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BLF278 VHF push-pull power MOS transistor t e e h s a t a d t c u d o r P 5 1 0 2 r e b m e t p e S 1 5 . v e R IMPORTANT NOTICE Dear customer, As of December 7th, 2015 BL RF Power of NXP Semiconductors will operate as an independent company under the new trade name Ampleon, which will be used in future data sheets together with new contact details. In data sheets, where the previous Philips references is mentioned, please use the new links as shown below. http://www.philips.semiconductors.com use http://www.ampleon.com http://www.semiconductors.philips.com use http://www.ampleon.com (Internet) [email protected] use http://www.ampleon.com/sales The copyright notice at the bottom of each page (or elsewhere in the document, depending on the version) - © Koninklijke Philips Electronics N.V. (year). All rights reserved - is replaced with: - © Ampleon B.V. (year). All rights reserved. - If you have any questions related to the data sheet, please contact our nearest sales office (details via http://www.ampleon.com/sales). Thank you for your cooperation and understanding, Ampleon

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Page 1: BLF278 VHF push-pull power MOS transistor · 2003 Sep 19 3 Philips Semiconductors Product Specification VHF push-pull power MOS transistor BLF278 LIMITING VALUES In accordance with

BLF278VHF push-pull power MOS transistor

teehs atad tcudorP5102 rebmetpeS 1 — 5 .veR

IMPORTANT NOTICE

Dear customer,

As of December 7th, 2015 BL RF Power of NXP Semiconductors will operate as an independent company under the new trade name Ampleon, which will be used in future data sheets together with new contact details.

In data sheets, where the previous Philips references is mentioned, please use the new links as shown below.

http://www.philips.semiconductors.com use http://www.ampleon.com

http://www.semiconductors.philips.com use http://www.ampleon.com (Internet)

[email protected] use http://www.ampleon.com/sales

The copyright notice at the bottom of each page (or elsewhere in the document,depending on the version)- © Koninklijke Philips Electronics N.V. (year). All rights reserved -is replaced with:- © Ampleon B.V. (year). All rights reserved. -

If you have any questions related to the data sheet, please contact our nearest sales office (details via http://www.ampleon.com/sales).

Thank you for your cooperation and understanding,

Ampleon

Page 2: BLF278 VHF push-pull power MOS transistor · 2003 Sep 19 3 Philips Semiconductors Product Specification VHF push-pull power MOS transistor BLF278 LIMITING VALUES In accordance with

2003 Sep 19 2

Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

FEATURES

• High power gain

• Easy power control

• Good thermal stability

• Gold metallization ensures excellent reliability.

APPLICATIONS

• Broadcast transmitters in the VHF frequency range.

DESCRIPTION

Dual push-pull silicon N-channel enhancement modevertical D-MOS transistor encapsulated in a 4-lead,SOT262A1 balanced flange package with two ceramiccaps. The mounting flange provides the common sourceconnection for the transistors.

PINNING - SOT262A1

CAUTION

This product is supplied in anti-static packing to preventdamage caused by electrostatic discharge duringtransport and handling. For further information, refer toPhilips specs.: SNW-EQ-608, SNW-FQ-302A, andSNW-FQ-302B.

PIN DESCRIPTION

1 drain 1

2 drain 2

3 gate 1

4 gate 2

5 source

Fig.1 Simplified outline and symbol.

1 2

3 4MAM098Top view

5 5

d

gs

d

g

QUICK REFERENCE DATARF performance at Th = 25 °C in a push-pull common source test circuit.

MODE OF OPERATIONf

(MHz)VDS(V)

PL(W)

Gp(dB)

ηD(%)

CW, class-B 108 50 300 >20 >60

CW, class-C 108 50 300 typ. 18 typ. 80

CW, class-AB 225 50 250 >14typ. 16

>50typ. 55

WARNING

Product and environmental safety - toxic materials

This product contains beryllium oxide. The product is entirely safe provided that the BeO discs are not damaged.All persons who handle, use or dispose of this product should be aware of its nature and of the necessary safetyprecautions. After use, dispose of as chemical or special waste according to the regulations applying at the location ofthe user. It must never be thrown out with the general or domestic waste.

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2003 Sep 19 3

Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

LIMITING VALUESIn accordance with the Absolute Maximum System (IEC 60134).

