Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 13 views

    Diode Specification Sheets

    Uploaded by

    sayed Tamir jan
    1. Diode specification sheets provide critical electrical parameters like forward voltage, maximum forward current, reverse saturation current, and reverse voltage rating. 2. Additional specifications may include maximum power dissipation, capacitance, recovery time, and operating temperature range. 3. Diode testing involves checking the forward and reverse bias characteristics using a meter or curve tracer to evaluate electrical parameters. 4. Zener diodes have a controlled avalanche breakdown region used for voltage regulation. Their zener voltage is sensitive to temperature changes. 5. Light emitting diodes (LEDs) convert electrical energy directly into light through electroluminescence in materials like gallium arsen

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Diode Specification Sheets

    Uploaded by

    sayed Tamir jan
    13 views35 pages
    1. Diode specification sheets provide critical electrical parameters like forward voltage, maximum forward current, reverse saturation current, and reverse voltage rating. 2. Additional specifications may include maximum power dissipation, capacitance, recovery time, and operating temperature range. 3. Diode testing involves checking the forward and reverse bias characteristics using a meter or curve tracer to evaluate electrical parameters. 4. Zener diodes have a controlled avalanche breakdown region used for voltage regulation. Their zener voltage is sensitive to temperature changes. 5. Light emitting diodes (LEDs) convert electrical energy directly into light through electroluminescence in materials like gallium arsen

    Original Description:

    ELECTRONICS

    Original Title

    Lecture_6

    Copyright

    © © All Rights Reserved

    Available Formats

    PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    1. Diode specification sheets provide critical electrical parameters like forward voltage, maximum forward current, reverse saturation current, and reverse voltage rating. 2. Additional specifications may include maximum power dissipation, capacitance, recovery time, and operating temperature range. 3. Diode testing involves checking the forward and reverse bias characteristics using a meter or curve tracer to evaluate electrical parameters. 4. Zener diodes have a controlled avalanche breakdown region used for voltage regulation. Their zener voltage is sensitive to temperature changes. 5. Light emitting diodes (LEDs) convert electrical energy directly into light through electroluminescence in materials like gallium arsen

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    13 views35 pages

    Diode Specification Sheets

    Uploaded by

    sayed Tamir jan
    1. Diode specification sheets provide critical electrical parameters like forward voltage, maximum forward current, reverse saturation current, and reverse voltage rating. 2. Additional specifications may include maximum power dissipation, capacitance, recovery time, and operating temperature range. 3. Diode testing involves checking the forward and reverse bias characteristics using a meter or curve tracer to evaluate electrical parameters. 4. Zener diodes have a controlled avalanche breakdown region used for voltage regulation. Their zener voltage is sensitive to temperature changes. 5. Light emitting diodes (LEDs) convert electrical energy directly into light through electroluminescence in materials like gallium arsen

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 35

    DIODE SPECIFICATION SHEETS

    1.The forward voltage VF (at a specified current and temp.)


    • The max forward current IF(at a specified temp.)
    temp )
    • The reverse saturation current IR (at a specified voltage and current)
    • The reverse-voltage rating [PIV or PRV or V(BR), where BR comes
    from the term “breakdown” (at a specified temp)]
    • The max power dissipation level at a particular temp
    p
    • Capacitance levels
    • Recovery time trr
    • Operating temp range
    Additional data may related to
    Frequency range, noise level, switching time, thermal resistance level,
    peak repetitive values.

    5
    8
    5
    9
    C D

    6
    0
    E

    6
    1
    F

    6
    Terminal characteristics of a high-voltage diode. (Continued) 2
    G H

    6
    Terminal characteristics of a high-voltage diode. 3
    SEMICONDUCTOR DIODE NOTATION
    64
    Various types of junction diodes. [(a) Courtesy of Motorola Inc.; and (b) and (c) Courtesy International Rectifier
    Corporation.]

    65
    DIODE TESTING

    http://www.inotek.com/Catalog/flu
    ke1et.html
    6
    Digital display meter with diode checking capability. 6
    DIODE TESTING  Diode Checking Function 67

    Checking a diode in the forward-bias state.


    DIODE TESTING  Ohmmeter Testing 68

    Checking a diode with an ohmmeter.


    DIODE TESTING  Curve Tracer 69

    Curve tracer. (Courtesy of Tektronix, Inc.)


    DIODE TESTING (Curve Tracer) 70

    Curve tracer response to IN4007 silicon diode.


    ZENER DIODES 71

    Conduction direction: (a) Zener diode; (b) semiconductor diode.


