BU808DFI STMicroelectronics, BU808DFI Datasheet - Page 4

• Manufacturer Part Number: BU808DFI
• Description: IC TRANSISTR DARL NPN ISOWATT218
• Manufacturer: STMicroelectronics

Specifications of BU808DFI

• Transistor Type: NPN - Darlington
• Current - Collector (ic) (max): 8A
• Voltage - Collector Emitter Breakdown (max): 700V
• Vce Saturation (max) @ Ib, Ic: 1.6V @ 500mA, 5A
• Current - Collector Cutoff (max): 400µA
• Dc Current Gain (hfe) (min) @ Ic, Vce: 60 @ 5A, 5V
• Power - Max: 52W
• Mounting Type: Through Hole
• Package / Case: ISOWATT-218-3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Transition: -

BU808DFI
4/7
Switching Time Inductive Load at 16KHZ
BASE DRIVE INFORMATION
In order to saturate the power switch and reduce
conduction losses, adequate direct base current
I
100
negative base current I
turn off the power transistor (retrace phase).
Most of the dissipation, in the deflection
application, occurs at switch-off. Therefore it is
essential to determine the value of I
minimizes power losses, fall time t
consequently, T
defined to give total power losses, t
function of I
frequencies for choosing the optimum negative
B1
has to be provided for the lowest gain h
o
C (line scan phase). On the other hand,
B2
j
. A new set of curves have been
at both 16 KHz scanning
B2
must be provided to
s
and t
B2
f
f
which
FE
as a
and,
at
Reverse Biased SOA
drive. The test circuit is illustrated in figure 1.
Inductance L
negative base current I
excess carrier in the collector when base current
is still present, this would avoid any tailing
phenomenon in the collector current.
The values of L and C are calculated from the
following equations:
Where I
flyback voltage, f= frequency of oscillation during
retrace.
1
2
L I
C
2
C
= operating collector current, V
1
2
C V
1
serves to control the slope of the
CEfly
2
B2
to recombine the
2 f
L
1
C
CEfly
=