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MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Order this document by BUL147/D

Designer's Data Sheet

SWITCHMODE

NPN Bipolar Power Transistor

For Switching Power Supply Applications

The BUL147/BUL147F have an applications specific state±of±the±art die designed for use in electric fluorescent lamp ballasts to 180 Watts and in Switchmode Power supplies for all types of electronic equipment. These high±voltage/high±speed transistors offer the following:

•Improved Efficiency Due to Low Base Drive Requirements:

ÐHigh and Flat DC Current Gain

ÐFast Switching

ÐNo Coil Required in Base Circuit for Turn±Off (No Current Tail)

•Parametric Distributions are Tight and Consistent Lot±to±Lot

•Two Package Choices: Standard TO±220 or Isolated TO±220

•BUL147F, Isolated Case 221D, is UL Recognized to 3500 VRMS: File #E69369

MAXIMUM RATINGS

Rating

 

Symbol

BUL147

 

BUL147F

Unit

 

 

 

 

 

 

Collector±Emitter Sustaining Voltage

VCEO

 

400

Vdc

Collector±Emitter Breakdown Voltage

VCES

 

700

Vdc

Emitter±Base Voltage

 

VEBO

 

9.0

Vdc

Collector Current Ð Continuous

IC

 

8.0

Adc

Ð Peak(1)

 

ICM

 

16

 

Base Current Ð Continuous

 

IB

 

4.0

Adc

Ð Peak(1)

 

IBM

 

8.0

 

RMS Isolated Voltage(2)

Test No. 1 Per Fig. 22a

VISOL

Ð

 

4500

Volts

(for 1 sec, R.H. < 30%,

Test No. 2 Per Fig. 22b

 

Ð

 

3500

 

TC = 25°C)

Test No. 3 Per Fig. 22c

 

Ð

 

1500

 

Total Device Dissipation

(TC = 25°C)

PD

125

 

45

Watts

Derate above 25°C

 

 

1.0

 

0.36

W/°C

Operating and Storage Temperature

TJ, Tstg

± 65 to 150

°C

THERMAL CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

Rating

 

Symbol

BUL44

 

BUL44F

Unit

 

 

 

 

 

 

Thermal Resistance Ð Junction to Case

RqJC

1.0

 

2.78

°C/W

Ð Junction to Ambient

RqJA

62.5

 

62.5

 

Maximum Lead Temperature for Soldering

TL

 

260

°C

Purposes: 1/8″ from Case for 5 Seconds

 

 

 

 

 

ELECTRICAL CHARACTERISTICS (TC = 25°C unless otherwise noted)

BUL147* BUL147F*

*Motorola Preferred Device

POWER TRANSISTOR

8.0 AMPERES

700 VOLTS

45 and 125 WATTS

BUL147

CASE 221A±06

TO±220AB

BUL147F

CASE 221D±02

ISOLATED TO±220 TYPE

UL RECOGNIZED

Characteristic

Symbol

Min

Typ

Max

Unit

 

 

 

 

 

 

OFF CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

Collector±Emitter Sustaining Voltage (IC = 100 mA, L = 25 mH)

VCEO(sus)

400

Ð

Ð

Vdc

Collector Cutoff Current (VCE = Rated VCEO, IB = 0)

ICEO

Ð

Ð

100

mAdc

Collector Cutoff Current (VCE = Rated VCES, VEB = 0)

ICES

Ð

Ð

100

mAdc

(TC = 125°C)

 

Ð

Ð

500

 

Collector Cutoff Current (VCE = 500 V, VEB = 0) (TC = 125°C)

 

Ð

Ð

100

 

Emitter Cutoff Current (VEB = 9.0 Vdc, IC = 0)

IEBO

Ð

Ð

100

mAdc

(1) Pulse Test: Pulse Width = 5.0 ms, Duty Cycle ≤ 10%.

 

 

 

 

(continued)

(2) Proper strike and creepage distance must be provided.

Designer's and SWITCHMODE are trademarks of Motorola, Inc.