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

Per transistor section

VDS drain-source voltage − 125 V

VGS gate-source voltage − ±20 V

ID drain current (DC) − 18 A

Ptot total power dissipation Tmb ≤ 25 °C; total device; bothsections equally loaded

− 500 W

Tstg storage temperature −65 150 °CTj junction temperature − 200 °C

SYMBOL PARAMETER CONDITIONS VALUE UNIT

Rth j-mb thermal resistance from junctionto mounting base

total device; both sectionsequally loaded.

max. 0.35 K/W

Rth mb-h thermal resistance frommounting base to heatsink

total device; both sectionsequally loaded.

max. 0.15 K/W

Fig.2 DC SOAR.

Total device; both sections equally loaded.

(1) Current is this area may be limited by RDSon.

(2) Tmb = 25 °C.

handbook, halfpage

1

10

100

1 10 100

(1)

500

ID(A)

V (V)DS

MRA988

(2)

Fig.3 Power derating curves.

Total device; both sections equally loaded.

(1) Continuous operation.

(2) Short-time operation during mismatch.

handbook, halfpage

0 40 80 160

500

0

400

MGE616

120

300

200

100

Ptot(W)

Th (°C)

(2)

(1)

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2003 Sep 19 4

Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

CHARACTERISTICSTj = 25 °C unless otherwise specified.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Per transistor section

V(BR)DSS drain-source breakdown voltage VGS = 0; ID = 100 mA 125 − − V

IDSS drain-source leakage current VGS = 0; VDS = 50 V − − 2.5 mA

IGSS gate-source leakage current VGS = ±20 V; VDS = 0 − − 1 µA

VGSth gate-source threshold voltage VDS = 10 V; ID = 50 mA 2 − 4.5 V

∆VGS gate-source voltage differenceof both sections

VDS = 10 V; ID = 50 mA − − 100 mV

gfs forward transconductance VDS = 10 V; ID = 5 A 4.5 6.2 − S

gfs1/gfs2 forward transconductance ratioof both sections

VDS = 10 V; ID = 5 A 0.9 − 1.1

RDSon drain-source on-state resistance VGS = 10 V; ID = 5 A − 0.2 0.3 ΩIDSX drain cut-off current VGS = 10 V; VDS = 10 V − 25 − A

Cis input capacitance VGS = 0; VDS = 50 V; f = 1 MHz − 480 − pF

Cos output capacitance VGS = 0; VDS = 50 V; f = 1 MHz − 190 − pF

Crs feedback capacitance VGS = 0; VDS = 50 V; f = 1 MHz − 14 − pF

Cd-f drain-flange capacitance − 5.4 − pF

VGS group indicator

GROUP

LIMITS(V) GROUP

LIMITS(V)

MIN. MAX. MIN. MAX.

A 2.0 2.1 O 3.3 3.4

B 2.1 2.2 P 3.4 3.5

C 2.2 2.3 Q 3.5 3.6

D 2.3 2.4 R 3.6 3.7

E 2.4 2.5 S 3.7 3.8

F 2.5 2.6 T 3.8 3.9

G 2.6 2.7 U 3.9 4.0

H 2.7 2.8 V 4.0 4.1

J 2.8 2.9 W 4.1 4.2

K 2.9 3.0 X 4.2 4.3

L 3.0 3.1 Y 4.3 4.4

M 3.1 3.2 Z 4.4 4.5

N 3.2 3.3

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2003 Sep 19 5

Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

Fig.4 Temperature coefficient of gate-sourcevoltage as a function of drain current; typicalvalues per section.

VDS = 10 V.

handbook, halfpage0

−510−2 10−1

MGE623

1 10

−4

−3

−2

−1

T.C.(mV/K)

ID (A)

Fig.5 Drain current as a function of gate-sourcevoltage; typical values per section.

VDS = 10 V; Tj = 25 °C.

handbook, halfpage

0

30

20

10

05

ID(A)

10VGS (V)

15

MGE622

Fig.6 Drain-source on-state resistance as afunction of junction temperature; typicalvalues per section.

VGS = 10 V; ID = 5 A.

handbook, halfpage

0 50 100 150

400

0

200

100

300

MGE621

RDSon(mΩ)

Tj (°C)

Fig.7 Input and output capacitance as functionsof drain-source voltage; typical values persection.

VGS = 0; f = 1 MHz.

handbook, halfpage

0

1200

800

400

020

C(pF)

40VDS (V)

60

MGE615

Cos

Cis

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2003 Sep 19 6

Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

Fig.8 Feedback capacitance as a function ofdrain-source voltage; typical values persection.

VGS = 0; f = 1 MHz.

handbook, halfpage

0 10 50

400

300

100

0

200

MGE620

20 30 40

Crs(pF)

VDS (V)

APPLICATION INFORMATION

Class-B operationRF performance in CW operation in a common source push-pull test circuit. Th = 25 °C; Rth mb-h = 0.15 K/W unlessotherwise specified. RGS = 4 Ω per section; optimum load impedance per section = 3.2 + j4.3 Ω (VDS = 50 V).

