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參數(shù)資料
| 型號： | RBHV57009DG |
| 廠商： | SUPERTEX INC |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | 64-Channel Serial To Parallel Converter With P-Channel Open Drain Controllable Output Current |
| 中文描述： | DC PLASMA DISPLAY DRIVER, CQFP80 |
| 封裝： | CERAMIC, QFP-80 |
| 文件頁數(shù)： | 7/7頁 |
| 文件大?。?/td> | 486K |
| 代理商： | RBHV57009DG |
7
HV57009
I
OUT
HV
OUT
V
DD
V
REF
I
REF
R
EXT
+IN
-IN
R
D
*
10K
C
D
*
390pF
HV570
Logic
To other
outputs
- +
0.1
μ
F
V
BP
V
SS
V
REF
I
OUT
HV
OUT
V
DD
0.1
μ
F
V
BP
I
REF
R
EXT
+IN
-IN
R
D
*
10K
C
D
*
390pF
HV570
Logic
To other
outputs
- +
V
SS
Since I
OUT
= I
REF
=
Therefore, if I
OUT
= 2mA and V
REF
= -5V
→
R
EXT
= 2.5K
.
If I
OUT
= 1mA and R
EXT
= 1K
→
V
REF
= -1V.
If R
>10K
, add series network R
D
and C
D
to ground for
stability as shown.
This control method behaves linearly as long as the operational
amplifier is not saturated. However, it requires a negative power
source and needs to provide a current I
REF
= I
OUT
for each HV570
chip being controlled.
If HV
≥
+1V, the HV
cascode may no longer operate as a
perfect current source, and the output current will diminish. This
effect depends on the magnitude of the output current.
Given I
OUT
and V
REF
, the R
EXT
can be calculated by using:
R
= V
REF
=
V
REF
I
REF
I
OUT
The intersection of a set of I
and V
values can be located
in the graph shown below. The value picked for R
must always
be in the shaded area for linear operation. This control method
has the advantage that V
is positive, and draws only leakage
current. If R
> 10K, add series network R
D
and C
D
to ground
for stability as shown.
Note: Lower reference current I
REF
, results in higher distortion,
I
CS
, on the output.
*Required if R
> 10K or R
EXT
is replaced by a constant
current source.
Typical Current
Programming Circuits
Figure 8b:
Positive Control
Figure 8a:
Negative Control
V
REF
R
EXT
1
2
3
4
5
3
4
5
6
7
8
2
1
0
I
VREF (V)
100
250
500
REXT = 1K
5K
2K
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 FAX: (408) 222-4895
www.supertex.com
03/12/02
2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
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