Designer's Data for ªWorst Caseº Conditions Ð The Designer 's Data Sheet permits the design of most circuits entirely from the information presented. SOA Limit curves Ð representing boundaries on device characteristics Ð are given to facilitate ªworst caseº design.

Preferred devices are Motorola recommended choices for future use and best overall value.

REV 1

Motorola, Inc. 1995

BUL147 BUL147F

ELECTRICAL CHARACTERISTICS Ð continued (TC = 25°C unless otherwise noted)

 

 

Characteristic

 

 

 

Symbol

 

Min

Typ

Max

Unit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Base±Emitter Saturation Voltage

(IC = 2.0 Adc, IB = 0.2 Adc)

 

VBE(sat)

 

Ð

0.82

1.1

Vdc

Base±Emitter Saturation Voltage

(IC = 4.5 Adc, IB = 0.9 Adc)

 

 

 

Ð

0.92

1.25

 

Collector±Emitter Saturation Voltage

 

 

 

VCE(sat)

 

 

 

 

Vdc

(IC = 2.0 Adc, IB = 0.2 Adc)

 

 

 

 

(TC = 125°C)

 

 

Ð

0.25

0.5

 

(IC = 4.5 Adc, IB = 0.9 Adc)

 

 

 

 

 

 

Ð

0.3

0.5

 

 

 

 

 

(TC = 125°C)

 

 

Ð

0.35

0.7

 

 

 

 

 

 

 

 

 

 

 

Ð

0.35

0.8

 

DC Current Gain

(IC = 1.0 Adc, VCE = 5.0 Vdc)

 

(TC = 125°C)

hFE

 

14

Ð

34

Ð

 

 

 

 

 

 

 

 

 

 

Ð

30

Ð

 

DC Current Gain

(IC = 4.5 Adc, VCE = 1.0 Vdc)

 

(TC = 125°C)

 

 

8.0

12

Ð

 

 

 

 

 

 

 

 

 

 

 

7.0

11

Ð

 

DC Current Gain

(IC = 2.0 Adc, VCE = 1.0 Vdc)

(TC = 25°C to 125°C)

 

 

10

18

Ð

 

DC Current Gain

(IC = 10 mAdc, VCE = 5.0 Vdc)

 

 

 

 

 

10

20

Ð

 

DYNAMIC CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Current Gain Bandwidth (IC = 0.5 Adc, VCE = 10 Vdc, f = 1.0 MHz)

fT

 

Ð

14

Ð

MHz

Output Capacitance (VCB = 10 Vdc, IE = 0, f = 1.0 MHz)

 

 

Cob

 

Ð

100

175

pF

Input Capacitance (VEB = 8.0 V)

 

 

 

 

 

Cib

 

Ð

1750

2500

pF

 

 

 

 

(IC = 2.0 Adc

 

1.0 μs

 

 

 

 

Ð

3.0

Ð

 

 

 

 

 

 

(T

= 125°C)

 

 

Ð

5.5

Ð

 

Dynamic Saturation Voltage:

 

IB1 = 200 mAdc

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ð

0.8

Ð

 

Determined 1.0 μs and

 

VCC = 300 V)

 

3.0 μs

 

 

 

 

 

 

 

(TC = 125°C)

 

 

Ð

1.4

Ð

 

3.0 μs respectively after

 

 

 

 

 

VCE(dsat)

 

Volts

rising IB1 reaches 90% of

 

(IC = 5.0 Adc

 

1.0 μs

 

 

 

Ð

3.3

Ð

 

 

 

 

 

 

 

final IB1

 

 

 

 

(T

= 125°C)

 

 

Ð

8.5

Ð

 

(see Figure 18)

 

 

 

IB1 = 0.9 Adc

 

 

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ð

0.4

Ð

 

 

 

 

 

VCC = 300 V)

 

3.0 μs

 

 

 

 

 

 

 

 

 

 

(TC = 125°C)

 

 

Ð

1.0

Ð

 

 

 

 

 

 

 

 

 

 

 

 

SWITCHING CHARACTERISTICS: Resistive Load (D.C. ≤ 10%, Pulse Width = 20 μs)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn±On Time

 

