FT870??

1
FT870??

• ?????????

Fremont Micro Devices, Inc.
??????????????? ?????????????309? TEL[phone]
116 61557118 FAX[phone] ?????
13924660875 http//ledpower.b2b.youboy.com
Oct, 2008
2
????LED???FT870
500V??, ????,???

• ??HV???500V??,????,?????
• ??????VCC??,????13??
• ???? LED ??,??5
• ??????EMI,?????
• ???????????????????????

????????
3
FT870????
AC??
PFC
?????
Vcc???? ???? ????13
4
FT870-LED??????

• ???buck????,??????
• ?????????LED?
• ?????PFC????,?????PF?,????,??????
• VCC???????,????????,?????
• ???????????EMI???
• ????,????,????????,????,PWM??????????

5
LED?????

1. ??3W20W
2. ?????AC85265
3. PFC0.9
4. ??90
5. ???? 5
6. ??lt20

6
?????????????
?? ?? PF
3W 80 90
7W 89 90
9W 89 91
12W 90 90
15W 92 88
18W 92 88
7
85265VAC 18W?????
Demo Board
8
LED???
18W LED Tube
50000????? ?????45W??
LED??F 5mm ???????
9
85265VAC 18W?????
????

• ??gt85
• PF?gt75
• ????lt 5
• ??????,????

????
???? ????
?????????????
10
85265VAC 18W?????
?????
11
85265VAC 18W?????
???????????
???PFC????????,??????????? Buck???????????????
????50
VLED(max) v2 VIN/4
??VIN85265VAC,??VLED(max)30V ??8?LED??,38?????
??
12
85265VAC 18W?????
PFC?????
120V
70V
LED Current
????????,?PFC??????LED??????
13
85265VAC 18W?????
????
LED????8?38? ?304?LED LED?????23V25V
LED????650mA ??LED??17mA ????18W
14
85265VAC 18W?????
85265VAC???8688
?? vs VIN
15
85265VAC 18W?????
85265VAC????
LED???? vs VIN
16
85265VAC 18W?????
85265VAC?????
LED???? vs VIN
17
85265VAC 18W?????
85265VAC PF?????
PF vs VIN
18
85265VAC 18W?????
?????
??LED?????,Vf??,??LED? ????,??????????????
??LED?????????? L2????????VCC??????12V,?????
19
85265VAC 18W?????
RefDes DESCRIPTION QTY PACKAGE MANUFA CTURE MANUFACTURES PART NUMBER
B1 400V, 1A single phase diode bridge 1 DF-S STS DB104S
C1 0.1µF, 300VAC EMI suppression capacitor 1 Radial
C2,C3 47µF, 250V electrolytic capacitor 1 Radial
C4,C5,C8 1nF, 25V ceramic chip capacitor 1 SMD0805
C6 100pF ceramic chip capacitor 1 SMD0805
C7 4.7µF,50V electrolytic capacitor 1 Radial
D1,D2,D3 1000V, 1A diode 1 DO-214 1N4007
D4 600V, 1A ultrafast diode 1 DO-214AA ON Semi MUR160T3
D5 600V, 1A ultrafast diode 1 DO-41 ON Semi MURS160T3
D6 12V,0.5WZener diode 1 DO-35
F1 1A ,250VAC fuse 1 Axial
L1 0.8mH, 700mA rms, 1.1A sat inductor 2 Radial HaiRuiDa
L2 4.7uH, 700mA rms,1A sat inductor 1 Radial
Q1 600V,4A, N-channel FET 1 TO-220 4N60
R5 22K?, 1/8Wchip resistor 1 SMD0805
R6 1.2?, 1/8Wchip resistor 2 SMD0805
R7 100? top adjust trimpot 1 SOT-23
U1 Universal LED Driver 1 SOP8 FMD FT870B
?????
20
???????