BUW1015 datasheet(4/7 Pages) STMICROELECTRONICS

tên linh kiện	BUW1015

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Power Losses at 64 KHz

Switching Time Inductive Load at 64KHz

(see figure 2)

In order to saturate the power switch and reduce

conduction losses, adequate direct base current

IB1 has to be provided for the lowest gain hFE at Tj

= 100

oC (line scan phase). On the other hand,

negative base current IB2 must be provided the

transistor to turn off (retrace phase). Most of the

dissipation,

especially

the

deflection

application, occurs at switch-off so it is essential

to determine the value of IB2 which minimizes

power losses, fall time tf and, consequently, Tj. A

new set of curves have been defined to give total

power losses, ts and tf as a function of IB1 at 64

KHz scanning frequencies for choosing the

optimum drive. The test circuit is illustrated in

figure 1.

The values of L and C are calculated from the

following equations:

(IC)2 =

(VCEfly)2

ω = 2 πf =

√

L C

Where IC= operating collector current, VCEfly=

flyback voltage, f= frequency of oscillation during

retrace.

BASE DRIVE INFORMATION

Reverse Biased SOA

BUW1015

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