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MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Order this document by BUL45/D

Designer's Data Sheet

BUL45*

BUL45F*

 

NPN Silicon Power Transistor

 

*Motorola Preferred Device

 

High Voltage SWITCHMODEt Series

Designed for use in electronic ballast (light ballast) and in Switchmode Power supplies up to 50 Watts. Main features include:

Improved Efficiency Due to:

ÐLow Base Drive Requirements (High and Flat DC Current Gain h FE)

ÐLow Power Losses (On±State and Switching Operations)

ÐFast Switching: t fi = 100 ns (typ) and tsi = 3.2 μs (typ)

ÐFast Switching: @ IC = 2.0 A, IB1 = IB2 = 0.4 A

Full Characterization at 125°C

Tight Parametric Distributions Consistent Lot±to±Lot

BUL45F, Case 221D, is UL Recognized at 3500 VRMS: File #E69369

MAXIMUM RATINGS

Rating

 

Symbol

BUL45

 

BUL45F

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

 

5.0

Adc

Ð Peak(1)

 

ICM

 

10

 

Base Current

 

IB

 

2.0

Adc

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

75

 

35

Watts

Derate above 25°C

 

 

0.6

 

0.28

W/°C

 

 

 

 

 

Operating and Storage Temperature

TJ, Tstg

± 65 to 150

°C

THERMAL CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

Rating

 

Symbol

MJE18006

MJF18006

Unit

 

 

 

 

 

 

Thermal Resistance Ð Junction to Case

RθJC

1.65

 

3.55

°C/W

Ð Junction to Ambient

RθJA

62.5

 

62.5

 

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

POWER TRANSISTOR

5.0 AMPERES

700 VOLTS

35 and 75 WATTS

BUL45

CASE 221A±06

TO±220AB

BUL45F

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

μAdc

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

ICES

Ð

Ð

10

μAdc

(TC = 125°C)

 

Ð

Ð

100

 

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

IEBO

Ð

Ð

100

μAdc

(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 2

Motorola, Inc. 1995

BUL45 BUL45F

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

 

 

Characteristic

 

 

 

 

Symbol

Min

Typ

Max

Unit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Base±Emitter Saturation Voltage (IC = 1.0 Adc, IB = 0.2 Adc)

VBE(sat)

Ð

0.84

1.2

Vdc

 

 

 

 

(IC = 2.0 Adc, IB = 0.4 Adc)

 

Ð

0.89

1.25

 

Collector±Emitter Saturation Voltage

 

 

 

 

VCE(sat)

 

 

 

Vdc

(IC = 1.0 Adc, IB = 0.2 Adc)

 

 

 

 

 

(TC = 125°C)

 

Ð

0.175

0.25

 

 

 

 

 

 

 

 

 

 

 

Ð

0.150

Ð

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Collector±Emitter Saturation Voltage

 

 

 

 

VCE(sat)

 

 

 

Vdc

(IC = 2.0 Adc, IB = 0.4 Adc)

 

 

 

 

 

(TC = 125°C)

 

Ð

0.25

0.4

 

 

 

 

 

 

 

 

 

 

 

Ð

0.275

Ð

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DC Current Gain (IC = 0.3 Adc, VCE = 5.0 Vdc)

 

 

 

(TC = 125°C)

hFE

14

Ð

34

Ð

DC Current Gain (IC = 2.0 Adc, VCE = 1.0 Vdc)

 

 

 

 

Ð

32

Ð

 

 

 

 

(TC = 125°C)

 

7.0

14

Ð

 

DC Current Gain (IC = 10 mAdc, VCE = 5.0 Vdc)

 

 

 

 

5.0

12

Ð

 

 

 

 

 

 

10

22

Ð

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DYNAMIC CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

fT

Ð

12

Ð

MHz

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

 

Cob

Ð

50

75

pF

Input Capacitance (VEB = 8.0 Vdc)

 

 

 

 

