HDSP-4850 데이터 시트보기 (PDF) - Avago Technologies

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HDSP-4850

10-Element Bar Graph Array

Avago Technologies 

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 ≤ IPeak ≤ 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

7

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