BCW33LT1 데이터 시트보기 (PDF) - Motorola => Freescale

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BCW33LT1

General Purpose Transistors

Motorola => Freescale 

BCW33LT1

104

VCC = 30 Vdc

103

102

ICEO

101

100

ICBO

AND

10–1

ICEX @ VBE(off) = 3.0 Vdc

10–2

–4 –2

00

0 + 20 + 40 + 60 + 80 + 100 + 120 + 140 + 160

TJ, JUNCTION TEMPERATURE (°C)

Figure 16A.

DESIGN NOTE: USE OF THERMAL RESPONSE DATA

A train of periodical power pulses can be represented by the model

as shown in Figure 16A. Using the model and the device thermal

response the normalized effective transient thermal resistance of

Figure 16 was calculated for various duty cycles.

To find ZθJA(t), multiply the value obtained from Figure 16 by the

steady state value RθJA.

Example:

The MPS3904 is dissipating 2.0 watts peak under the following

conditions:

t1 = 1.0 ms, t2 = 5.0 ms. (D = 0.2)

Using Figure 16 at a pulse width of 1.0 ms and D = 0.2, the reading of

r(t) is 0.22.

The peak rise in junction temperature is therefore

∆T = r(t) x P(pk) x RθJA = 0.22 x 2.0 x 200 = 88°C.

For more information, see AN–569.

6

Motorola Small–Signal Transistors, FETs and Diodes Device Data

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