Cib

Ð

920

1200

pF

Dynamic Saturation Voltage:

 

 

 

1.0

μs

 

 

 

Ð

1.75

Ð

 

 

 

 

 

(IC = 1.0 Adc

 

 

(TC = 125°C)

 

Ð

4.4

Ð

 

 

 

 

 

 

 

 

 

 

 

Determined 1.0 μs and

 

 

IB1 = 100 mAdc

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ð

0.5

Ð

 

3.0 μs respectively after

 

VCC = 300 V)

 

3.0

μ

 

 

 

 

rising IB1 reaches 90%

 

 

 

s

 

(TC = 125°C)

VCE

Ð

1.0

Ð

 

 

 

 

 

 

 

Vdc

 

 

 

 

 

 

 

 

 

 

of final IB1

 

 

 

 

1.0

μs

 

 

(Dyn sat)

Ð

1.85

Ð

 

(see Figure 18)

 

 

(IC = 2.0 Adc

 

 

(TC = 125°C)

 

Ð

6.0

Ð

 

 

 

 

 

 

 

 

 

 

 

 

 

IB1 = 400 mAdc

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ð

0.5

Ð

 

 

 

 

 

VCC = 300 V)

 

3.0

μ

 

 

 

 

 

 

 

 

 

 

s

 

(TC = 125°C)

 

Ð

1.0

Ð

 

 

 

 

 

 

 

 

 

 

 

 

SWITCHING CHARACTERISTICS: Resistive Load

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn±On Time

 

(IC = 2.0 Adc, IB1 = IB2 = 0.4 Adc

 

ton

Ð

75

110

ns

 

 

Pulse Width = 20 μs,

 

 

 

(TC = 125°C)

 

Ð

120

Ð

 

 

 

Duty Cycle < 20%

 

 

 

 

 

 

 

 

 

Turn±Off Time

 

 

 

 

 

toff

Ð

2.8

3.5

μ

 

V

= 300 V)

 

 

 

 

 

 

 

 

 

 

s

 

 

CC

 

 

 

 

 

(TC = 125°C)

 

Ð

3.5

Ð

 

 

 

 

 

 

 

 

 

 

 

 

SWITCHING CHARACTERISTICS: Inductive Load (VCC = 15 Vdc, LC = 200 μH, Vclamp = 300 Vdc)

 

 

 

Fall Time

 

(IC = 2.0 Adc, IB1 = 0.4 Adc

 

 

(TC = 125°C)

tfi

70

Ð

170

ns

 

 

IB2 = 0.4 Adc)

 

 

 

 

Ð

200

Ð

 

Storage Time

 

 

 

 

 

 

 

 

(TC = 125°C)

tsi

2.6

Ð

3.8

μs

 

 

 

 

 

 

 

 

 

 

Ð

4.2

Ð

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Crossover Time

 

 

 

 

 

 

 

 

(TC = 125°C)

tc

Ð

230

350

ns

 

 

 

 

 

 

 

 

 

 

Ð

400

Ð

 

 

 

 

 

 

 

 

 

 

Fall Time

 

(IC = 1.0 Adc, IB1 = 100 mAdc

(TC = 125°C)

tfi

Ð

110

150

ns

 

 

IB2 = 0.5 Adc)

 

 

 

 

Ð

100

Ð

 

Storage Time

 

 

 

 

 

 

 

 

(TC = 125°C)

tsi

Ð

1.1

1.7

μs

 

 

 

 

 

 

 

 

 

 

Ð

1.5

Ð

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Crossover Time

 

 

 

 

 

 

 

 

(TC = 125°C)

tc

Ð

170

250

ns

 

 

 

 

 

 

 

 

 

 

Ð

170

Ð

 

 

 

 

 

 

 

 

 

 

Fall Time

 

(IC = 2.0 Adc, IB1 = 250 mAdc

(TC = 125°C)

tfi

Ð

80

120

ns

 