Ruggedness in class-B operation

The BLF278 is capable of withstanding a load mismatch corresponding to VSWR = 7:1 through all phases under thefollowing conditions: VDS = 50 V; f = 108 MHz at rated load power.

MODE OF OPERATIONf

(MHz)VDS(V)

IDQ(A)

PL(W)

Gp(dB)

ηD(%)

CW, class-B 108 50 2 × 0.1 300 >20typ. 22

>60typ. 70

CW, class-C 108 50 VGS = 0 300 typ. 18 typ. 80

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2003 Sep 19 7

Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

Fig.9 Power gain as a function of load power;typical values.

Class-B operation; VDS = 50 V; IDQ = 2 × 0.1 A; f = 108 MHz;ZL = 3.2 + j4.3 Ω (per section); RGS = 4 Ω (per section).

(1) Th = 25 °C.

(2) Th = 70 °C.

handbook, halfpage

0

30

20

10

0200 400 600

MGE682

PL (W)

Gp(dB) (1)

(2)

Fig.10 Efficiency as a function of load power;typical values.

Class-B operation; VDS = 50 V; IDQ = 2 × 0.1 A; f = 108 MHz;ZL = 3.2 + j4.3 Ω (per section); RGS = 4 Ω (per section).

(1) Th = 25 °C.

(2) Th = 70 °C.

handbook, halfpage

0 200 400PL (W)

600

80

60

ηD(%)

20

0

40

MGE683

(1)

(1)

(2)

(2)

Fig.11 Load power as a function of input power;typical values.

Class-B operation; VDS = 50 V; IDQ = 2 × 0.1 A; f = 108 MHz;ZL = 3.2 + j4.3 Ω (per section); RGS = 4 Ω (per section).

(1) Th = 25 °C.

(2) Th = 70 °C.

handbook, halfpage

0

600

400

200

05 10 15

MGE684

Pi (W)

PL(W)

(1)

(2)

Page 8: BLF278 VHF push-pull power MOS transistor · 2003 Sep 19 3 Philips Semiconductors Product Specification VHF push-pull power MOS transistor BLF278 LIMITING VALUES In accordance with

2003S

ep19

8

Philips S

emiconductors

Product S

pecification

VH

F push-pull pow

er MO

S transistor

BLF

278

This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in_white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here inwhite to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ...

Fig.12 Class-B test circuit at f = 108 MHz.

handbook, full pagewidth

MGE688

R11IC1

C36 C37 C11

C35

L14 L18 L20

R5

C14

C15

C10

R6

R7

R2

R3

R4

L1

T1

C5

C4

C3

R1C1

C2C6 C7 C27 C28C26 C29 C30

C33

C31 L21

L22

L23

L19L17L13D.U.T.

C32

C34

R10

L3 L5 L7

L2

50 Ωinput

50 Ωoutput

L4 L6 L8

C9

C8 C12

C13

C20

C16

C21

C22

L11R8

L9

L12

C17

+VDD1

A

A

+VDD1

L10

C18

C19

R9 L16

C24

C25

C23

L15

+VDD2

Page 9: BLF278 VHF push-pull power MOS transistor · 2003 Sep 19 3 Philips Semiconductors Product Specification VHF push-pull power MOS transistor BLF278 LIMITING VALUES In accordance with

2003 Sep 19 9

Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

List of components (see Figs 12 and 13).

COMPONENT DESCRIPTION VALUE DIMENSIONS CATALOGUE NO.

