BLF178P#3

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© Ampleon The Netherlands B.V. 2015. All rights reserved.

Product data sheet

Rev. 3 — 1 September 2015

8 of 13

BLF178P

Power LDMOS transistor

7.3 Test circuit

[1]

American Technical Ceramics type 800B or capacitor of same quality.

Printed-Circuit Board (PCB): RF 35;

See Table 9 for a list of components.

Fig 10. Component layout for class-AB production test circuit

aaa-002248

T1

T2

BLF178P OUTPUT REV1

BLF178P INTPUT REV1

23 mm

C16

C14

L5

C12

C18

C4

C3

C15

R4

R3

C7

+Vgs

+Vgs

C5

C6

C8

R1

R2

C11

C13

+Vds

C10

+Vds

C19

C20

C21

C22

L7

L8

C17

L3

L4

L1

C1

C2

L2

L6

Table 9.

List of components

For test circuit see Figure 10.

Component

Description

Value

Remarks

C1, C2, C5, C6, C14,

C15, C21, C22

multilayer ceramic chip capacitor

1 nF

[1]

C3

multilayer ceramic chip capacitor

82 pF

[1]

C4

multilayer ceramic chip capacitor

240 pF

[1]

C7, C8

multilayer ceramic chip capacitor

4.7

F; 50 V

C10, C11

electrolytic capacitor

1000

F; 63 V

C12, C13

multilayer ceramic chip capacitor

4.7

F; 100 V

C16, C17

multilayer ceramic chip capacitor

120 pF

[1]

C18

multilayer ceramic chip capacitor

82 pF

[1]

C19

multilayer ceramic chip capacitor

110 pF

[1]

C20

multilayer ceramic chip capacitor

56 pF

[1]

L1, L2, L3, L4

1.5 turn 0.8 mm copper wire

D = 3 mm;

length=2mm

L5, L6

5 turn 0.8 mm copper wire

D = 3 mm;

length = 4.5 mm

L7, L8

2.5 turn 0.8 mm copper wire

D = 3 mm;

length=3mm

R1, R2

SMD resistor

100



Philips 1206

R3, R4

SMD resistor

9.1



Philips 1206

T1

semi rigid coax

25

; 160 mm

UT-090C-25

T2

semi rigid coax

25

; 160 mm

UT-141C-25