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HDSP-4840 Datasheet(PDF) 7 Page - AVAGO TECHNOLOGIES LIMITED |
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HDSP-4840 Datasheet(HTML) 7 Page - AVAGO TECHNOLOGIES LIMITED |
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7 / 8 page  7 Electrical/Optical These versatile bar graph arrays are composed of ten light emit- ting diodes. The light from each LED is optically stretched to form individual elements. The Red (HDSP-4820) bar graph array LEDs use a p-n junction diffused into a GaAsP epitaxial layer on a GaAs substrate. The AlGaAs Red (HLCP-J100) bar graph array LEDs use double heterojunction AlGaAs on a GaAs substrate. HER (HDSP- 4830) and Yellow (HDSP-4840) bar graph array LEDs use a GaAsP epitaxial layer on a GaP substrate. Green (HDSP-4850) bar graph array LEDs use liquid phase GaP epitaxial layer on a GaP substrate. The multicolor bar graph arrays (HDSP-4832/ 4836) have HER, Yellow, and Green LEDs in one package. These displays are designed for strobed operation. The typical forward voltage values can be scaled from Figures 5 and 11. These values should be used to calculate the current limiting resistor value and typical power consumption. Expected maxi- mum VF values for driver circuit design and maximum power dissipation may be calculated using the VFMAX models: Standard Red HDSP-4820 series VFMAX = 1.8 V + IPeak (10 Ω) For: IPeak ≥ 5 mA AlGaAs Red HLCP-J100 series VFMAX = 1.8 V + IPeak (20 Ω) For: IPeak ≤ 20 mA VFMAX = 2.0 V + IPeak (10 Ω) For: IPeak ≥ 20 mA HER (HDSP-4830) and Yellow (HDSP-4840) series VFMAX = 1.6 + IPeak (45 Ω) For: 5 mA ≤ I Peak ≤ 20 mA VFMAX = 1.75 + IPeak (38 Ω) For: IPeak ≥ 20 mA Green (HDSP-4850) series VFMAX = 2.0 + IPeak (50 Ω) For: IPeak > 5 mA Figures 4 and 10 allow the designer to calculate the luminous intensity at different peak and average currents. The following equation calculates intensity at different peak and average currents: IVAVG = (IFAVG/IFAVG DATA SHEET)hpeak)(IVDATA SHEET) Where: IVAVG is the calculated time averaged luminous intensity resulting from IFAVG. IFAVG is the desired time averaged LED current. IFAVG DATA SHEET is the data sheet test current for IVDATA SHEET. hpeak is the relative efficiency at the peak current, scaled from Figure 4 or 10. IV DATA SHEET is the data sheet luminous intensity, resulting from IFAVG DATA SHEET. For example, what is the luminous intensity of an HDSP- 4830 driven at 50 mA peak 1/5 duty factor? IFAVG = (50 mA)(0.2) = 10 mA IFAVG DATA SHEET = 10 mA hpeak = 1.3 IV DATA SHEET = 3500 µcd Therefore IVAVG = (10 mA/10 mA) (1.3)(3500 µcd) = 4550 µcd |
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Similar Description - HDSP-4840 |
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