current regulator diode

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GROUP 5

6 AVIONICS 2

AZILA BT. ARZMI MUHAMMAD SYAUQI B. ZAKARIA ANWARUL IZAAN B. ANWAR NURHASNANEY BT. SULAIMAN MUHAMMAD FARIZ CHE AZIZ MUHAMMAD ZUNNUR AZEEM

SPECIAL PURPOSE DIODE(CURRENT REGULATOR DIODE)

NAME

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Introduction

History Construction and Basic Idea Equivalent Circuit and Symbol How does it work Significant Characteristic/s Applications

CURRENT REGULATOR DIODE

LOGOCURRENT REGULATOR DIODE

HISTORY OF CRDs..

First introduced in late 1960s … Many of the device were granted MIL – classification … However in the late 80s and early 90s , there were

numerous cuts in u.s military programs As a results … For that reason … Despite the problem, CRDs are still popular and

readily available in united states for the following major sources:- such as …


BASIC IDEA

CRDs are drastically different from any of the diode. CRDs maintains a relatively constant device current over a wide range of forward operating voltages.

Other purpose of CRDs is:-

To create current source. To provide a constant current regardless of changes in the

input voltage or load current. To regulate current over a wide voltage range.


CONSTRUCTION..

Today the most common diodes are made from …

It is a JFET with the gate shorted to the source, and function like …

They allow a current through them to rise to a certain value, and then level off at a specific value.

current regulator diode is also called …

Example Circuit

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Equivalent Circuit & Symbol

Constant Current Diode

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SYMBOLDIODE

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Circuit diagram

If we were to build a circuit like figure (a)

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Graft

The graft for this diodeIs figure (b)

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LOGO How Does CCD Operate?DIODE

The circuit of CCD is a currentgenerator in series with

parallel of the dynamic impendenceIn the junction capacitance.

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LOGOHow Does It WorkDIODE

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Significant Characteristics


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CHARACTERISTICS

Zk

POVVL

IP

Zt

RatingsRatings

Constant Current Diodes

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SPECIFICATIONS

POVPOVPeak Operating Voltage The maximum allowable value of Vf

(VL)(VL)Maximum Limiting Voltage The voltage at which the diode starts to limit current

(IP)(IP)Regulator Current Regulated value of forward current for forward voltages between VL & POV

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SPECIFICATIONS(cont)

Operated at the knee voltage of the

operating curve

Operated at the knee voltage of the

operating curve

Operated in the current limiting region of operation

Operated in the current limiting region of operation

MinimumDynamic

Impedance(Zt)

MinimumDynamic

Impedance(Zt)

Minimum Knee

Impedance(Zk)

Minimum Knee

Impedance(Zk)

*Minimum forward impedance of a constant current diode

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Figure 1DIODE

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LOGOApplication

Application automatically limit current through an

LED or laser diode over a wide range of power supply voltages.

charging of small secondary-cell batteries-large secondary

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LOGOConclusion

CRDs are drastically different from any of the diode.

Its maintains a relatively constant device current over a wide range of forward operating voltages.

Its allow a current through them to rise to a certain value, and then level off at a specific value.


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References

Current source and voltage references By Linden T. Harrison

2

Semiconductor Component Industries,LLC reference text book,Wikipedia & www.avtechplus.info/diode/faq

4

Integrated publishing Electrical Engineering Training Series33

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Encyclopedia special diode35

Wikipedia31

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TEAM

FRIENDS

REFERENCES

MDMNAJIHAH

THANK YOU! THANK YOU! (“,)v(“,)v

Constant Current Diode TeamDIODE

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Team best!DIODE

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current regulator diode

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