 

IB2 = 2.0 Adc)

 

 

 

 

 

 

 

 

Storage Time

 

 

 

 

 

 

 

 

(TC = 125°C)

tsi

Ð

0.6

0.9

μs

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Crossover Time

 

 

 

 

 

 

 

 

(TC = 125°C)

tc

Ð

175

300

ns

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

Motorola Bipolar Power Transistor Device Data

BUL45 BUL45F

TYPICAL STATIC CHARACTERISTICS

 

100

 

 

 

 

100

 

 

 

 

 

TJ = 25°C

 

VCE = 1 V

 

 

 

°

VCE = 5 V

 

 

 

 

 

 

 

TJ = 25 C

 

GAIN

 

TJ = 125°C

 

 

GAIN

TJ = 125°C

 

 

 

 

 

 

 

 

 

 

 

, DC CURRENT

 

TJ = ± 20°C

 

 

, DC CURRENT

TJ = ± 20°C

 

 

 

10

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

FE

 

 

 

 

FE

 

 

 

 

h

 

 

 

 

h

 

 

 

 

 

1

 

 

 

 

1

 

 

 

 

0.01

0.10

1.00

10.00

 

0.01

0.10

1.00

10.00

 

 

IC, COLLECTOR CURRENT (AMPS)

 

 

 

IC, COLLECTOR CURRENT (AMPS)

 

Figure 1. DC Current Gain @ 1 Volt

Figure 2. DC Current Gain at @ 5 Volts

 

2.0

 

 

TJ = 25°C

 

 

 

 

(VOLTS)

1.5

 

 

 

 

 

 

 

VOLTAGE,

1 A

1.5 2 A

3 A 4 A 5 A

6 A

 

1.0

A

 

 

 

 

 

 

CE

 

 

 

 

V

0.5

 

 

 

 

 

 

 

 

IC = 0.5 A

 

 

 

 

0

0.10

1.00

10.00

 

0.01

IB, BASE CURRENT (AMPS)

Figure 3. Collector±Emitter Saturation Region

 

1.1

 

 

 

 

1.0

 

 

 

(VOLTS)

0.9

 

 

 

0.8

 

 

 

, VOLTAGE

 

 

 

0.7

TJ = 25°C

 

 

 

 

 

 

 

 

 

BE

0.6

 

 

 

V

TJ = 125°C

 

 

 

 

 

IC/IB = 10

 

0.5

 

 

 

 

 

 

IC/IB = 5

 

0.4

 

 

 

 

0.01

0.10

1.00

10.00

IC, COLLECTOR CURRENT (AMPS)

Figure 5. Base±Emitter Saturation Region

 

10

 

 

 

 

 

 

,VOLTAGE (VOLTS)

1.0

 

 

 

 

 

 

0.1

IC/IB = 10

 

 

 

CE

 

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

I

/I

= 5

 

 

TJ = 25°C

 

 

 

C B

 

 

 

TJ = 125°C

 

 

 

 

 

 

 

 

0.01

 

 

 

0.10

1.00

10.00

 

0.01

 

 

 

 

 

 

 

 

IC, COLLECTOR CURRENT (AMPS)

 

Figure 4. Collector±Emitter Saturation Voltage

 

10000

 

 

 

 

 

 

 

TJ = 25°C

 

 

Cib

 

f = 1 MHz

 

1000

 

 

(pF)

 

 

 

 

 

 

 

C, CAPACITANCE

100

Cob

 

 

 

 

 

10

 

 

 

 

 

 

 

 

1

10

100

1000

 

1

VCE, COLLECTOR±EMITTER VOLTAGE (VOLTS)

Figure 6. Capacitance

Motorola Bipolar Power Transistor Device Data

3

BUL45 BUL45F

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

1200

IB(off) = IC/2

 

 

 

 

 

3000

 

 

 

°

 

 

 

 

VCC = 300 V

 

 

