Laserprojector/lasercurrentsourcev2 en

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lasercurrentsourcev2

Release status: experimental [box doku]

LasersupplySMDv1.0 top.jpg
Description 3channel currentsource
Author(s)  siro
Last Version  -
 (Siro, 16. Oct. 2011 (CET))

english version of Laserprojector/lasercurrentsourcev2.
project Laserprojector


Idea[Bearbeiten]

Tripple channel high speed digital adjustable current source for laser video applications.

requirements[Bearbeiten]

  • adjustable offset per channel
  • 30bit - true 1G colors (3 different laser diodes)
  • Hardware Gammacorrection (Rev1.1?)
  • VGA-input/HDMI input with FPGA (Sauron) (Rev1.1?)
  • more than 10MSPs
  • adjustable diode voltage to reduce power consumption
  • adjustable gain per channel 1x - 50x
  • adjustable DAC gain

Laser-diodes[Bearbeiten]

  • 20mW Red : 90mA Diode Current
  • 50mW Greeb: 350mA Diode Current
  • 450mW Blue: 600mA Diode Current

Rev 1.0[Bearbeiten]

Specification[Bearbeiten]

  • 24 V max AC/DC
  • up to 500 - 600 mA per channel TODO: messure
  • up to 1.9W power draw per channel
  • up to 330Mhz TODO: messure
  • adjustable offset per channel
  • 30bit - true 1G colors (3 different laser diodes)
  • more than 10MSPs
  • adjustable diode voltage to reduce power consumption
  • adjustable gain per channel 1x - 50x
  • adjustable DAC gain

Messured[Bearbeiten]

  • 150mA Amplitude
    • Slew Rate 6.5A/µs
    • output delay (rising Clock, dI/dt = 0) ~48ns
    • fall time 18.5 ns
    • max freq. 50Mhz

Dimension[Bearbeiten]

  • 107mm x 80mm
  • Double Layer, 0.3>mm drill, 0.15mm width

parts[Bearbeiten]

  • Induktor:
    • L-PISM 68µ
    • L-PIS2816 680µ
    • L-PIS2816 22µ
  • DC/DC converter:
    • LM2574HVM-5.0 (SIMPLE SWITCHER 5V 0.5A Step-Down Voltage Regulator)
    • LM2596TV (3.0A, 150Khz, Step-Down Switching Regulator)
  • ELKO:
    • Elko SMD-Bauform, 105°C, low ESR 10µ
    • Elko SMD-Bauform, 105°C, low ESR 47µ
    • Elko SMD-Bauform, 105°C, low ESR 220µ
  • Transistor:
    • NESG270034 (Stromspiegel)
    • MMDT3906VCDICT-ND (Bias)
  • ADC:
    • ADV7123KSTZ50-ND (Triple Channel 10bit Parallel DAC 330Msps)
  • Trimmer:
    • TRIMMER 100 OHM 0.125W SMD
    • TRIMMER 100K OHM 0.5W TH
  • rectifier:
    • DIODE SCHOTTKY 1A 60V MBS-1

Supplier[Bearbeiten]

Digikey:

9	NESG270034-T1-AZCT-ND
1	LM2574HVM-5.0-ND
1	LM2596T-ADJ-ND
1	PCE4976CT-ND 10µ
3	PCE4951CT-ND 47µ
2	PCE5009CT-ND 220µ 
1      HS287-ND Heat Sink
1      MB16S-TPMSCT-ND Rectifier
5      277-1721-ND Connectors
1      B260-FDICT-ND DIODE 
1      MBRS360BT3GOSCT-ND DIODE
3      568-4117-1-ND Diode
3      ST32ETB101CT-ND Trimmer 100
5      MMDT3906-FDICT-ND PNP Dual
5      MMDT3904-FDICT-ND NPN Dual
3      490-2895-ND TRIMMER 100K
6      P160DACT-ND 160ohm
1      RR12P681DCT-ND 681ohm
1      RHRA-1.0-ND
1      RHRA-5.0-ND
1      805F2R0E-ND
3      WSCB-2.0CT-ND

Reichelt:

1      L-PISM 68µ
1      L-PIS2816 680µ
1      L-PIS2816 22µ 
10     X7R-G0805 100N
10     X7R-G0603 100N
1      WSL 40W
5      BL 1X20G7 2,54

note: some parts may be missing

Schematics[Bearbeiten]

Powerdraw[Bearbeiten]

P(T1) = Uce * Ic = 1.8W max
Uce = Ub - (Uf(Ic) + Ic * 2)

Example:

Ub = 5V
Uf(100mA) = 2.5V
Ic = 100mA
P(T1) = Ic * (Ub - Uf(Ic) - Ic * 2)
      = Ic * Ub - Ic * Uf(Ic) - Ic^2 *2
      = 0.1A * 5V - 0.1A * 2.5V - 0.1A^2 * 2
      = 0.5W - 0.25W - 0.02W
      = 0.23W
Ub = 7V
Uf(100mA) = 2.5V
Ic = 100mA
P(T1) = Ic * (Ub - Uf(Ic) - Ic * 2)
      = Ic * Ub - Ic * Uf(Ic) - Ic^2 *2
      = 0.1A * 7V - 0.1A * 2.5V - 0.1A^2 * 2
      = 0.7W - 0.25W - 0.02W
      = 0.48W
Ub = 7V
Uf(500mA) = 2.8V
Ic = 500mA
P(T1) = Ic * (Ub - Uf(Ic) - Ic * 2)
      = Ic * Ub - Ic * Uf(Ic) - Ic^2 *2
      = 0.5A * 7V - 0.5A * 2.5V - 0.5A^2 * 2
      = 3.5W - 1.25W - 0.5W
      = 1.75W
Ub = 8V
Uf(500mA) = 2.1V
Ic = 500mA
P(T1) = Ic * (Ub - Uf(Ic) - Ic * 2)
      = Ic * Ub - Ic * Uf(Ic) - Ic^2 *2
      = 0.5A * 8V - 0.5A * 2.1V - 0.5A^2 * 2
      = 4W - 1.05W - 0.5W
      = 2.45W 
 2.45W > 1.8W : use resistor in series with Laserdiode to increase Uf(Ic) !!! 

Errors[Bearbeiten]

  • do not use NESG270034, base and collector are swap !
  • pin-header for MP2103-Stick have to wrong distance
  • one elko 10µF matches with the headsink
  • headsink is to big
  • great current after power on, init microcontroller first and set low level as soon as possible
  • A3 via ist partly connected to ground !

Rev 1.1[Bearbeiten]

Specification[Bearbeiten]

TODO

Dimension[Bearbeiten]

  • 85mm x 80mm
  • Double Layer, 0.3>mm drill, 0.15mm width

Parts[Bearbeiten]

  • Induktor:

TODO

TODO

  • ELKO:

TODO

  • Transistor:

TODO

  • ADC:
    • ADV7123KSTZ50-ND (Triple Channel 10bit Parallel DAC 330Msps)

TODO

  • Stromversorgung:
    • HEBW 25 :: Hohlstecker-Einbaubuchse, gewinkelt, Lötfahnen

TODO

Supplier[Bearbeiten]

Digikey:

TODO

Reichelt:

TODO

Schematics[Bearbeiten]

TODO