1N5283 Просмотр технического описания (PDF) - Motorola => Freescale

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производитель

1N5283

CURRENT REGULATOR DIODES

Motorola => Freescale 

1N5283 through 1N5314

5

4 ZK @ VK

3

2

1

0

–20

IP & ZT @ VT

VL @ IL

POV

–40

–60

–80

–100

–2

REVERSE

FORWARD

+

ANODE

–

CATHODE

–1 0 20 40 60 80 100 120 140 160

VAK, ANODE-CATHODE VOLTAGE (VOLTS)

Figure 1. Typical Current Regulator

Characteristics

300

250

200

POINT OF LEAD TEMPERATURE

MEASUREMENT

150

100

50

0

L

L

(MOST HEAT CONDUCTION IS

THROUGH THE CATHODE LEAD)

0.2

0.4

0.6

0.8

1

L, LEAD LENGTH (INCHES)

Figure 2. Typical Thermal Resistance

10

7

5

TJ = 25°C

POV = 100 V

3

2 (DATA OBTAINED

FROM PULSE TESTS)

1

0.7

0.5

0.3

0.2

SYMBOLS AND DEFINITIONS

ID — Diode Current.

IL — Limiting Current: 80% of IP minimum used to determine

Limiting voltage, VL.

IP — Pinch-off Current: Regulator current at specified Test

Voltage, VT.

POV — Peak Operating Voltage: Maximum voltage to be applied

to device.

θl — Current Temperature Coefficient.

VAK — Anode-to-cathode Voltage.

VK — Knee Impedance Test Voltage: Specified voltage used to

establish Knee Impedance, ZK.

VL — Limiting Voltage: Measured at IL, VL, together with Knee

AC Impedance, ZK, indicates the Knee characteristics of

the device.

VT — Test Voltage: Voltage at which IP and ZT are specified.

ZK — Knee AC Impedance at Test Voltage: To test for ZK, a 90

Hz signal VK with RMS value equal to 10% of test voltage,

VK, is superimposed on VK:

ZK = VK/iK

where iK is the resultant ac current due to VK.

To provide the most constant current from the diode, ZK

should be as high as possible; therefore, a minimum value

of ZK is specified.

ZT — AC Impedance at Test Voltage: Specified as a minimum

value. To test for ZT, a 90 Hz signal with RMS value equal

to 10% of Test Voltage VT, is superimposed on VT.

APPLICATION NOTE

As the current available from the diode is temperature dependent,

it is necessary to determine junction temperature, TJ, under specific

operating conditions to calculate the value of the diode current. The

following procedure is recommended:

Lead Temperature, TL, shall be determined from:

TL = θLA PD + TA

where θLA is lead-to-ambient thermal resistance

and PD is power dissipation.

θLA is generally 30–40°C/W for the various clips and tie points

in common use, and for printed circuit-board wiring.

Junction Temperature, TJ, shall be calculated from:

TJ = TL + θJL PD

where θJL is taken from Figure 2.

For circuit design limits of VAK, limits of PD may be estimated and

extremes of TJ may be computed. Using the information on Figures

4 and 5, changes in current may be found. To improve current

regulation, keep VAK low to reduce PD and keep the leads short,

especially the cathode lead, to reduce θJL.

1N5313

1N5309

1N5305

1N5298

1N5290

0.1

0.1

0.2 0.3

0.5 0.7 1

2

3

5 7 10

VAK, ANODE-CATHODE VOLTAGE (VOLTS)

Figure 3. Typical Forward Characteristics

20

30

50 70 100

1.5 Watt DC Power Data Sheet

9-4

Motorola TVS/Zener Device Data

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