C1, C2, C33, C34 multilayer ceramic chip capacitor;note 1

22 pF, 500 V

C3, C4 multilayer ceramic chip capacitor;note 1

100 pF + 68 pFin parallel, 500 V

C5, C6, C28 film dielectric trimmer 5 to 60 pF 2222 809 08003

C7 multilayer ceramic chip capacitor;note 1

2 × 100 pF +1 × 120 pF inparallel, 500 V

C8, C11, C12,C15, C16, C19,C36

multilayer ceramic chip capacitor 100 nF, 500 V 2222 852 47104

C9, C10, C13,C14, C20, C25

multilayer ceramic chip capacitor;note 1

1 nF, 500 V

C17, C18, C22,C23

multilayer ceramic chip capacitor;note 1

470 pF, 500 V

C21, C24, C35 electrolytic capacitor 10 µF, 63 V

C26 multilayer ceramic chip capacitor;note 1

2 × 15 pF +1 × 18 pF inparallel, 500 V

C27 multilayer ceramic chip capacitor;note 1

3 × 15 pF inparallel, 500 V

C29 multilayer ceramic chip capacitor;note 1

2 × 18 pF +1 × 15 pF inparallel, 500 V

C30 film dielectric trimmer 2 to 18 pF 2222 809 09006

C31, C32 multilayer ceramic chip capacitor;note 1

3 × 43 pF inparallel, 500 V

L1, L2 stripline; note 2 43 Ω length 57.5 mmwidth 6 mm

L3, L4 stripline; note 2 43 Ω length 29.5 mmwidth 6 mm

L5, L6 stripline; note 2 43 Ω length 14 mmwidth 6 mm

L7, L8 stripline; note 2 43 Ω length 6 mmwidth 6 mm

L9, L10 stripline; note 2 43 Ω length 17.5 mmwidth 6 mm

L11, L16 2 × grade 3B Ferroxcube widebandHF chokes in parallel

4312 020 36642

L12, L15 4 turns enamelled 2 mm copper wire 85 nH length 13.5 mmint. dia. 10 mmleads 2 × 7 mm

L13, L14 stripline; note 2 43 Ω length 19.5 mmwidth 6 mm

Page 10: BLF278 VHF push-pull power MOS transistor · 2003 Sep 19 3 Philips Semiconductors Product Specification VHF push-pull power MOS transistor BLF278 LIMITING VALUES In accordance with

2003 Sep 19 10

Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

Notes

1. American Technical Ceramics capacitor, type 100B or capacitor of same quality.

2. L1 to L10, L13, L14, L17 to L21 and L23 are striplines on a double copper-clad printed-circuit board, with fibre-glassPTFE dielectric (εr = 2.2), thickness 1⁄16 inch; thickness of copper sheet 2 × 35 µm.

3. L22 is soldered on to stripline L21.

L17, L18 stripline; note 2 43 Ω length 24.5 mmwidth 6 mm

L19, L20 stripline; note 2 43 Ω length 66 mmwidth 6 mm

L21, L23 stripline; note 2 50 Ω length 160 mmwidth 4.8 mm

L22 semi-rigid cable; note 3 50 Ω ext. dia. 3.6 mmouter conductorlength 160 mm

R1 metal film resistor 10 Ω, 0.4 W

R2, R7 10 turn potentiometer 50 kΩR3, R6 metal film resistor 3 × 12.1 Ω in

parallel, 0.4 W

R4, R5 metal film resistor 10 Ω; 0.4 W

R8, R9 metal film resistor 10 Ω ±5%, 1 W

R10 metal film resistor 4 × 10 Ω inparallel, 1 W

R11 metal film resistor 5.11 kΩ, 1 W

IC1 voltage regulator 78L05

T1 1:1 Balun; 7 turns type 4C6 50 Ωcoaxial cable wound around toroid

14 × 9 × 5 mm 4322 020 90770

COMPONENT DESCRIPTION VALUE DIMENSIONS CATALOGUE NO.

Page 11: BLF278 VHF push-pull power MOS transistor · 2003 Sep 19 3 Philips Semiconductors Product Specification VHF push-pull power MOS transistor BLF278 LIMITING VALUES In accordance with

2003 Sep 19 11

Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

Fig.13 Printed-circuit board and component layout for 108 MHz class-B test circuit.

The circuit and components are situated on one side of the PTFE fibre-glass board, the other side being fully metallized to serve as an earth.Earth connections are made by means of copper straps for a direct contact between upper and lower sheets.

Dimensions in mm.

handbook, full pagewidth 130 150

100

strap

strap

strap

strapstrap

strapstrap

strap

MBC438

R1C3

C2

C1

C4

L1

L2C6

R11C36

L3

L4

IC1VDD1

R2 and R7C8

C11

C7 L5

L6

L7

L8

C9C13

R3C12

slider R2

R4

slider R7C15

R6R5

C10C14

C23 C24

C25

C19

C18

VDD2

L11R8L11

C22 C21

C20

C16

C17

VDD1

L9

L10

L13

L14

L17

L18C26 C27

C28

L19

L20C29

C30

C31

C32

C33

C34

R10

50 Ωinput

50 Ωoutput

L23

L21

L22

L12

L15

C35

C5

T1

L16R9L16

Page 12: BLF278 VHF push-pull power MOS transistor · 2003 Sep 19 3 Philips Semiconductors Product Specification VHF push-pull power MOS transistor BLF278 LIMITING VALUES In accordance with

2003 Sep 19 12

Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

Fig.14 Input impedance as a function of frequency(series components); typical values persection.