(IC = 2.0 Adc, IB1 = 0.2 Adc

(TC = 125°C)

ton

 

Ð

200

350

ns

 

 

IB2 = 1.0 Adc, VCC = 300 V)

 

 

Ð

190

Ð

 

Turn±Off Time

 

 

 

 

 

 

 

 

 

toff

 

Ð

1.0

2.5

μ

 

 

 

 

 

 

 

 

(TC = 125°C)

 

s

 

 

 

 

 

 

 

 

 

 

Ð

1.6

Ð

 

Turn±On Time

 

(IC = 4.5 Adc, IB1 = 0.9 Adc

(TC = 125°C)

ton

 

Ð

85

150

ns

 

 

IB1 = 2.25 Adc, VCC = 300 V)

 

 

Ð

100

Ð

 

Turn±Off Time

 

 

 

 

 

 

 

(TC = 125°C)

toff

 

Ð

1.5

2.5

μs

 

 

 

 

 

 

 

 

 

 

Ð

2.0

Ð

 

SWITCHING CHARACTERISTICS: Inductive Load (Vclamp = 300 V, VCC = 15 V, L = 200 μH)

 

 

 

 

Fall Time

 

(IC = 2.0 Adc, IB1 = 0.2 Adc

(TC = 125°C)

tfi

 

Ð

100

180

ns

 

 

IB2 = 1.0 Adc)

 

 

 

Ð

120

Ð

 

Storage Time

 

 

 

 

 

 

 

(TC = 125°C)

tsi

 

Ð

1.3

2.5

μs

 

 

 

 

 

 

 

 

 

 

Ð

1.9

Ð

 

Crossover Time

 

 

 

 

 

 

 

(TC = 125°C)

tc

 

Ð

210

350

ns

 

 

 

 

 

 

 

 

 

 

Ð

230

Ð

 

Fall Time

 

(IC = 4.5 Adc, IB1 = 0.9 Adc

(TC = 125°C)

tfi

 

Ð

80

150

ns

 

 

IB2 = 2.25 Adc)

 

 

 

Ð

100

Ð

 

Storage Time

 

 

 

 

 

 

 

(TC = 125°C)

tsi

 

Ð

1.6

3.2

μs

 

 

 

 

 

 

 

 

 

 

Ð

2.1

Ð

 

Crossover Time

 

 

 

 

 

 

 

(TC = 125°C)

tc

 

Ð

170

300

ns

 

 

 

 

 

 

 

 

 

 

Ð

200

Ð

 

Fall Time

 

(IC = 4.5 Adc, IB1 = 0.9 Adc

(TC = 125°C)

tfi

 

60

Ð

180

ns

 

 

IB2 = 0.9 Adc)

 

 

 

Ð

150

Ð

 

Storage Time

 

 

 

 

 

 

 

(TC = 125°C)

tsi

 

2.6

Ð

3.8

μs

 

 

 

 

 

 

 

 

 

 

Ð

4.3

Ð

 

Crossover Time

 

 

 

 

 

 

 

(TC = 125°C)

tc

 

Ð

200

350

ns

 

 

 

 

 

 

 

 

 

 

Ð

330

Ð

 

3±2

Motorola Bipolar Power Transistor Device Data

BUL147 BUL147F

TYPICAL STATIC CHARACTERISTICS

 

100

 

 

 

 

 

 

 

°

 

V

CE

= 1 V

 

 

TJ = 125 C

 

 

 

GAIN

 

TJ = 25°C

 

 

 

 

, DC CURRENT

10

TJ = ± 20°C

 

 

 

 

 

 

 

 

 

 

FE

 

 

 

 

 

 

h

 

 

 

 

 

 

 

1

 

 

1

 

10

 

0.01

 

0.1

 

IC, COLLECTOR CURRENT (AMPS)

Figure 1. DC Current Gain @ 1 Volt

 

100

 

 

 

 

 

TJ = 125°C

 

VCE = 5 V

GAIN

 

TJ = 25°C

 

 

, DC CURRENT

10

TJ = ± 20°C

 

 

 

 

 

 

FE

 

 

 

 

h

 

 

 

 

