Fairchild FEBFL7701_L31H008A, User Manual

Page 1: ...1 FEBFL7701_L31H008A Rev 1 0 2 User Guide for FEBFL7701_L31H008A 7 8 W LED Ballast Using FL7701 Featured Fairchild Product FL7701 Direct questions or comments about this evaluation board to Worldwide...

Page 2: ...ematic 8 6 Bill of Materials 9 7 Inductor Design 10 8 Performance of Evaluation Board 11 8 1 Typical Waveforms Startup 12 8 2 Operating Frequency Minimum Duty 13 8 3 Typical Waveforms Steady State 14...

Page 3: ...ching MOSFET The special adopted digital technique automatically detects input voltage condition and sends an internal reference signal resulting in high Power Factor PF When AC input voltage is appli...

Page 4: ...in for stable IC operation ZCD signal detection and used for accurate PFC function 4 RT RT Programmable operating frequency using an external resistor The IC has a fixed frequency when this pin is ope...

Page 5: ...tput Power 7 8 W Efficiency 78 At Full Load Temperature TFL7701 72 C At Full Load all at open frame room temperature still air TMOSFET 60 C TDIODE 66 C TINDUCTOR 58 C THV RESISTOR 67 C PCB Size 20 mm...

Page 6: ...uctor Corporation 6 FEBFL7701_L31H008A Rev 1 0 2 3 Photographs of the Evaluation Board Figure 2 Top View PCB 28 mmx52 mmx18 mm Figure 3 Top View 28 mm x 52 mm x 18 mm Mounted Housing Figure 4 Side Vie...

Page 7: ...2012 Fairchild Semiconductor Corporation 7 FEBFL7701_L31H008A Rev 1 0 2 4 Printed Circuit Board Figure 5 Top Side Figure 6 Bottom Side...

Page 8: ...A Rev 1 0 2 5 Schematic D1 ES3J Fuse 1A 250V C1 33nF 630V C2 47nF 630V L1 15mH R3 510R R1 560R U1 CS OUT VCC RT HV NV GND ADIM L2 10mH L3 5 5mH D2 1N4148 R4 2 4R Q1 FQN1N60C C4 1 F C3 100pF R6 OPEN BD...

Page 9: ...t 7 C4 C1206C105K3PACTU 1 1 F 25 V SMD Capacitor 3216 Kemet 8 C5 C1206C102JBGACTU 1 1 nF 630 V SMD Capacitor 3216 Kemet 9 Q1 FQD1N60C 1 1 A 600 V D PAK Fairchild Semiconductor 10 D1 ES3J 1 3 A 600 V U...

Page 10: ...Design Follow Safe Standard Inductor Core EE1614 TDK N1 280 Turns Inductance Value 1 6 5 5 mH Figure 8 Transformer Structure Table 3 Inductor Specification No Winding Pin S F Wire Turns Winding Metho...

Page 11: ...ondition Equipments Test Temperature TA 25 C Test Equipment AC Source PCR500L by Kikusui Power Meter PZ4000 by Yokogawa Oscilloscope waverunner 64Xi by Lecroy EMI Test Receiver ESCS30 by ROHDE SCHWARZ...

Page 12: ...operates in AC Mode after finishing an internally fixed seven cycle soft start period Figure 11 and Figure 12 show the soft start characteristics when a DC input voltage is applied CH1 VCC CH2 VDRAIN...

Page 13: ...ixed minimum typical on time of 400 ns There are two crucial points to design properly The first is consideration of the minimum duty ratio at minimum input voltage because the FL7701 is limited to 50...

Page 14: ...rtain output level with 120 Hz ripple as shown in the test results in the Table 5 CH1 VCC CH2 VDRAIN CH3 VLED CH4 ILED Figure 14 Input Voltage 187 VAC Input Frequency 47 Hz CH1 VCC CH2 VDRAIN CH3 VLED...

Page 15: ...Input Frequency 47 Hz H1 VCC CH2 VDRAIN CH3 VLED CH4 ILED Figure 19 Input Voltage 264 VAC Input Frequency 64 Hz Table 5 Output Characteristics by Input Voltage Frequency 47 Hz 64 Hz VLED RMS ILED RMS...

Page 16: ...disconnects from the system the IC cannot operate because the HV pin is disconnected OPEN D1 ES3J Fuse 1A 250V C1 33nF 630V C2 47nF 630V L1 15mH R3 510R R1 560R U1 CS OUT VCC RT HV NV GND ADIM L2 10m...

Page 17: ...Figure 22 and Figure 23 show the test method and result of an inductor short The FL7701 uses an abnormal over current protection AOCP function limiting the current on RCS in the event of an inductor...

Page 18: ...em efficiency results for different AC input voltage frequency conditions As shown the input frequency has negligible effect on system efficiency Figure 24 System Efficiency Table 6 Test Results Input...

Page 19: ...for the entire input voltage range 187 V to 264 V at different input frequency conditions 47 Hz 64 Hz The PF changes slightly according to the input frequency but can achieve over 86 at 264 VAC condit...

Page 20: ...the Total Harmonic Discharge THD performance at different input frequencies Test results are quite similar but meet international regulations under 30 Figure 26 Total Harmonic Discharge Performance T...

Page 21: ...de of the PCB due to power loss associated with the high voltage device The IC temperature is 66 5 C for the 220 VAC input condition Figure 27 Bottom Side Temperature at 187 VAC Condition IC Figure 28...

Page 22: ...Temperature at 264 VAC Condition Inductor Table 9 Temperature Performance by Input Voltage IC MOSFET Diode Inductor HV Resistor 187 VAC 56 0 C 63 6 C 61 1 C 48 2 C 60 6 C 220 VAC 66 5 C 55 0 C 64 2 C...

Page 23: ...measurements were conducted in observance of CISPR22 criteria which has stricter limits than to CISPR15 for lighting applications Figure 33 Conducted Emission Line at 220 VAC Input Condition Full Loa...

Page 24: ...r use provided in the labeling can be reasonably expected to result in significant injury to the user 2 A critical component is any component of a life support device or system whose failure to perfor...