Class-B operation; VDS = 50 V; IDQ = 2 × 0.1 A;RGS = 4 Ω (per section); PL = 300 W.

handbook, halfpage

25 75 125f (MHz)

175

2

1

Zi(Ω) ri

xi

−1

−2

0

MGE685

Fig.15 Load impedance as a function of frequency(series components); typical values persection.

Class-B operation; VDS = 50 V; IDQ = 2 × 0.1 A;RGS = 4 Ω (per section); PL = 300 W.

handbook, halfpage

25 75 125f (MHz)

175

8

6

ZL(Ω)

XL

RL

2

0

4

MGE686

Fig.16 Definition of MOS impedance.

handbook, halfpage

MBA379Zi ZL

Fig.17 Power gain as a function of frequency;typical values per section.

Class-B operation; VDS = 50 V; IDQ = 2 × 0.1 A;RGS = 4 Ω (per section); PL = 300 W.

handbook, halfpage

25

30

20

10

075 125 175

MGE687

f (MHz)

Gp(dB)

Page 13: BLF278 VHF push-pull power MOS transistor · 2003 Sep 19 3 Philips Semiconductors Product Specification VHF push-pull power MOS transistor BLF278 LIMITING VALUES In accordance with

2003 Sep 19 13

Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

Class-AB operationRF performance in CW operation in a common source push-pull test circuit. Th = 25 °C; Rth mb-h = 0.15 K/W unlessotherwise specified. RGS = 2.8 Ω per section; optimum load impedance per section = 0.74 + j2 Ω; (VDS = 50 V).

Ruggedness in class-AB operation

The BLF278 is capable of withstanding a load mismatch corresponding to VSWR = 7:1 through all phases under thefollowing conditions: VDS = 50 V; f = 225 MHz at rated output power.

MODE OF OPERATIONf

(MHz)VDS(V)

IDQ(A)

PL(W)

Gp(dB)

ηD(%)

CW, class-AB 225 50 2 × 0.5 250 >14typ. 16

>50typ. 55

Page 14: BLF278 VHF push-pull power MOS transistor · 2003 Sep 19 3 Philips Semiconductors Product Specification VHF push-pull power MOS transistor BLF278 LIMITING VALUES In accordance with

2003 Sep 19 14

Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

Fig.18 Power gain as a function of load power;typical values.

Class-AB operation; VDS = 50 V; IDQ = 2 × 0.5 A; f = 225 MHz;ZL = 0.74 + j2 Ω (per section); RGS = 2.8 Ω (per section).

(1) Th = 25 °C.

(2) Th = 70 °C.

handbook, halfpage

0 100 200 300

20

0

10

MGE614

Gp(dB)

PL (W)

(2)

(1)

Fig.19 Efficiency as a function of load power;typical values.

Class-AB operation; VDS = 50 V; IDQ = 2 × 0.5 A; f = 225 MHz;ZL = 0.74 + j2 Ω (per section); RGS = 2.8 Ω (per section).

(1) Th = 25 °C.

(2) Th = 70 °C.

handbook, halfpage

0

60

40

ηD(%)

20

0100 200

PL (W)300

MGE612

(2)(1)

Fig.20 Load power as a function of input power;typical values.

Class-AB operation; VDS = 50 V; IDQ = 2 × 0.5 A; f = 225 MHz;ZL = 0.74 + j2 Ω (per section); RGS = 2.8 Ω (per section).

(1) Th = 25 °C.

(2) Th = 70 °C.

handbook, halfpage

0 5 10 15

400

300

100

0

200

MGE613

PL(W)

Pi (W)

(1)

(2)

Page 15: BLF278 VHF push-pull power MOS transistor · 2003 Sep 19 3 Philips Semiconductors Product Specification VHF push-pull power MOS transistor BLF278 LIMITING VALUES In accordance with

2003S

ep19

15

Philips S

emiconductors

Product S

pecification

VH

F push-pull pow

er MO

S transistor

BLF

278

This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in_white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here inwhite to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ...

Fig.21 Class-AB test circuit at f = 225 MHz.

handbook, full pagewidth

MGE617

L13

C17

C18

C19

R9R11IC1

C38 C37 C36

C35L17

C26

C27

C25

L19 L21

R5

C12

C13

C9

R6

R7

L16

C22

C14

C23

C24

L14R8

R2

R3

R4

L4L1

C5

C4

C3

R1C1

C2C6 C7 C20 C21 C28 C29 C30

C33

C31 L22

L23

L24

L20L18L12D.U.T.

