1 / 16

Introduction to Prototyping a LED Driver Part I: Driver Design and Component Selectio

Introduction to Prototyping a LED Driver Part I: Driver Design and Component Selection . September 24-28, 2012 Carol Lenk. PCB Prototyping Process. Design. Schematic Capture. Layout. Manufacturing (Gerber) Files. PCB-top copper.gbr PCB-top mask.gbr

allayna
Download Presentation

Introduction to Prototyping a LED Driver Part I: Driver Design and Component Selectio

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Introduction to Prototyping a LED Driver Part I: Driver Design and Component Selection September 24-28, 2012Carol Lenk

  2. PCB Prototyping Process Design Schematic Capture Layout Manufacturing (Gerber) Files PCB-top copper.gbr PCB-top mask.gbr PCB-top silkscreen.gbr PCB-bottom copper.gbr PCB-drill data.drl PCB Layout Software Bill of Materials (BOM)

  3. Layout Software Options • Low Cost – Eagle • $69, 2-layer PCB, 100mmx80mm • Steep learning curve, uses scripts. • PCB Manufacturer Provided – PCB Artist • Can’t import or export, must order from 4pcb.com. • Can get gerbers after one PCB order. • Freeware – DesignSpark • Functionally similar to PCB Artist, but can generate gerbers. • Easy to use graphical interface. • No

  4. Boost SMPS Our book uses this circuit in a example converting 2D batteries (2.4V) to drive a single power LED (3V). • Vin < Vout • Vin max 6V. • Vin always connected to L1. • Internal transistor ON pulls SW to GND. Thus L1 current goes up, D1 is off. • Transistor OFF pulls SW above FB to turn on D1 to power LEDs and causes L1 current to go down. Practical DC Drive Circuitry for LEDs. Lenk, Ron and Carol. “Practical Lighting Design with LEDs.” Wiley, 2011.

  5. AC Example Our book uses this circuit in a example BR40 self ballasted light bulb design. • Supertex HV9910 uses external MOSFET Q1. Current controlled Buck converter. • R2 sense resistor sets current. • R1 sets the switching frequency. • When Q1 is on, D1 is off, L1 current increases. • When Q1 is off, D1 turns on, L1 current decreases. • Vin can be up to 450VDC, usable worldwide.

  6. HV9910 Demo Board The HV9910DB3v.3 can supply a maximum output current of 900mA to drive LED strings from a 9VDC to 30VDC input. It achieves an overall efficiency above 85%. The HV9910DB3v.3 is ideally suited to drive two 1Watt or 3Watt LEDs from a 12V or 24V input voltage.

  7. Demo Board Schematic

  8. Bill of Materials (BOM)

  9. Tolerance not an issue. • Narrow down by Operating Temperature, Min Qty, Click on up-arrow under Price:490-5520-1-ND

  10. Surface Mount Packages

  11. Resistors • Search: Resistor. Select: Chip Resistor-Surface Mount. • Select: 147 K, 1/10 W. • Select: Cut-tape. • 0805 is $0.86, 0603 is $0.10: P147KHCT-ND

  12. Remaining Component • Search: Schottky Diode. Select Diodes, Rectifiers, Single. • Select 40V, 1 A, SM. Sort by price: 641-1015-1-ND • Search: Power Inductor. Select: Inductor, Coils, Chokes – Fixed. • Select 220 uH, 1 A, Shielded: 513-1424-1-ND • Search: MOSFET N-Channel. Select: FETs, Single. • Select 50 V, 2.4 V to 15 V. Sort by price, pick SM: RFD14N05LSM-ND • Search: HV9910. Select: PMIC – LED Drivers. • Pick no heat pad: CLA320CT-ND

  13. Digikey Order

  14. Thank You

More Related