    ZENER DIODES
    • Location of Zener Region can be controlled by varying the
    doping level.

    • Z
    Zener diodes
    di d are available
    il bl with
    i h zener potentials
    i l 1.8V
    1 8V to 200V
    with power rating from 1/4W to 50W.

    • Zener diode is ideal with straight vertical line at zener potential.

    7
    2
    ZENER DIODES 73
    Electrical characteristics for a 10-V, 500-mW 74

    Zener diode

    IZT = Current
    C ddefined b 1/4th power level.
    fi d by l l

    The Zener potential of a Zener diode is very sensitive to the temp of operation.
    The temp coefficient can be used to find the change in Zener potential due to a
    change in temp V / V
    TC  Z Z
     100 % / C
    T1  T0
    Where      TT1 is the new temp level           T
    Where is the new temp level is room temp in an enclosed cabinet (250C)
    T0 is room temp in an enclosed cabinet (25
    Tc is the temp coefficient 
    VZ is the nominal Zener potential at 25 0C
    Electrical characteristics for a 10-V, 75

    500-mW
    500 mW Zener diode
    Example 1.4
    76

    Analyze the 10 V diode, if the temp is increased to 1000C.


    ZENER DIODES 77

    Zener terminal identification and symbols.


    Home work
    P-48 to 53

    7
    8
    LIGHT-EMITTING DIODES
    79

     In Si and Ge diode the greater percentage of the energy


    converted during recombination at the junction is dissipated in
    the form of heat within the structure, and the emitted light is
    insignificant.
     Diode constructed of GaAs emit light in the infrared (invisible)
    zone during the recombination process at the p-n junction.
    LIGHT-EMITTING DIODES
    80

    The frequency
    Th f spectrum
    t f infrared
    for i f d light
    li ht extends
    t d from
    f about
    b t 100
    THz(T=1012) to 400 THz, with the visible light spectrum extending
    from about 400 to 750 THz.

    c = 3*108 m/s (the speed of light in a vacuum)


    c
     f = Frequency in hertz
    f λ = Wavelength in meters
    LIGHT-EMITTING DIODES 81

    (a) Process of electroluminescence in the LED; (b) graphic symbol.


    LIGHT-EMITTING DIODES
    82

    Eg , λ and f

    Standard response curve of the human eye, showing the eye’s response to
    light energy peaks at green and falls off for blue and red
    FIGURE 1-60a-c Hewlett-Packard subminiature high-efficiency red solid-state lamp: (a) appearance; (b) absolute
    maximum ratings; (c) electrical/optical characteristics. (Courtesy Hewlett-Packard Corporation.)

    8
    3
    Hewlett-Packard subminiature high-efficiency red solid-state lamp: relative intensity
    versus wavelength (Courtesy Hewlett-Packard Corporation.)

    8
    4
    Hewlett-Packard subminiature high-efficiency red solid-state lamp: forward current
    versus forward voltage (Courtesy Hewlett-Packard Corporation.)

    8
    5
    Hewlett-Packard subminiature high-efficiency red solid-state lamp: relative luminous intensity
    versus forward current (Courtesy Hewlett-Packard Corporation.)

    8
    6
    Hewlett-Packard subminiature high-efficiency red solid-state lamp: relative efficiency versus peak
    current (Courtesy Hewlett-Packard Corporation.)

    8
    7
    Hewlett-Packard subminiature high-efficiency red solid-state lamp: relative luminous intensity
    versus angular displacement (Courtesy Hewlett-Packard Corporation.)

    (h)
    8
    8
    LIGHT-EMITTING DIODES
    89

    • Reverse Breakdown Voltage: 3V to 10V


    – Protective approach required
    • For many years the available colors were green, yellow,
    orange and red permitting the use of average values of
    VF=2V andd IF=20mA for f obtaining
    b i i the
    h approximate
    i
    operating level.
    • Introduction
    I t d ti off bluebl in
    i early
    l 90s
    90 andd White
    Whit ini late
    l t 90s
    90
    – White: VF=4V and IF=20mA
    – Blue : VF=5V and IF=20mA
    • Today most white LEDs are constructed by a blue GaN
    LED below a film of Yettrium Aluminium Garnet
    phosphor (Yellow)
    White LED
    90

    Applications
    Challenges
    Future

    LED spotlight using 38 individual diodes for mains


    voltage power
    Seven Segment Display. 91
    Home work
    P-54 to 58

    9
    2

    You might also like