 

1

 

 

 

 

0.01

0.1

1

10

IC, COLLECTOR CURRENT (AMPS)

Figure 2. DC Current Gain @ 5 Volts

 

2

 

 

 

 

 

TJ = 25°C

 

 

 

 

(VOLTS)

1.5

 

 

 

 

IC = 1 A

3 A

5 A

8 A

10 A

, VOLTAGE

1

 

 

 

 

 

 

 

 

 

CE

0.5

 

 

 

 

V

 

 

 

 

 

0

0.1

 

1

10

 

0.01

 

 

 

IB, BASE CURRENT (AMPS)

 

Figure 3. Collector Saturation Region

 

1.3

 

 

 

 

 

1.2

 

 

 

 

(VOLTS)

1.1

 

 

 

 

1

 

 

 

 

0.9

 

 

 

 

, VOLTAGE

 

 

 

 

0.8

 

 

 

 

0.7

 

°

 

 

 

 

 

 

BE

 

 

TJ = 25 C

 

 

V

0.6

 

 

 

 

 

 

 

 

 

 

0.5

 

°

 

IC/IB = 5

 

TJ = 125 C

 

IC/IB = 10

 

0.4

 

 

 

 

 

 

 

 

 

0.01

0.1

1

10

IC, COLLECTOR CURRENT (AMPS)

Figure 5. Base±Emitter Saturation Region

 

10

 

 

 

 

 

VOLTAGE(VOLTS)

1

 

 

 

 

 

 

I

/I

= 10

 

 

,

0.1

 

C B

 

 

 

CE

 

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

IC/IB = 5

 

TJ = 25°C

 

0.01

 

 

 

 

TJ = 125°C

 

 

 

0.1

1

10

 

0.01

 

 

IC COLLECTOR CURRENT (AMPS)

Figure 4. Collector±Emitter Saturation Voltage

 

10000

 

 

 

Cib

 

TJ = 25°C

 

 

 

f = 1 MHz

 

1000

 

 

(pF)

Cob

 

 

CAPACITANCE

100

 

 

10

 

 

C,

 

 

 

 

 

 

1

10

100

 

1

VCE, COLLECTOR±EMITTER VOLTAGE (VOLTS)

Figure 6. Capacitance

Motorola Bipolar Power Transistor Device Data

3±3

BUL147 BUL147F

TYPICAL SWITCHING CHARACTERISTICS (IB2 = IC/2 for all switching)

600

 

 

 

 

 

 

 

 

 

IB(off) = IC/2

 

 

IC/IB = 5

 

 

 

500

VCC = 300 V

 

 

IC/IB = 10

 

 

 

 

PW = 20 μs

 

 

 

 

 

 

400

 

 

TJ = 125°C

 

 

 

 

t, TIME (ns)

300

 

 

 

 

TJ = 25°C

 

TIMEt,(ns)

 

 

 

 

 

 

 

200

 

 

 

 

 

 

 

 

100

 

 

 

 

 

 

 

 

0

1

 

3

4

5

6

7

8

0

2

4000

 

 

 

 

 

 

 

IB(off) = IC/2

 

3500

 

 

 

 

TJ = 25°C

 

 

 

 

 

 

TJ = 125°C

 

VCC = 300 V

 

 

 

 

 

 

 

 

3000

 

 

 

 

 

 

 

PW = 20 μs

 

I

/I

= 5

 

 

 

 

 

 

 

 

C B

 

 

 

 

 

 

 

2500

 

 

 

 

 

 

 

 

 

2000

 

 

 

 

 

 

 

 

 

1500

 

 

 

 

 

 

 

 

 

1000

IC/IB = 10

 

 

 

 

 

 

500

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

1

 

 

2

3

4

5

6

7

8

IC, COLLECTOR CURRENT (AMPS)

IC, COLLECTOR CURRENT (AMPS)

Figure 7. Resistive Switching, ton

Figure 8. Resistive Switching, toff

 

3500

 

 

 

 

 

IB(off) = IC/2

 

 

4000

 

 

 

 

TJ = 25°C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3500

 

 

 

 

 

 