L15

C32

C34

R10

L6 L8 L10

L5L3

L250 Ωinput

50 Ωoutput

L7 L9 L11

C8

C15

C10

C11

C16

+VDD1

A

A

+VDD1

+VDD2

Page 16: BLF278 VHF push-pull power MOS transistor · 2003 Sep 19 3 Philips Semiconductors Product Specification VHF push-pull power MOS transistor BLF278 LIMITING VALUES In accordance with

2003 Sep 19 16

Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

List of components (see Figs 21 and 22).

COMPONENT DESCRIPTION VALUE DIMENSIONS CATALOGUE NO.

C1, C2 multilayer ceramic chip capacitor;note 1

27 pF, 500 V

C3, C4, C31, C32 multilayer ceramic chip capacitor;note 1

3 × 18 pFin parallel, 500 V

C5 film dielectric trimmer 4 to 40 pF 2222 809 08002

C6, C30 film dielectric trimmer 2 to 18 pF 2222 809 09006

C7 multilayer ceramic chip capacitor;note 1

100 pF, 500 V

C8, C9, C15, C18 MKT film capacitor 1 µF, 63 V 2222 371 11105

C10, C13, C14,C19, C36

multilayer ceramic chip capacitor 100 nF, 50 V 2222 852 47104

C11, C12 multilayer ceramic chip capacitor;note 1

2 × 1 nF in parallel,500 V

C16, C17 electrolytic capacitor 220 µF, 63 V

C20 multilayer ceramic chip capacitor;note 1

3 × 33 pF inparallel, 500 V

C21 film dielectric trimmer 2 to 9 pF 2222 809 09005

C22, C27, C37,C38

multilayer ceramic chip capacitor;note 1

1 nF, 500 V

C23, C26, C35 electrolytic capacitor 10 µF, 63 V

C24, C25 multilayer ceramic chip capacitor;note 1

2 × 470 pF inparallel, 500 V

C28 multilayer ceramic chip capacitor;note 1

2 × 10 pF +1 × 18 pF inparallel, 500 V

C29 multilayer ceramic chip capacitor;note 1

2 × 5.6 pF inparallel, 500 V

C33, C34 multilayer ceramic chip capacitor;note 1

5.6 pF, 500 V

L1, L3, L22, L24 stripline; note 2 50 Ω length 80 mmwidth 4.8 mm

L2, L23 semi-rigid cable; note 3 50 Ω ext. dia. 3.6 mmouter conductorlength 80 mm

L4, L5 stripline; note 2 43 Ω length 24 mmwidth 6 mm

L6, L7 stripline; note 2 43 Ω length 14.5 mmwidth 6 mm

L8, L9 stripline; note 2 43 Ω length 4.4 mmwidth 6 mm

L10, L11 stripline; note 2 43 Ω length 3.2 mmwidth 6 mm

L12, L13 stripline; note 2 43 Ω length 15 mmwidth 6 mm

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Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

Notes

1. American Technical Ceramics capacitor, type 100B or other capacitor of the same quality.

2. L1, L3 to L13, L18 to L22 and L24 are microstriplines on a double copper-clad printed-circuit board, with fibre-glassreinforced PTFE dielectric (εr = 2.2), thickness 1⁄16 inch; thickness of copper sheet 2 × 35 µm.

3. L2 and L23 are soldered on to striplines L1 and L24 respectively.

L14, L17 2 × grade 3B Ferroxcubewideband HF chokes in parallel

4312 020 36642

L15, L16 13⁄4 turns enamelled 2 mm copperwire

40 nH int. dia. 10 mmleads 2 × 7 mmspace 1 mm

L18, L19 stripline; note 2 43 Ω length 13 mmwidth 6 mm

L20, L21 stripline; note 2 43 Ω length 29.5 mmwidth 6 mm

R1 metal film resistor 10 Ω, 0.4 W

R2, R7 10 turns potentiometer 50 kΩR3, R6 metal film resistor 1 kΩ, 0.4 W

R4, R5 metal film resistor 2 × 5.62 Ω, inparallel, 0.4 W

R8, R9 metal film resistor 10 Ω ±5%, 1 W

R10 metal film resistor 4 × 42.2 Ω inparallel, 1 W

R11 metal film resistor 5.11 kΩ, 1 W

IC1 voltage regulator 78L05

COMPONENT DESCRIPTION VALUE DIMENSIONS CATALOGUE NO.

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Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

Fig.22 Printed-circuit board and component layout for 225 MHz class-AB test circuit.

