Reverse Biased SOA

In order to saturate the power switch and reduce

conduction losses, adequate direct base current

100

transistor to turn off (retrace phase).

Most

of

the

dissipation, especially in

the

deflection application, occurs at switch-off so it is

minimizes

power

losses,

fall

time

and,

choosing the optimum negative drive. The test

circuit is illustrated in figure 1.

The values of L and C are calculated from the

following equations:

1

2

L

1

2

C

ω= 2 πf =

1

√

flyback voltage, f= frequency of oscillation during

retrace.

BASE DRIVE INFORMATION

BUH1215

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