IB(off) = IC/2

 

 

3000

 

 

 

 

 

VCC = 15 V

 

 

 

 

 

 

TJ = 125

°

 

 

VCC = 15 V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

I /I

= 5

VZ = 300 V

 

 

3000

 

 

 

 

 

 

 

 

V

Z

= 300 V

 

 

2500

 

 

 

C B

 

LC = 200 μH

 

(ns)

 

 

 

 

 

 

 

 

LC = 200 μH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TIMEt, (ns)

2000

 

 

 

 

 

 

 

STORAGETIME

2500

 

 

 

 

IC

= 2 A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1500

 

 

 

 

 

 

 

 

1500

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1000

 

 

 

 

 

 

 

si

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

,

1000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

t

 

 

 

 

 

 

 

 

 

 

 

 

 

 

500

 

°

 

 

 

 

 

 

500

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TJ = 25 C

IC/IB = 10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

°

 

 

 

 

 

 

 

 

IC = 4.5 A

 

 

 

 

 

 

 

 

 

0

 

TJ = 125

C

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

2

3

4

5

6

7

8

 

4

5

6

7

8

9

10

11

12

 

13

14

15

 

1

 

3

 

 

 

 

IC COLLECTOR CURRENT (AMPS)

 

 

 

 

 

 

 

 

hFE, FORCED GAIN

 

 

 

 

 

 

Figure 9. Inductive Storage Time, tsi

Figure 10. Inductive Storage Time, tsi(hFE)

 

300

 

 

 

 

 

 

 

 

250

 

 

 

 

tc

 

 

 

 

 

 

 

 

 

 

 

200

 

 

tfi

 

 

 

 

(ns)

 

 

 

 

 

 

 

t, TIME

150

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100

IB(off) = IC/2

 

 

 

 

 

 

 

 

 

 

 

 

 

50

VCC = 15 V

 

 

 

TJ = 25°C

 

 

VZ

= 300 V

 

 

 

 

 

 

 

 

 

 

 

 

L

= 200 μH

 

 

 

TJ = 125°C

 

 

0

C

 

 

 

 

 

 

 

1

2

3

4

5

6

7

 

 

 

 

 

 

IC, COLLECTOR CURRENT (AMPS)

 

 

 

250

 

 

 

 

 

 

 

 

 

 

 

 

TJ = 25°C

 

IB(off) = IC/2

 

200

 

 

 

TJ = 125°C

 

VCC = 15 V

 

 

 

 

tc

 

VZ = 300 V

 

 

 

 

 

 

L = 200

μH

 

 

 

 

 

 

 

C

 

t, TIME (ns)

150

 

 

 

 

 

 

 

100

 

 

 

 

 

 

 

 

50

 

tfi

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

2

3

4

5

6

7

8

 

1

IC, COLLECTOR CURRENT (AMPS)

Figure 11. Inductive Switching, tc and tfi

Figure 12. Inductive Switching, tc and tfi

IC/IB = 5

IC/IB = 10

3±4

Motorola Bipolar Power Transistor Device Data

BUL147 BUL147F

TYPICAL SWITCHING CHARACTERISTICS (IB2 = IC/2 for all switching)

 

180

 

 

 

TJ = 25°C

 

 

 

IB(off) = IC/2

 

300

 

 

 

 

 

 

 

 

 

 

 

160

 

 

 

TJ = 125°C

 

 

 

VCC = 15 V

 

250

 

 

 

 

 

 

 

 

IC = 2 A

 

VZ = 300 V

(ns)

TIME (ns)

 

 

 

 

 

 

 

 

L

C

= 200

μH

 

140

 

 

 

 

 

 

 

 

 

 

 

TIME

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

200

120

 

 

 

 

 

 

 

 

 

 

 

 

 

FALL

 

 

 

 

 

 

 

 

 

 

 

 

CROSSOVER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

150

,

100

 

 

 

 

 

 

 

 

 

 

 

 

 

fi

 

 

 

 

 

 

 

 

 

 

 

 

 

t

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

100

 

80

 

 

 

 

 

 

 

 

 

 

 

 

