Test and application information, Dissipation, Video output amplifier tda6106q – Philips TDA6106Q User Manual
Page 8
1997 Mar 03
8
Philips Semiconductors
Product specification
Video output amplifier
TDA6106Q
TEST AND APPLICATION INFORMATION
C
par
= 150 fF.
Fig.5 Test circuit with feedback factor
1
⁄
116
.
handbook, full pagewidth
6
200 V
9
4
5
3
8
TDA6106Q
Rfb
R10 100 k
Ω
Vom
Cpar
Cn
Vin
4 V
A
GND
R1
50
Ω
0.98 mA
C2
22
µ
F
C1
22
nF
R9
866
Ω
560 pF
100 nF
C6
C8
6.8 pF
C7
3.2 pF
C9
136 pF
R3
20 M
Ω
R2
1 M
Ω
probe
MBG344
Dissipation
With respect to dissipation, distinction must be made
between static dissipation (independent of frequency) and
dynamic dissipation (proportional to frequency).
The static dissipation of the TDA6106Q is due to supply
currents and load currents in the feedback network and
CRT.
Where:
R
fb
= value of feedback resistor.
I
oc
= DC value of cathode current.
P
stat
V
DD
I
DD
V
oc
I
oc
V
of
V
of
R
fb
--------
Ч
–
Ч
+
Ч
=
The dynamic dissipation equals:
Where:
C
L
= load capacitance.
C
fb
= feedback capacitance.
C
int
= internal load capacitance (
≈
4 pF).
f = input frequency.
V
o(p-p)
= output voltage (peak-to-peak value).
b = non-blanking duty-cycle.
The IC must be mounted on the picture tube base print to
minimize the load capacitance (C
L
).
P
dyn
V
DD
C
L
C
fb
C
int
+
+
(
)
×
f
V
o p
p
–
(
)
×
b
Ч
Ч
=