The circuit and components are situated on one side of the PTFE fibre-glass board, the other side being fully metallized to serve as an earth.Earth connections are made by means of copper straps for a direct contact between upper and lower sheets.

Dimensions in mm.

handbook, full pagewidth

MBC436

119 130

100Hollowrivets

Hollowrivets

strap

strap

strap

strapstrap

strap

strap

strap

R11

C38C35 C37

C36C16

IC1

L2

L1

R1

C1

C2

C3

C4

C5L4

L5

C6

slider R2

slider R7

C13 R6

C12

C17

L10

L11

R4

R5

L8L6

L7 L9

VDD1

C10 R3

C11 C8

to R2,R7

VDD1

VDD2C9

C7

L17R9L17

C18

C25 C27

C26C19

L12C20L13

C21C28L18

L19

L20

L21C29

C31

C32

C30 C33

C34

R10

50 Ωoutput

50 Ωinput

L23 L24L3

L22

C14

C22

C23L14R8L14

C15

C24

L15

L16

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Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

Fig.23 Input impedance as a function of frequency(series components); typical values persection.

Class-AB operation; VDS = 50 V; IDQ = 2 × 0.5 A;RGS = 2.8 Ω (per section); PL = 250 W.

handbook, halfpage

150 200 250

2

1

−1

–2

0

MGE611

ri

zi(Ω)

xi

f (MHz)

Fig.24 Load impedance as a function of frequency(series components); typical values persection.

Class-AB operation; VDS = 50 V; IDQ = 2 × 0.5 A;RGS = 2.8 Ω (per section); PL = 250 W.

handbook, halfpage

150 250200f (MHz)

3

2

1

0

MGE625

XL

RL

ZL(Ω)

Fig.25 Definition of MOS impedance.

handbook, halfpage

MBA379Zi ZL

Fig.26 Power gain as a function of frequency;typical values per section.

Class-AB operation; VDS = 50 V; IDQ = 2 × 0.5 A;RGS = 2.8 Ω (per section); PL = 250 W.

handbook, halfpage

150 200 250

20

0

10

MGE624

Gp(dB)

f (MHz)

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Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

BLF278 scattering parametersVDS = 50 V; ID = 500 mA; note 1

Note

1. For more extensive s-parameters see internet:http://www.semiconductors.philips.com/markets/communications/wirelesscommunications/broadcast.

f (MHz)s11 s21 s12 s22

|s11| ∠ Φ |s21| ∠ Φ |s12| ∠ Φ |s22| ∠ Φ

5 0.87 −142.1 60.05 104.3 0.00 −19.4 0.83 160.9

10 0.88 −159.8 32.09 91.4 0.00 0.68 167.5 165.8

20 0.88 −169.0 15.70 77.3 0.01 13.4 0.62 177.6

30 0.88 −171.2 9.98 68.4 0.01 3.4 0.64 −175.8

40 0.89 −172.2 6.99 61.0 0.01 −4.4 0.66 −171.2

50 0.91 −172.9 5.24 55.0 0.01 −10.3 0.70 −168.1

60 0.92 −173.5 4.08 49.6 0.01 −15.0 0.74 −166.8

70 0.93 −174.1 3.26 44.9 0.01 −18.3 0.78 −166.5

80 0.94 −174.7 2.66 41.0 0.01 −19.8 0.80 −166.5

90 0.95 −175.2 2.22 37.5 0.00 −19.7 0.83 −166.7

100 0.95 −175.7 1.88 34.0 0.00 −18.0 0.85 −167.4

125 0.97 −176.9 1.27 26.8 0.00 −1.9 0.88 −169.4

150 0.97 −177.9 0.91 22.7 0.00 35.3 0.91 −170.0

175 0.98 −178.7 0.69 19.5 0.00 65.3 0.94 −170.8

200 0.98 −179.5 0.54 16.0 0.00 78.0 0.95 −172.4

250 0.99 179.2 0.35 12.1 0.01 86.7 0.96 −174.0

300 0.99 178.1 0.25 9.1 0.01 87.8 0.98 −175.5

350 0.99 177.1 0.19 8.2 0.01 90.3 0.98 −176.5

400 0.99 176.1 0.14 7.2 0.01 91.4 0.99 −177.6

450 0.99 175.1 0.11 8.1 0.02 92.2 0.99 −178.3

500 0.99 174.2 0.09 9.7 0.02 91.5 0.99 −179.2

600 0.99 172.4 0.07 14.8 0.02 91.4 0.99 179.5

700 0.99 170.7 0.05 24.0 0.03 91.6 0.99 178.3

800 0.99 168.9 0.04 35.6 0.03 92.5 1.00 177.1

900 0.99 167.1 0.04 46.0 0.04 93.1 1.00 176.0

1000 0.99 165.2 0.04 60.3 0.04 94.1 1.00 175.0

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Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