T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

IC = 4.5 A

 

 

 

 

 

 

 

 

 

 

 

50

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

3

5

6

7

8

9

10

11

12

 

13

14

15

 

 

 

 

 

 

 

IC = 2 A

 

IB(off) = IC/2

 

 

 

 

 

 

 

 

 

 

VCC = 15 V

 

 

 

 

 

 

 

 

 

 

VZ = 300 V

 

 

 

 

 

 

 

 

 

 

LC = 200 μH

 

 

 

 

IC = 4.5 A

 

 

 

 

 

 

 

 

 

 

 

 

TJ = 25°C

 

 

 

 

 

 

 

 

 

 

 

 

TJ = 125°C

 

 

 

 

 

 

 

 

3

4

5

6

7

8

9

10

11

12

13

14

15

hFE, FORCED GAIN

hFE, FORCED GAIN

Figure 13. Inductive Fall Time

Figure 14. Inductive Crossover Time

GUARANTEED SAFE OPERATING AREA INFORMATION

 

100

 

 

 

 

9

 

DC (BUL147)

 

 

 

 

8

(AMPS)

5 ms

1 ms

10 μs

1 μs

(AMPS)

7

10

 

 

 

CURRENT

 

 

 

 

CURRENT

6

 

 

 

EXTENDED

5

1

 

 

SOA

 

 

 

COLLECTOR

 

 

 

 

COLLECTOR

4

DC (BUL147F)

 

 

 

3

0.1

 

 

 

2

,

 

 

 

 

,

 

C

 

 

 

 

C

1

I

 

 

 

 

I

 

 

 

 

 

 

 

0.01

100

 

1000

 

0

 

10

 

 

 

 

VCE, COLLECTOR±EMITTER VOLTAGE (VOLTS)

 

 

 

 

 

 

 

 

TC ≤ 125°C

 

 

 

 

 

 

 

IC/IB ≥ 4

 

 

 

 

 

 

 

LC = 500 μH

 

 

 

 

 

 

 

 

± 5 V

 

 

 

 

VBE(off) = 0 V

 

±1, 5 V

 

 

0

100

200

300

400

500

600

700

800

VCE, COLLECTOR±EMITTER VOLTAGE (VOLTS)

Figure 15. Forward Bias Safe Operating Area

Figure 16. Reverse Bias Switching Safe Operating Area

 

1.0

 

 

 

 

 

 

 

FACTOR

0.8

 

 

 

SECOND BREAKDOWN

 

 

 

 

 

DERATING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DERATING

0.6

 

 

 

 

 

 

 

0.4

 

 

 

 

 

 

 

POWER

 

 

 

 

 

 

 

0.2

 

 

THERMAL DERATING

 

 

 

 

 

 

 

 

 

 

 

 

0.0

40

60

80

100

120

140

160

 

20

 

 

 

TC, CASE TEMPERATURE (°C)

 

 

Figure 17. Forward Bias Power Derating

There are two limitations on the power handling ability of a transistor: average junction temperature and second breakdown. Safe operating area curves indicate IC ± VCE limits of the transistor that must be observed for reliable operation; i.e., the transistor must not be subjected to greater dissipation than the curves indicate. The data of Figure 15 is based on TC = 25°C; TJ(pk) is variable depending on power level. Second breakdown pulse limits are valid for duty cycles to 10% but must be derated when TC > 25°C. Second breakdown limitations do not derate the same as thermal limitations. Allowable current at the voltages shown in Figure 15 may be found at any case temperature by using the appropriate curve on Fig-

ure 17. TJ(pk) may be calculated from the data in Figure 20 and 21. At any case temperatures, thermal limitations will re-

duce the power that can be handled to values less than the limitations imposed by second breakdown. For inductive loads, high voltage and current must be sustained simultaneously during turn±off with the base±to±emitter junction reverse±biased. The safe level is specified as a reverse±biased safe operating area (Figure 16). This rating is verified under clamped conditions so that the device is never subjected to an avalanche mode.

Motorola Bipolar Power Transistor Device Data

3±5

Источник: https://studfile.net/preview/16503839/