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參數(shù)資料
| 型號： | SC604AIMLTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Low Noise, High Efficiency Regulated White LED Driver |
| 中文描述： | 低噪聲，高效率調(diào)控白光LED驅(qū)動器 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 375K |
| 代理商： | SC604AIMLTRT |
10
2005 Semtech Corp.
www.semtech.com
SC604A
POWER MANAGEMENT
Methods for Setting LED Current (Cont.)
V
J
D
A
]
I
D
E
L
]
A
m
[
V
J
D
A
]
I
D
E
L
]
A
m
[
0
0
0
2
3
0
0
6
8
1
0
0
1
7
2
0
0
7
3
1
0
0
2
1
2
0
0
8
7
0
0
3
5
2
0
0
9
1
0
0
4
0
2
0
0
0
1
0
0
5
3
1
0
5
1
0
Table 3 - Analog Voltage for LED Current Control
Figure 1 - Analog Voltage for LED Current Control
Figure 2 - 3 Bit LED Current Control with Open Drain
Method 2.
The example circuit in Figure 1 uses a 16.5k
resistor
and an analog input DC voltage, V
, which varies from 1.2V to 0V
to control LED current from 1mA to 30mA. Table 3 shows the
resulting output. If necessary, the analog V
voltage can be
sourced from a voltage higher than 1.2V, but the source must be
divided down so that the V
mode will not exceed 1.2V. For lower
current applications and for higher resolution, a larger resistor
may be substituted in this circuit. PWM applications are also
possible with this circuit by application of RC filtering. (Consult
with Semtech for detailed application support).
Method 3.
The circuit in Figure 2 uses open drain NMOS transistors
to set an equivalent resistance for R
. Parallel combinations are
switched on and off for R1, R2 and R3. R4 is always connected,
so that a minimum value of LED current can be maintained at
1.5mA.
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相關(guān)代理商/技術(shù)參數(shù) |
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| SC604-RL1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Speech And Music Processor |
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