PACKAGE OUTLINE

REFERENCESOUTLINEVERSION

EUROPEANPROJECTION ISSUE DATE

99-03-29

IEC JEDEC EIAJ

SOT262A1

0 5 10 mm

scale

Flanged double-ended ceramic package; 2 mounting holes; 4 leads SOT262A1

p

A

F

b

e

D

q

U1

D1

H1

U2H

Q

c

5

1 2

43

EE1

C

A w1 A BM M M

B

Mw3

M Mw2 C

UNIT A

mm

Db

5.855.58

0.160.10

22.1721.46

11.0510.2910.03

21.0819.56

9.919.65

5.775.00

c e U2

0.250.25 0.51

w3

27.94

q w2w1F

1.781.52

U1

34.1733.90

H1

17.0216.51

p

3.283.02

Q

2.852.59

E E1D1

10.2710.05

inches0.2300.220

0.0060.004

0.8730.845

21.9821.71

0.8650.855

0.4350.4050.396

0.8300.770

0.3900.380

0.2270.197

0.0100.010 0.0201.1000.0700.060

1.3451.335

0.6700.650

0.1290.119

0.1120.102

0.4040.396

H

DIMENSIONS (millimetre dimensions are derived from the original inch dimensions)

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Philips Semiconductors Product Specification

VHF push-pull power MOS transistor BLF278

DATA SHEET STATUS

Notes

1. Please consult the most recently issued data sheet before initiating or completing a design.

2. The product status of the device(s) described in this data sheet may have changed since this data sheet waspublished. The latest information is available on the Internet at URL http://www.semiconductors.philips.com.

3. For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.

LEVELDATA SHEET

STATUS(1)PRODUCT

STATUS(2)(3) DEFINITION

I Objective data Development This data sheet contains data from the objective specification for productdevelopment. Philips Semiconductors reserves the right to change thespecification in any manner without notice.

II Preliminary data Qualification This data sheet contains data from the preliminary specification.Supplementary data will be published at a later date. PhilipsSemiconductors reserves the right to change the specification withoutnotice, in order to improve the design and supply the best possibleproduct.

III Product data Production This data sheet contains data from the product specification. PhilipsSemiconductors reserves the right to make changes at any time in orderto improve the design, manufacturing and supply. Relevant changes willbe communicated via a Customer Product/Process Change Notification(CPCN).

DEFINITIONS

Short-form specification The data in a short-formspecification is extracted from a full data sheet with thesame type number and title. For detailed information seethe relevant data sheet or data handbook.

Limiting values definition Limiting values given are inaccordance with the Absolute Maximum Rating System(IEC 60134). Stress above one or more of the limitingvalues may cause permanent damage to the device.These are stress ratings only and operation of the deviceat these or at any other conditions above those given in theCharacteristics sections of the specification is not implied.Exposure to limiting values for extended periods mayaffect device reliability.

Application information Applications that aredescribed herein for any of these products are forillustrative purposes only. Philips Semiconductors makeno representation or warranty that such applications will besuitable for the specified use without further testing ormodification.

DISCLAIMERS

Life support applications These products are notdesigned for use in life support appliances, devices, orsystems where malfunction of these products canreasonably be expected to result in personal injury. PhilipsSemiconductors customers using or selling these productsfor use in such applications do so at their own risk andagree to fully indemnify Philips Semiconductors for anydamages resulting from such application.

Right to make changes Philips Semiconductorsreserves the right to make changes in the products -including circuits, standard cells, and/or software -described or contained herein in order to improve designand/or performance. When the product is in full production(status ‘Production’), relevant changes will becommunicated via a Customer Product/Process ChangeNotification (CPCN). Philips Semiconductors assumes noresponsibility or liability for the use of any of theseproducts, conveys no licence or title under any patent,copyright, or mask work right to these products, andmakes no representations or warranties that theseproducts are free from patent, copyright, or mask workright infringement, unless otherwise specified.

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© Koninklijke Philips Electronics N.V. 2003 SCA75All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.

The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changedwithout notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any licenseunder patent- or other industrial or intellectual property rights.

Philips Semiconductors – a worldwide company

Contact information

For additional information please visit http://www.semiconductors.philips.com . Fax: +31 40 27 24825For sales offices addresses send e-mail to: [email protected] .

Printed in The Netherlands 613524/04/pp23 Date of release: 2003 Sep 19 Document order number: 9397 750 11599