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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)： | 4/18頁 |
| 文件大?。?/td> | 375K |
| 代理商： | SC604AIMLTRT |
4
2005 Semtech Corp.
www.semtech.com
SC604A
POWER MANAGEMENT
Definitions
I
LED
Accuracy
The LED current is determined by the R
resistor (I
vs. R
data is found on pages 9 and 10). This term
does not include the tolerance of the resistor R
. If
maximum accuracy is required, a precision resistor is
needed. To calculate the error I
LED-ERR
[%], use the formula
I
LED-ERR
[%] = ±
Current Matching
Current Matching refers to the difference in current from
one LED to the next. The
I between any two LEDs will
meet this requirement. To calculate the error I
,
first identify the highest and lowest value of the 4 LED
currents, and use the formula:
I
LED-LED-ERR
[%] =
or
which reduces to ±
1x Mode, 1.5x Mode and 2x Mode
1x Mode, 1.5x Mode and 2x Mode all refer to the charge
pump configuration. These modes boost the battery input
voltage and ensure there is enough voltage at V
so
that the regulated current will flow through the LEDs and
return via the I
LED
pins.
I
LED
(
)
MEASURED
ILED
ILED
-
%
100
I
MAX
I
MAX
+ I
MIN
- 1
100%
2
I
MIN
I
MAX
+ I
MIN
- 1
100%
2
I
MIN
I
MIN
100%
I
MAX
I
MAX
+
Input Current
The total input current of the SC604A is a function of
the sum of the LED currents, the charge pump mode
and the quiescent current. The quiescent current trend
is charted on page 12 and used to calculate I
IN
in the
following examples.
I
IN
= I
OUT
z
Mode + I
Q
=
(I
LED1
+I
LED2
+I
LED3
+I
LED4
)
z
Mode + I
Q
Example 1:
Mode = 1x, I
Q
= 2.4mA,
I
LED1
+I
LED2
+I
LED3
+I
LED4
= 4
z
15mA = 60mA
Answer 1:
I
IN
= I
OUT
62.4mA
z
Mode + I
Q
= 60mA
z
1 + 2.4mA =
Example 2:
Mode = 1.5x, I
Q
= 2.4mA,
I
LED1
+I
LED2
+I
LED3
+I
LED4
= 4
z
15mA = 60mA
Answer 2:
I
IN
= I
OUT
z
Mode + I
Q
= 60mA
z
1.5 + 2.4mA =
92.4mA
Mode Transition Voltage
Mode transition voltage refers to the input voltage at
the point just before the charge pump changes from a
weaker mode to a stronger mode. V
TRANS1X
is the
transition from 1x to 1.5x mode, and V
is the
transition from 1.5x to 2x mode. Equations for V
TRANS1X
and V
TRANS1.5X
are given on page 7.
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|---|---|
| SC604EVB | Low Noise, High Efficiency Regulated White LED Driver |
| SC605-R | Speech And Music Processor |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC604EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Noise, High Efficiency Regulated White LED Driver |
| SC604-R | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Speech And Music Processor |
| 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 |
| SC605 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Charge Pump Flash LED Driver |
| SC605EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Charge Pump Flash LED Driver |
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