1N53_13 datasheet(6/7 Pages) ONSEMI

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1N53 Series

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VZ, ZENER VOLTAGE (VOLTS)

Figure 9. Zener Voltage versus Zener Current

VZ = 82 thru 200 Volts

APPLICATION NOTE

Since the actual voltage available from a given Zener

diode is temperature dependent, it is necessary to determine

junction temperature under any set of operating conditions

in order to calculate its value. The following procedure is

recommended:

Lead Temperature, TL, should be determined from:

TL = qLA PD + TA

qLA is the lead-to-ambient thermal resistance and PD is the

power dissipation.

Junction Temperature, TJ, may be found from:

TJ = TL + DTJL

DTJL is the increase in junction temperature above the lead

temperature and may be found from Figure 4 for a train of

power pulses or from Figure 1 for dc power.

DTJL = qJL PD

For worst-case design, using expected limits of IZ, limits

of PD and the extremes of TJ (DTJ) may be estimated.

Changes in voltage, VZ, can then be found from:

DV = qVZ DTJ

qVZ, the Zener voltage temperature coefficient, is found

from Figures 2 and 3.

Under high power-pulse operation, the Zener voltage will

vary with time and may also be affected significantly by the

zener resistance. For best regulation, keep current

excursions as low as possible.

Data of Figure 4 should not be used to compute surge

capability. Surge limitations are given in Figure 5. They are

lower than would be expected by considering only junction

temperature, as current crowding effects cause temperatures

to be extremely high in small spots resulting in device

degradation should the limits of Figure 5 be exceeded.

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