Fairchild FEB157-001 Скачать руководство пользователя страница 13

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Rev 1.1 April 2007

www.fairchildsemi.com

4.2 Efficiency

The efficiency data shown is for the converter with a load of one, two and three LEDs driven at 1A.

Figure 8: Converter Efficiency Data Plotted Against Increasing Line Input

for LED Current of 1A.

120

270

Input Voltage (V)

Efficiency (%)

1 LED @ 1 A

2 LEDs @ 1 A

3 LEDs @ 1 A

Содержание FEB157-001

Страница 1: ...www fairchildsemi com 2007 Fairchild Semiconductor Page 1 of 17 Rev 1 1 April 2007 FEB157 001 User s Guide Offline High Brightness LED Driver Evaluation Board Featured Fairchild Product FAN7554...

Страница 2: ...2 Circuit Description 3 2 Electrical Requirements 6 2 1 Input Requirements 6 2 2 Output Requirements 6 3 Designed Solution 7 3 1 Schematic 7 3 2 Transformer 8 3 3 Bill of Materials 8 3 4 Printed Circ...

Страница 3: ...below Referring to Figure 3 the input AC line voltage comes in through J1 Capacitor C1 and common mode line choke LF1 form the conducted EMI filter The dc resistance of LF1 and R1 limit the inrush cur...

Страница 4: ...is stored in the transformer while the FET is on and released to the secondary when the FET is turned off Since no transformer can be constructed with perfect coupling the network consisting of resis...

Страница 5: ...Q2 typically about 650mV the transistor will conduct collector current This current also flows through the photodiode inside the optocoupler IC2 The optocoupler will transfer this feedback informatio...

Страница 6: ...semi com 2 Electrical Requirements 2 1 Input Requirements Voltage range 90Vrms to 270Vrms Frequency 47Hz to 63Hz 2 2 Output Requirements The FEB157 board will power one two or three high brightness LE...

Страница 7: ...50V ZD1 18 V C5 0 1 F R12 1 2 2512 R11 1k 0805 D1 RS1M C3 1000pF 1kV R2 22k 2010 R3 22k 2010 R4 10 1206 C6 0 01 F R5 150k 2010 R6 150k 2010 R8 10k 0603 D2 Prov for MMBD4148 D4 SS39 C11 1000 F 16V L1 2...

Страница 8: ...C0603X7R104K50TRP 0 1 F 50V 0603 C8 NIC Components or Equivalent NMC0603X7R105K16TRP 1 0 F 16V 0603 C9 NIC Components or Equivalent NMC0603NPO182F25TRP 1800 pF 25V 0603 NPO C10 NIC Components or Equiv...

Страница 9: ...Components or Equivalent NCF100J5R6TR 5 6 1 W R2 NIC Components or Equivalent NRC50J223TR 22k 1 2 W 2010 R3 NIC Components or Equivalent NRC50J223TR 22k 1 2 W 2010 R4 NIC Components or Equivalent NRC...

Страница 10: ...r Equivalent NRC50J102TR 1k 3 4 W 2010 R21 NIC Components or Equivalent NRC50J470TR 47 3 4 W 2010 RTH1 NIC Components or Equivalent NCT08AJ104334TR 10k NTC Thermistor Beta 3340 T1 Cooper CTX0117893 EF...

Страница 11: ...007 Fairchild Semiconductor Page 11 of 17 Rev 1 1 April 2007 www fairchildsemi com Figure 5 Silkscreen Component Placement of Top Side Layer Figure 6 Silkscreen Component Placement of Bottom Side Laye...

Страница 12: ...ts 4 1 Regulation 4 1 1 Line Regulation This graph illustrates the regulation of the output current over line voltage for the three possible settings 350mA 700mA and 1A Figure 7 LED Current vs Line Vo...

Страница 13: ...ncy The efficiency data shown is for the converter with a load of one two and three LEDs driven at 1A Figure 8 Converter Efficiency Data Plotted Against Increasing Line Input for LED Current of 1A 0 1...

Страница 14: ...conductor Page 14 of 17 Rev 1 1 April 2007 www fairchildsemi com 4 3 Steady State Operation Figure 9 Steady State Waveforms at 90Vac with Three LEDs at 1A Figure 10 Steady State Waveforms at 270Vac wi...

Страница 15: ...07 www fairchildsemi com 4 4 Start up The startup profile is captured at 90Vac and 270Vac with a load of three LEDs operating at a current of 1A Figure 11 Startup Profile at 90 Vac with Three LEDs at...

Страница 16: ...rd nor this User s Guide constitute a sales contract or create any kind of warranty whether express or implied as to the applications or products involved Fairchild warranties that its products will m...

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