FAN6208 Fairchild Semiconductor, FAN6208 Datasheet
FAN6208
Available stocks
Related parts for FAN6208
FAN6208 Summary of contents
Page 1
... FAN6208 measures the SR conduction time of each switching cycle by monitoring the drain-to-source voltage of each SR and determines the optimal timing of the SR gate drive. FAN6208 uses the change of opto-coupler diode current to adaptively shrink the duration of SR gate drive signals during load transients to prevent shoot-through ...
Page 2
... Application Diagram Block Diagram © 2010 Fairchild Semiconductor Corporation FAN6208 • Rev. 1.0.1 Figure 1. Typical Application Figure 2. Block Diagram 2 www.fairchildsemi.com ...
Page 3
... Driver Output. The totem-pole output driver for driving the SR MOSFET2. 7 GND Ground 8 GATE1 Driver Output. The totem-pole output driver for driving the SR MOSFET1. © 2010 Fairchild Semiconductor Corporation FAN6208 • Rev. 1.0.1 F- Fairchild Logo Z- Plant Code X- Year Code Y- Week Code TT: Die Run Code T - Package Type (M = SOP Green Package M - Manufacture Flow Code Figure 3 ...
Page 4
... The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol T Operating Ambient Temperature A © 2010 Fairchild Semiconductor Corporation FAN6208 • Rev. 1.0.1 Parameter Parameter 4 Min. Max. Unit 30 ...
Page 5
... DETL LOW Time t Threshold for Green Mode DET(L)_Green_HF1 t at High-Frequency DET(L)_Green_HF2 Operation Thermal Shutdown Shutdown Temperature T SHUTDOWN Hysteresis Startup Temperature T STARTUP © 2010 Fairchild Semiconductor Corporation FAN6208 • Rev. 1.0.1 Conditions Min. V TH-OFF V =12V, DETL=50KHz, DD 7.0 C =6nF, R =24K =12V, DETL=100KHz 2.4 ...
Page 6
... DETL HIGH-to-LOW t Debounce Time for Gate DB Turn-on Trigger Gate Shrink by DETL t SHRINK-RNG Ringing around Zero DETL Pull-HIGH Time t Green_DH Threshold for Green Mode © 2010 Fairchild Semiconductor Corporation FAN6208 • Rev. 1.0.1 Conditions Min. V =20V =12V; I =100mA =12V; I =100mA ...
Page 7
... RP Source Current Open Protect RPO V RP Short Protect RPS t RP Open/Short Debounce RPOS V H/L Frequency Threshold RPHL Figure Curve for LF Mode DEAD DETL © 2010 Fairchild Semiconductor Corporation FAN6208 • Rev. 1.0.1 Conditions Min 200 12 38.5 3 ...
Page 8
... Timing Estimator Figure 10 shows the timing diagram for FAN6208. Once the body diode of SR begins conducting, the drain-to- source voltage drops to zero, which causes DETL pin voltage to drop to zero. FAN6208 turns on the MOSFET after t ON-ON-DETL drops below 2V. As depicted in Figure 11, the turn-on delay (after t (150ns) and propagation delay (200ns) ...
Page 9
... Figure 12. Figure 12. Gate Shrink by Minimum Dead Time (b) When the feedback information changes fast. FAN6208 monitors the current through the opto- coupler diode by measuring the voltage across the resistor in series with the opto-coupler diode, as depicted in Figure 13. If the feedback current ...
Page 10
... The RP pin programs the level of green mode and t Figure 16 shows how the mode is selected by the voltage on the RP pin (open protection, short protection, and HF/LF mode). When R FAN6208 operates in low-frequency mode. Green mode is enabled when t is smaller than 3.75µs. When R DETL is larger than 36KΩ, high-frequency mode is selected and green mode is enabled for t be also adjusted by a resistor on the RP pin ...
Page 11
... Switching frequency increases in LLC topology at light- load condition, which increases the power consumption for the SR gate drive. Green mode reduces power loss at light load. FAN6208 has two ways to enable green mode. Green mode is triggered when DETL voltage is pulled LOW for less than 3.75µs (LF mode) or 1.90µs (HF mode) for seven switching cycles ...
Page 12
... Typical Performance Characteristics Figure 20. V TH_ON1 Figure 22. V TH_OFF1 Figure 24. I DD_ST © 2010 Fairchild Semiconductor Corporation FAN6208 • Rev. 1.0 Figure 21. V vs. T TH_ON2 A Figure 23. V vs. T TH_OFF2 A Figure 25. I vs. T DD_OP1 A www.fairchildsemi.com ...
Page 13
... Typical Performance Characteristics Figure 26. t SR_ON_DETL1 Figure 28. V Figure 30. V DETL1 © 2010 Fairchild Semiconductor Corporation FAN6208 • Rev. 1.0.1 (Continued Figure 27. t vs. T SR_ON_DETL2 A Figure 29 Figure 31. V vs. T DETL2 A www.fairchildsemi.com ...
Page 14
... Typical Performance Characteristics Figure 32. t DW1 Figure 34. V SHRINK_DT1 Figure 36. I DETL_Source1 © 2010 Fairchild Semiconductor Corporation FAN6208 • Rev. 1.0.1 (Continued Figure 33. t vs. T DW2 A Figure 35. V vs. T SHRINK_DT2 A Figure 37. I vs. T DETL_Source2 A www.fairchildsemi.com ...
Page 15
... Typical Performance Characteristics Figure 38 DEAD1 RP Figure 40 =43k, 2.5µs) vs. T DEAD1 RP Figure 42 © 2010 Fairchild Semiconductor Corporation FAN6208 • Rev. 1.0.1 (Continued) =20k, 6µ Figure 39 =20k, 6µs) vs. T DEAD2 RP Figure 41 =43k, 2.5µs) vs. T DEAD2 RP Figure 43 ...
Page 16
... Typical Application Circuit (LLC Converter with SR) Application Fairchild Devices FAN7621 TV Power FAN6208 © 2010 Fairchild Semiconductor Corporation FAN6208 • Rev. 1.0.1 Input Voltage Range 350~400V DC Figure 44. Application Circuit 16 Output 24V/8A www.fairchildsemi.com ...
Page 17
... 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/. © 2010 Fairchild Semiconductor Corporation FAN6208 • Rev. 1.0 ...
Page 18
... Fairchild Semiconductor Corporation FAN6208 • Rev. 1.0.1 18 www.fairchildsemi.com ...