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參數(shù)資料
| 型號(hào)： | A6150 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | High Efficiency Linear Power Supply with Power Surveillance and Software Monitoring |
| 中文描述： | 高效率線性電源，電源監(jiān)控及軟件監(jiān)控 |
| 文件頁(yè)數(shù)： | 7/14頁(yè) |
| 文件大?。?/td> | 324K |
| 代理商： | A6150 |
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7
A6150
-Closed window: T
CW
is 80 ms
-Open window: T
OW
is 40 ms
-Watchdog reset: T
is 2.5 ms
Note the current consumption increases as the fre-
quency increases.
Watchdog Timeout Period Description
The watchdog timeout period is divided into two parts, a
“closed” window and an “open” window (see Fig. 3) and
is defined by two parameters, T
WD
and the Open Window
Percentage (OWP).
The closed window starts just after the watchdog timer
resets and is defined by T
= T
– OWP(T
).
The open window starts after the closed time window
finishes and lasts till T
+ OWP(T
WD
).The open window
time is defined by T
OW
= 2 x OWP (T
WD
)
For example if T
WD
= 100 ms (actual value) and OWP =
±
20% this means the closed window lasts during first
the 80 ms (T
CW
= 80 ms = 100ms – 0.2 (100 ms)) and
the open window the next 40 ms (T
OW
= 2 x 0.2 (100 ms)
= 40 ms). The watchdog can be serviced between
80 ms and 120 ms after the timer reset. However as the
time base is
±
10% accurate, software must use the
following calculation as the limits for servicing signal TCL
during the open window:
Related to curves (Fig. 10 to Fig. 20), especially Fig. 19
and Fig. 20, the relation between T
and R
could
easily be defined. Let us take an example describing the
variations due to production and temperature:
1.Choice, T
= 26 ms.
2.Related to Fig. 20, the coefficient (T
WD
to R
EXT
) is
1.155 where R
is in k
and T
WD
in ms.
3.R
EXT
(typ.) = 26 x 1.155 = 30.0 k
.
4.
26 ms at +25
°
C
a)
(26
10% = 23.4 ms) (26 + 10% = 28.6 ms)
a)
b)
(23.4
5% = 22.2 ms) (28.6 + 5% = 30.0 ms)
b)
min.: (30.0
20% = 24.0 ms) max.: (22.2 + 20% = 26.7 ms)
Typical TCL period of
(24.0 + 26.7) / 2 = 25.4 ms
The ratio between T
WD
= 26 ms and the (TCL period)
= 25.4 ms is 0.975.
Then the relation over the production and the full
temperature range is, TCL period = 0.975 x T
WD
or
TCL period = 1.155
a) While PRODUCTION value unknown for the custo-
mer when R
≠
123 k
.
b) While operating TEMPERATURE range
-40
°
C
≤
T
≤
+85
°
C.
5. If you fixed a TCL period = 26 ms
0.975
R
EXT
= 26 x 1.155
.
If during your production the T
time can be mea-
sured at T
= + 25
°
C and the
μ
C can adjust the TCL
period, then the TCL period range will be much larger
for the full operating temperature.
T
WD
versus V
OUTPUT
at T
J
= +25
°
C
T
WD
versus R at T
J
= +25
°
C
10’000
1000
100
10
1
3
4
5
V
OUTPUT
[V]
Fig. 8
T
W
6
R = 10 M
R = 1 M
R = 100 k
R = 10 k
R = 1 k
0.1
1
10
100
1000 10’000
1
10
100
1000
10’000
T
W
R[k
]
Fig. 9
3 V
4.8 V
5 V
5.2 V
6 V
0.975 x R
EXT
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