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BUL743
High voltage fast-switching NPN power transistor
BUL743High voltage fast-switching
NPN power transistor
Features Low spread of dynamic parameters High voltage capability Minimum lot-to-lot spread for reliable operation Very high switching speed
Applications Electronic ballast for fluorescent lighting up to
256 W (8 x 32 W) Switch mode power supplies
DescriptionThe device is manufactured using the diffused
collector in planar technology adopting new and
enhanced high voltage structure. It has an
intrinsic ruggedness which enables the transistor
to withstand an high collector current level during
breakdown condition, without using the transil
protection usually necessary in typical converters
for lamp ballast.
Figure 1. Internal schematic diagram
Table 1. Device summary
Electrical ratings BUL743
1 Electrical ratings
Table 2. Absolute maximum ratings
Table 3. Thermal data
BUL743 Electrical characteristics
2 Electrical characteristics(Tcase = 25 °C unless otherwise specified)
Table 4. Electrical characteristics Pulsed duration = 300 µs, duty cycle ≤ 1.5%
Electrical characteristics BUL743
2.1 Electrical characteristics (curves)
Figure 2. Safe operating area Figure 3. Derating curve
Figure 4. DC current gain (VCE = 3 V) Figure 5. DC current gain (VCE = 5 V)
Figure 6. Collector-emitter saturation
voltage
Figure 7. Base-emitter saturation voltage
BUL743 Electrical characteristics
Figure 8. Output characteristics Figure 9. Reverse biased safe operating area
Figure 10. Resistive load switching time (on) Figure 11. Resistive load switching time (off)
Electrical characteristics BUL743
2.2 Test circuits
Figure 12. Energy rating test circuit
Figure 13. Resistive load switching test circuit Fast electronic switch Non-inductive resistor
