參數(shù)資料
型號: BLW78
廠商: NXP SEMICONDUCTORS
元件分類: 功率晶體管
英文描述: HF/VHF power transistor
中文描述: VHF BAND, Si, NPN, RF POWER TRANSISTOR
封裝: CERAMIC, SOT-121B, 4 PIN
文件頁數(shù): 6/16頁
文件大小: 83K
代理商: BLW78
August 1986
6
Philips Semiconductors
Product specification
HF/VHF power transistor
BLW78
APPLICATION INFORMATION
R.F. performance in c.w. operation (unneutralized common-emitter class-B circuit); T
h
= 25
°
C
List of components:
Note
1.
ATC means American Technical Ceramics.
f (MHz)
V
CE
(V)
28
P
L
(W)
100
P
D
(W)
25
η
(%)
70
z
i
(
)
Z
L
(
)
4,30
+
j0,60
150
0,74
+
j1,35
C1 = C2 = C7 = C8 = 5 to 100 pF film dielectric trimmer
C3 = 203 pF; 2
×
82 pF and 39 pF multilayer ceramic chip capacitors (500 V, ATC
(1)
) in parallel
C4 = 39 pF multilayer ceramic chip capacitor (500 V, ATC
(1)
)
C5 = 1 nF feed-through capacitor
C6 = 100 nF polyester capacitor
L1 = strip (30 mm
×
8 mm); bent to form inverted ‘U’ shape with top 15 mm above heatsink, and bottom 5 mm above
heatsink
L2 = 1
μ
H r.f. choke
L3 = strip; shape as shown in Fig.8; 5 mm above heatsink
L4 = strip (40 mm
×
8 mm); bent in form
, 25 mm at 15 mm above heatsink, 5 mm at 5 mm above heatsink
L5 = strip (75 mm long; width 8 mm); 5 mm above base
L1, L3, L4, and L5 are copper strips with a thickness of 0,6 mm.
Heatsink: aluminium; 0,9 K/W
At P
L
= 100 W and V
CE
= 28 V, the output power at heatsink temperatures between 25
°
C and 90
°
C relative to that at
25
°
C is diminished by typ. 0,12 W/K.
Component layout on an aluminium heatsink for 150 MHz test circuit is shown in Fig.8.
Fig.7 Test circuit; c.w. class-B; f = 150 MHz.
handbook, full pagewidth
MGP548
50
50
C2
L2
C1
C7
C8
L3
L5
+
VCC
L1
T.U.T.
C3
C4
C5
C6
L4
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