This pin is the inverting input of the error amplifier. The output voltage of the boost PFC 1 INV converter should be resistively divided to 2.5V. FL7930B: This pin is used to detect PFC output over-voltage when INV pin information is not OVP correct. 2 FL7930C: This pin is used to detect PFC output-voltage reaching a pre-determined value. ...
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... Thermal Impedance Symbol Thermal Resistance, Junction-to-Ambient JA Note: 3. Regarding the test environment and PCB type, please refer to JESD51-2 and JESD51-10. © 2011 Fairchild Semiconductor Corporation FL7930 • Rev. 1.0.0 Parameter > <-0. Human Body Model, JESD22-A114 Charged Device Model, JESD22-C101 ...
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... Maximum On-Time Programming 1 T ON,MAX1 t Maximum On-Time Programming 2 ON,MAX2 Current-Sense Section Current-Sense Input Threshold V CS Voltage Limit I Input Bias Current CS,BS t Current-Sense Delay to Output CS,D © 2011 Fairchild Semiconductor Corporation FL7930 • Rev. 1.0.0 Condition V Increasing CC V Decreasing CC I =20mA -0.2V CC START Output Not Switching ...
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... Maximum Output Voltage O,MAX V Output Voltage with UVLO Activated O,UVLO Restart / Maximum Switching Frequency Limit Section t Restart Timer Delay RST f Maximum Switching Frequency MAX RDY Pin (FL7930C Only) I Output Sink Current RDY,SK V Output Saturation Voltage RDY,SAT I Output Leakage Current RDY,LK Soft-Start Timer Section (4) ...
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... Comparison of FL6961, FL7930B, and FL7930C Function FL6961 OVP Pin None PFC Ready Pin None Frequency Limit None AC Absent None Detection Soft-Start and Startup without None Overshoot Control Range None Compensation THD Optimizer External TSD None Comparison of FL7930B and FL7930C Function FL7930B ...
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... Typical Performance Characteristics Figure 7. Voltage Feedback Input Threshold Figure 9. Stop Threshold Voltage (V Figure 11. Operating Supply Current (I © 2011 Fairchild Semiconductor Corporation FL7930 • Rev. 1.0.0 ) Figure 8. Start Threshold Voltage (V REF1 ) vs. T Figure 10. Startup Supply Current (I STOP A ) vs. T Figure 12. Output Upper Clamp Voltage (V ...
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... Figure 13. Zero Duty Cycle Output Voltage (V vs Figure 15. Maximum On-Time Program Figure 17. Input High Clamp Voltage (V © 2011 Fairchild Semiconductor Corporation FL7930 • Rev. 1.0.0 ) Figure 14. Maximum On-Time Program 1 (t EAZ ) Figure 16. Current Sense Input Threshold Voltage Limit ON,MAX2 ) vs. T Figure 18 ...
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... Typical Performance Characteristics Figure 19. Output Voltage High (V Figure 21. Restart Timer Delay (t Figure 23. Output Saturation Voltage (V © 2011 Fairchild Semiconductor Corporation FL7930 • Rev. 1.0.0 ) vs. T Figure 20. Output Voltage Low ( vs. T Figure 22. OVP Threshold at OVP Pin (V RST A ) vs. T Figure 24. OVP Threshold Voltage (V ...
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... IC. The IC operating current decreases to reduce power consumption if the IC is disabled. Figure 27 is the timing chart of the internal circuit near the INV pin when rated-PFC output voltage is assumed at 390V V supply voltage is 15V. CC © 2011 Fairchild Semiconductor Corporation FL7930 • Rev. 1.0 PFC CC exceeds V , 20mA ...
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... INV pin or to ground. Figure 28. Comparison of First and Second OVP Recovery Modes 4. RDY Output: The FL7930C provides a PFC-ready pin that can be used to trigger other power stages when PFC output voltage reaches the proper level with hysteresis. When the INV voltage is higher than 2.24V, RDY out is triggered HIGH and lasts until the INV voltage is lower than 2 ...
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... To avoid this, maximum switching frequency limitation is embedded. If ZCD signal is applied again within 3.3μs after the previous rising edge of the gate signal, this signal is ignored internally and FL7930 waits for another ZCD signal. This slightly degrades performance at light load and high input voltage ...
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... Figure 36. Control Circuit Unlike a conventional voltage-mode PWM controller, FL7930 turns on the MOSFET at the falling edge of ZCD signal. On instance is decided by the external signal and the turn-on time lasts until the error amplifier output (V ) and sawtooth waveform meet. When COMP load is heavy, output voltage decreases, scaled output ...
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... This operation is better when soft-start time is very long; however, too much startup time enlarges the output voltage building time at light load. FL7930 has less overshoot prevention at startup. During startup, the feedback loop is controlled by an internal proportional gain controller ...
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... Near the zero cross, lengthened turn-on time improves THD performance. 11. Input Voltage Absent Detection: To save power loss caused by input voltage-sensing resistors and to optimize THD, FL7930 omits AC input voltage detection. Therefore, no information about AC input is available from the internal controller. In many cases, the V PFC controller is supplied by an independent power source, like standby power ...
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... An internal RC filter of 40kΩ and 8pF is included to filter switching noise. 13. Gate Driver Output: FL7930 contains a single totem-pole output stage designed for a direct drive of the power MOSFET. The drive output is capable +500/-800mA peak current with a typical rise and fall time of 50ns with 1nF load ...
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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/. © 2011 Fairchild Semiconductor Corporation FL7930 • Rev. 1.0 1.75 4 ...
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... Fairchild Semiconductor Corporation FL7930 • Rev. 1.0.0 20 www.fairchildsemi.com ...