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參數(shù)資料
| 型號： | AAT3174 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | High Current, High Efficiency Charge Pump |
| 中文描述： | 大電流，高效率電荷泵 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 285K |
| 代理商： | AAT3174 |
For examples of standard 1% values where the
LED flash current level is targeted for 700mA, see
Table 3.
Table 3: Open-Drain I/O Example
Resistor Values.
If the I/O port must be configured as an open-drain
PMOS type output, the appropriate equations can
be generated from these same concepts. As done
in the previous example, the necessary values can
then be calculated.
As a reference, the equations applicable to the
PMOS case are:
The value to use for V
IO
must come from the I/O
supply voltage used in the system. 0.7V is the typ-
ical value of the V
RSET
parameter found in the
Electrical Characteristics.
For a push-pull I/O port output configuration, first
calculate the overall R
SET
value needed for the
desired flash level LED current:
Next, choose a reasonable value for R
1
. A value
that is slightly larger than R
SET
, calculated from
above, is appropriate. Calculate R
2
and then calcu-
late the torch mode current level that results:
Once again, the current and resistance values used
in the equations come from the conditions placed on
the I
DX
parameter of the Electrical Characteristics
table. 0.7V is the typical value for the V
RSET
param-
eter. The value to use for V
IO
must come from the
I/O supply voltage used in the system.
Example standard 1% values are provided in Table 4.
Table 4: Push-Pull I/O Example
Resistor Values.
In all of the approaches mentioned, the open-drain
NMOS or PMOS type configurations offer the most
flexibility for current level selection.
When configured as an output, if the I/O port is only
push-pull type, then the equivalent open-drain
NMOS can also be realized. To realize this, acti-
vate the port as output only when driving the line
low. Otherwise, to release the line, set the port to
be tri-stated.
R1
(k
Ω
)
169
165
162
160
R2
(k
Ω
)
1000
1000
1000
1000
I
LED
I
LED
Torch (mA)
Flash (mA)
95
111
124
132
776
792
805
813
I
LED
(torch) = 600mA · 187k
Ω
·
-
R
2
- R
1
R
1
· R
2
V
IO
0.7V · R
2
R
SET
· R
1
R
1
- R
SET
R
2
=
600mA · 187k
Ω
I
LED
(flash)
R
SET
=
V
IO
0.7
I
LED
(torch)
600mA · 187k
Ω
1
R
1
R
2
=
- 1
-
600mA · 187k
Ω
I
LED
(flash)
R
1
=
R1
(k
Ω
)
920
732
649
562
R2
(k
Ω
)
193
205
210
223
I
LED
I
LED
Torch (mA)
Flash (mA)
122
153
173
200
703
701
707
703
AAT3174
High Current, High Efficiency Charge Pump
3174.2006.05.1.2
11
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