TJ = 25 C

 

 

1000

 

 

°

 

2500

PW = 20

μs

 

 

TJ = 125

C

 

 

 

 

 

 

 

 

800

 

 

 

 

 

 

 

2000

600

IC/IB = 10

 

 

 

 

 

1500

 

 

 

 

 

 

 

TIMEt,(ns)

 

 

 

 

 

 

 

TIMEt,(ns)

400

 

 

 

 

 

 

 

1000

200

 

 

 

 

 

 

IC/IB = 5

500

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

0

0

1

2

3

4

5

6

7

8

 

 

IC, COLLECTOR CURRENT (AMPS)

 

 

 

 

 

 

 

TJ = 25°C

 

IB(off) = IC/2

 

 

 

IC/IB = 5

 

 

 

VCC = 300 V

 

 

 

 

 

TJ = 125°C

 

 

 

 

 

 

 

 

 

PW = 20 μs

 

 

IC/IB = 10

 

 

 

 

 

 

 

0

1

2

3

4

5

6

7

8

 

 

IC, COLLECTOR CURRENT (AMPS)

 

 

Figure 7. Resistive Switching, ton

Figure 8. Resistive Switching, toff

 

3500

 

 

 

 

 

 

 

 

 

3500

 

 

 

 

 

 

 

 

 

 

IB(off) = IC/2

 

 

3000

 

 

 

V

Z

= 300 V

 

 

 

 

 

 

 

 

 

TJ = 25°C

 

 

 

 

 

V

 

= 15 V

 

 

 

 

 

 

 

 

 

 

°

LC = 200 μH

 

 

 

 

 

 

CC

 

3000

 

 

 

 

 

 

 

TJ = 125

C

VZ = 300 V

 

 

 

 

 

IC/IB = 5

IB(off) = IC/2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2500

 

 

(ns)

 

 

 

 

 

 

 

 

 

 

 

VCC = 15 V

 

 

 

 

 

LC = 200

μH

2500

 

 

 

 

 

 

 

 

 

 

 

(ns)TIMEt,

 

 

 

 

 

 

 

 

 

TIMESTORAGE

 

 

 

 

 

IC

= 1 A

 

 

 

 

 

 

2000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1500

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1000

 

 

 

 

 

 

 

 

si

1500

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

t

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

500

TJ = 25°C

 

 

 

 

 

 

 

 

1000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TJ = 125°C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC/IB = 10

 

 

 

 

 

 

 

 

 

 

 

IC = 2 A

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

500

 

 

 

 

 

 

 

 

 

 

 

 

0

1

2

3

 

4

 

5

 

3

4

5

6

7

8

9

10

11

12

13

14

15

 

 

IC, COLLECTOR CURRENT (AMPS)

 

 

 

 

 

 

 

 

 

 

 

hFE, FORCED GAIN

 

 

 

 

 

Figure 9. Inductive Storage Time, tsi

Figure 10. Inductive Storage Time, tsi(hFE)

 

300

 

 

 

 

 

 

200

 

250

 

 

 

tc

 

 

 

 

 

 

 

 

 

 

150

 

 

 

 

 

 

 

 

 

200

 

 

 

 

 

 

 

(ns)

 

 

 

 

 

 

(ns)

 

t, TIME

150

 

 

 

 

 

t, TIME

100

 

 

 

 

 

 

 

 

100

VCC = 15 V

 

 

 

 

 

 

 

 

 

 

 

50

 

50

IB(off) = IC/2

 

tfi

°

 

 

 

LC = 200

μ

 

 

 

 

 

H

 

 

TJ = 25 C

 

 

 

0

VZ = 300 V

 

 

TJ = 125°C

 

0

 

0

1

2

3

4

5

 

 

 

IC, COLLECTOR CURRENT (AMPS)

 

 

 

tc

 

 

IB(off) = IC/2

 

 

 

 

VCC = 15 V

 

t

 

