www.fairchildsemi.com
3.Designed Solution 3.1 Schematic
R1
5.6Ω 
1W
C1
0.1µF
F1
1A, 250V
C6
0.01µF
IC2
FOD817A 
LF1 |
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2 |
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| R2 |
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| T1 |
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| C2 | 22kΩ | C3 |
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| EFD20 Core/Bobbin |
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| 47µF | 2010 | 1000pF |
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3 |
| BD1 |
| 450V | R3 | 1kV |
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| DF10S |
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| 22kΩ |
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| 2010 |
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| Lm = 610µH | 2 |
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| D1 |
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| RS1M |
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| R4 |
| 3 |
| C14 |
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| 10Ω |
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| R19 | Prov. for 0805 |
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| 1206 | TP1 |
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| Prov. for 2010 |
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| R5 |
| R6 |
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| L1 |
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| 150kΩ | 150kΩ |
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| 2 | ||
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| D4 |
| 2.2µH | TP4 |
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| 2010 | 2010 |
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| R7 |
| Q1 |
| C15 | SS39 |
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| FQD2N80 |
| 100pF | 8 |
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| 5 | |||
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| 22Ω |
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| 0805 |
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| C11 | C12 |
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| R21 | 1000µF | 47µF | R14 |
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| R8 |
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| 47Ω |
| 16V | 50V | 1.8Ω, 2010 | JP1 | J2 | |||
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| 10kΩ |
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| 2010 |
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| 0603 |
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| D2 |
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| R15 |
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| Prov. for MMBD4148 | ZD2 |
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| 2Ω, 2010 |
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| Prov. for |
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| JP2 |
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| TP3 |
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| Q3 |
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| MMBT2222A |
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| R9 |
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| TP5 |
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| D3 |
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| R18 | R16 |
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| BAS21 | 4.7Ω |
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| C5 |
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| 100Ω | 1.8Ω |
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| 0805 |
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| 0.1µF |
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| 0603 | 2010 |
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| C4 |
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| R20 | 47µF |
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| TP6 |
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| ZD1 | 1kΩ | 50V |
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| RTH1 |
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8 | 7 | 6 | 5 | 18 V | 2010 |
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| TP2 |
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| 10kΩ |
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| IC2 |
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| 0805 |
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Vref | Vcc | Drive | GND |
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| C13 | FOD817A |
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| 2200pF |
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R10 |
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10kΩ | FAN7554D |
| IC1 |
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| R17 |
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1% |
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| Q2 | 510Ω |
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0603 |
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| MMBT2222AK | 0603 |
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FB | S/S | IS | Rt/Ct |
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1 | 2 | 3 | 4 |
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| R11 |
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| 1kΩ | R12 |
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| 0805 |
| R13 |
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C7 |
| C8 |
| C9 |
| C10 | 1.2Ω |
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| Prov. for 2512 |
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0.1µF |
| 1µF |
| 1800pF |
| 470pF |
| 2512 |
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Figure 3: Schematic of the FEB157 Offline High Brightness LED Driver Board
© 2007 Fairchild Semiconductor | Page 7 of 17 | Rev 1.1 April 2007 |