Communication-concepts 2N5194 Bedienungsanleitung PDF herunterladen (Seite 5)

2N5194, 2N5195

http://onsemi.com

Figure 12. Thermal Response

t, TIME OR PULSE WIDTH (ms)

1.0

0.01

0.7

0.5

0.3

0.2

0.1

0.07

0.05

0.03

0.02

0.02 0.03

r(t), EFFECTIVE TRANSIENT

THERMAL RESISTANCE (NORMALIZED)

0.05 0.1 0.2 0.3 0.5 1.0 2.0 3.0 5.0 10 20 30 50 100 200 300 1000500

JC(max)

= 3.12°C/W

D = 0.5

0.2

0.05

0.02

0.01

SINGLE PULSE

0.1

DESIGN NOTE: USE OF TRANSIENT THERMAL RESISTANCE DATA

1/f

DUTY CYCLE, D = t

f =

PEAK PULSE POWER = P

Figure 13.

A train of periodical power pulses can be represented by

the model shown in Figure 13. Using the model and the

device thermal response, the normalized effective transient

thermal resistance of Figure 12 was calculated for various

duty cycles.

To find q

(t), multiply the value obtained from Figure 12

by the steady state value q

Example:

The 2N5193 is dissipating 50 watts under the following

conditions: t

= 0.1 ms, t

= 0.5 ms. (D = 0.2).

Using Figure 12, at a pulse width of 0.1 ms and D = 0.2,

the reading of r(t

, D) is 0.27.

The peak rise in junction temperature is therefore:

DT = r(t) x P

x q

= 0.27 x 50 x 3.12 = 42.2_C

1 2 3 4 5 6

Kommentare zu diesen Handbüchern

Keine Kommentare

Communication-concepts 2N5194 Bedienungsanleitung Seite 5

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Hardware Communication-concepts 2N5194