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BLF278/01,112

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
2003 Sep 19 13
Philips Semiconductors Product Specification
VHF push-pull power MOS transistor BLF278
Class-AB operation
RF performance in CW operation in a common source push-pull test circuit. T
h
=25°C; R
th mb-h
= 0.15 K/W unless
otherwise specified. R
GS
= 2.8 Ω per section; optimum load impedance per section = 0.74 + j2 Ω; (V
DS
= 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 the
following conditions: V
DS
= 50 V; f = 225 MHz at rated output power.
MODE OF OPERATION
f
(MHz)
V
DS
(V)
I
DQ
(A)
P
L
(W)
G
p
(dB)
η
D
(%)
CW, class-AB 225 50 2 × 0.5 250 >14
typ. 16
>50
typ. 55
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; V
DS
= 50 V; I
DQ
=2×0.5 A; f = 225 MHz;
Z
L
= 0.74 + j2 Ω (per section); R
GS
= 2.8 Ω (per section).
(1) T
h
=25°C.
(2) T
h
=70°C.
handbook, halfpage
0 100 200 300
20
0
10
MGE614
G
p
(dB)
P
L
(W)
(2)
(1)
Fig.19 Efficiency as a function of load power;
typical values.
Class-AB operation; V
DS
= 50 V; I
DQ
=2×0.5 A; f = 225 MHz;
Z
L
= 0.74 + j2 Ω (per section); R
GS
= 2.8 Ω (per section).
(1) T
h
=25°C.
(2) T
h
=70°C.
handbook, halfpage
0
60
40
η
D
(%)
20
0
100 200
P
L
(W)
300
MGE612
(2)
(1)
Fig.20 Load power as a function of input power;
typical values.
Class-AB operation; V
DS
= 50 V; I
DQ
=2×0.5 A; f = 225 MHz;
Z
L
= 0.74 + j2 Ω (per section); R
GS
= 2.8 Ω (per section).
(1) T
h
=25°C.
(2) T
h
=70°C.
handbook, halfpage
0 5 10 15
400
300
100
0
200
MGE613
P
L
(W)
P
i
(W)
(1)
(2)
2003 Sep 19 15
Philips Semiconductors Product Specification
VHF push-pull power MOS transistor BLF278
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Fig.21 Class-AB test circuit at f = 225 MHz.
handbook, full pagewidth
MGE617
L13
C17
C18
C19
R9
R11
IC1
C38
C37
C36
C35
L17
C26
C27
C25
L19 L21
R5
C12
C13
C9
R6
R7
L16
C22
C14
C23
C24
L14R8
R2
R3
R4
L4
L1
C5
C4
C3
R1
C1
C2
C6 C7
C20
C21 C28 C29 C30
C33
C31
L22
L23
L24
L20L18L12
D.U.T.
L15
C32
C34
R10
L6 L8 L10
L5L3
L2
50 Ω
input
50 Ω
output
L7 L9 L11
C8
C15
C10
C11
C16
+V
DD1
A
A
+V
DD1
+V
DD2
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BLF278/01,112

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