BLW85 データシートの表示（PDF） - Philips Electronics
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BLW85 Datasheet PDF : 15 Pages
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Philips Semiconductors
HF/VHF power transistor
Product specification
BLW85
APPLICATION INFORMATION
R.F. performance in c.w. operation (unneutralized common-emitter class-B circuit); Th = 25 °C
f (MHz)
175
175
VCE (V)
12,5
13,5
PL (W)
45
45
PS (W)
< 16
−
Gp (dB)
> 4,5
typ. 6,0
IC (A)
< 4,8
−
η (%)
> 75
typ. 75
zi (Ω)
1,4 + j1,5
−
ZL (Ω)
2,7 − j1,3
−
handbook, full pagewidth
50 Ω
C1
L1
C2
L2
C3a
L4
C3b
L5
T.U.T.
L6
C6a
L7
C7
C6b
50 Ω
C8
C4
R1
L3
C5 R2
L8
+VCC
MGP604
Fig.7 Test circuit; c.w. class-B.
List of components:
C1 = 2,5 to 20 pF film dielectric trimmer (cat. no. 2222 809 07004)
C2 = C8 = 4 to 40 pF film dielectric trimmer (cat. no. 2222 809 07008)
C3a = C3b = 47 pF ceramic capacitor (500 V)
C4 = 120 pF ceramic capacitor (500 V)
C5 = 100 nF polyester capacitor
C6a = C6b = 8,2 pF ceramic capacitor (500 V)
C7 = 5 to 60 pF film dielectric trimmer (cat. no. 2222 809 07011)
L1 = 1 turn Cu wire (1,6 mm); int. dia. 9,0 mm; leads 2 × 5 mm
L2 = 100 nH; 7 turns closely wound enamelled Cu wire (0,5 mm); int. dia. 3 mm; leads 2 × 5 mm
L3 = L8 = Ferroxcube wide-band h.f. choke, grade 3B (cat. no. 4312 020 36640)
L4 = L5 = strip (12 mm × 6 mm); taps for C3a and C3b at 5 mm from transistor
L6 = 2 turns enamelled Cu wire (1,6 mm); int. dia. 5,0 mm; length 6,0 mm; leads 2 × 5 mm
L7 = 2 turns enamelled Cu wire (1,6 mm); int. dia. 4,5 mm; length 6,0 mm; leads 2 × 5 mm
L4 and L5 are strips on a double Cu-clad printed-circuit board with epoxy fibre-glass dielectric, thickness 1/16".
R1 = 10 Ω (±10%) carbon resistor (0,25 W)
R2 = 4,7 Ω (±5%) carbon resistor (0,25 W)
Component layout and printed-circuit board for 175 MHz test circuit are shown in Fig.8.
March 1993
6
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