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參數(shù)資料
| 型號： | STV5109 |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| 中文描述： | 250 的低電流運算，低反向泄露，低噪聲穩(wěn)壓二極管 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 96K |
| 代理商： | STV5109 |
STV5109
5/7
1
TYPICAL APPLICATION
The STV5109 is composed of three independent
amplifiers, each of them including :
– A differential amplifier, the gain of which is fixed
by external feedback resistors,
– A voltage reference,
– A PMOS transistor providing a copy of the cath-
ode current,
– A protection diode against CRT arc discharges.
PC Board Layout
The best performances of the high voltage video
amplifier will be obtained only with a carefully desi-
gned PC board. Output to input capacitance is of
particular importance.
For a single amplifier, the input-output capaci-
tance, in parallel with the relatively high feedback
resis-tance, creates a pole in the closed-loop
transfer function.
A low parasitic capacitance (0.3pF) feedback re-
sistor and HF isolated printed wires are necessary.
Furthermore, capacitive coupling from the output
of an amplifier toward the input of another one may
induce excessive cross-talk.
Power Dissipation
The power dissipation consists of a static part and
a dynamic part. The static dissipation is a function
of V
OUT
(DC), V
DD
and R
F
. Reasonable approxi-
mation of the static power can be calculated by the
following equation:
3V
V
V
–
(
40K
The dynamic dissipation depends on the signal
spectrum, V
OUT
, V
DD
and the load capacitance.
For a sine wave, dynamic dissipation is
P
d
= 3 x F x C
L
x V
OPP
x 0.8 x V
DD
.
The load capacitance C
L
includes CRT and board
capacitance (10pF), and amplifier output capaci-
tance (8pF) : total C
L
value is about 20pF.
Figure 3. Application Example
Ps
)
-----------------------------------------------
3V
V
-------------------------------------------------
V
–
(
)
R
F
+
=
5
2
V
REF
CATHODE 1
4
W
1k
W
6
W
4.7k
W
V
CC
12V
100nF
100
m
F
100nF
V
DD
220V
10
m
F
1.2k
W
4
V
DD
8
5
9
7
6
4
1.8k
W
STV5109
CATHODE 2
V
DD
12
10
11
3
CATHODE 3
V
DD
15
13
14
1
CUT-OFF
SAMPLING
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