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| 型號： | 935173950112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PZFM9 |
| 封裝： | PLASTIC, SOT-111, DIL-BENT-SIL, 9 PIN |
| 文件頁數(shù)： | 3/18頁 |
| 文件大?。?/td> | 114K |
| 代理商： | 935173950112 |
1995 Feb 07
11
Philips Semiconductors
Preliminary specication
Video output amplier
TDA6111Q
TEST AND APPLICATION INFORMATION
Dissipation
Regarding dissipation, distinction must first be made
between static dissipation (independent of frequency) and
dynamic dissipation (proportional to frequency).
The static dissipation of the TDA6111Q is due to high and
low voltage supply currents and load currents in the
feedback network and CRT.
The static dissipation equals:
Rfb = value of feedback resistor.
Ioc = DC value of cathode current.
With Vfb =Voc = 100 V, Rfb =68k, Ioc = 0.6 mA and
other typical conditions as mentioned in Chapter
“Characteristics”, the static dissipation Pstat = 2.0 W.
P
stat
V
DDL
I
DDL
V
DDH
I
DDH
V
oc
I
oc
V
fb
V
fb
R
fb
--------
×
–
×
+
×
+
×
=
The dynamic dissipation equals:
Pdyn =VDDH × (CL +Cfb +Cint) × fi × Vo(p-p) ×δ
CL = load capacitance.
Cfb = feedback capacitance (≈ 150 fF).
Cint = internal load capacitance (≈ 4 pF).
fi = input frequency.
Vo(p-p) = output voltage (peak-to-peak value).
δ = non-blanking duty-cycle (≈ 0.8).
With CL = 10 pF, Cfb = 0, Cint = 4 pF, fi = 8 MHz
(simulation of worst-case noise), Vo(p-p) = 100 V and
δ = 80% then Pdyn = 1.8 W
The IC must be mounted on the picture tube base print to
minimize the load capacitance (CL).
The total power dissipation, Ptot =Pstat +Pdyn thus
amounts to 3.6 W under given conditions.
From Tj =Tamb +Ptot × Rth j-a <Tj(max) = 150 °C, Rth j-a of
the package and heatsink together must be < 24 K/W.
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