 

V

= 300 V

 

fi

°

Z

= 200 μH

 

 

TJ = 25 C

L

 

 

TJ = 125

°

C

 

 

 

C

0

1

2

3

4

5

 

IC, COLLECTOR CURRENT (AMPS)

 

 

Figure 11. Inductive Switching, tc & tfi, IC/IB = 5

Figure 12. Inductive Switching, tc & tfi, IC/IB = 10

4

Motorola Bipolar Power Transistor Device Data

BUL45 BUL45F

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

 

150

 

 

 

 

 

 

 

 

 

 

 

 

300

 

140

 

 

 

 

 

 

TJ = 25°C

 

IB(off) = IC/2

 

 

 

 

 

 

 

 

 

TJ = 125°C

 

VCC

= 15 V

 

 

 

 

 

 

 

 

 

 

 

 

250

 

130

 

 

 

 

 

 

 

 

 

VZ = 300 V

(ns)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IC = 1 A

 

LC = 200 μH

 

TIME (ns)

120

 

 

 

 

 

 

 

 

TIME

 

 

 

 

 

 

 

 

 

 

 

 

200

 

 

 

 

 

 

 

 

 

 

 

 

110

 

 

 

 

 

 

 

 

 

 

 

 

, FALL

 

 

 

 

 

 

 

 

 

 

 

CROSSOVER

 

100

 

 

 

 

 

 

 

 

 

 

 

150

fi

 

 

 

 

 

 

 

 

 

 

 

 

 

t

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90

 

 

 

 

 

 

 

 

 

 

 

,

 

 

 

 

 

 

 

 

 

 

 

 

 

c

 

 

 

 

 

 

 

 

 

 

 

 

 

 

t

100

 

 

 

IC = 2 A

 

 

 

 

 

 

 

 

 

 

80

 

 

 

 

 

 

 

 

 

 

 

 

70

4

5

6

7

8

9

10

11

12

13

14

15

50

 

3

 

hFE, FORCED GAIN

 

 

 

 

 

 

 

 

 

 

VCC = 15 V

 

 

 

 

 

 

 

 

 

 

 

VZ = 300 V

 

 

 

 

 

 

 

 

 

 

 

IB(off) = IC/2

 

 

 

 

 

 

 

 

IC = 1 A

 

LC = 200 μH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TJ = 25°C

 

IC = 2 A

 

 

 

 

 

 

 

 

 

TJ = 125

°

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

3

4

5

6

7

8

9

10

11

12

13

14

15

 

 

 

 

 

hFE, FORCED GAIN

 

 

 

 

 

Figure 13. Inductive Fall Time, tfi(hFE)

Figure 14. Crossover Time

GUARANTEED SAFE OPERATING AREA INFORMATION

 

100

 

 

 

 

(AMPS)

DC (BUL45)

 

 

 

 

5 ms

1 ms

50 μs

10 μs

1 μs

10

 

 

 

 

CURRENT

1.0

 

 

 

EXTENDED

, COLLECTOR

 

 

 

 

SOA

DC (BUL45F)

 

 

 

 

0.1

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

I

 

 

 

 

 

 

0.01

 

 

 

 

 

10

100

 

 

1000

 

VCE, COLLECTOR±EMITTER VOLTAGE (VOLTS)

 

6

 

 

 

 

 

(AMPS)

 

 

 

 

TC 125°C

5

 

 

 

IC/IB

4

 

 

 

 

LC = 500 μH

CURRENT

4

 

 

 

 

 

3

 

 

 

 

 

COLLECTOR

 

 

 

 

 

2

 

 

 

 

 

1

 

 

 

±5 V

 

,

 

 

 

 

C

 

 

 

 

 

I

 

VBE(off) = 0 V

±1.5 V

 

 

 

0

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

20

40

60

80

100

120

140

160

 

 

 

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 Figures 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

5

Источник: https://studfile.net/preview/16503803/