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參數(shù)資料
| 型號： | LM3590 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | LM3590Series White LED Driver |
| 中文描述： | LM3590Series白光LED驅(qū)動器 |
| 文件頁數(shù)： | 8/9頁 |
| 文件大?。?/td> | 205K |
| 代理商： | LM3590 |
Application Information
(Continued)
2.
Brightness control can be implemented by pulsing a
signal at the EN pin. LED brightness is proportional to
the duty cycle (D) of the PWM signal. For linear bright-
ness control over the full duty cycle adjustment range,
the PWM frequency (f) should be limited to accommo-
date the turn-on time (T
ON
= 50μs) of the device.
D x (1/f)
>
T
ON
f
MAX
= D
MIN
÷ T
ON
If the PWM frequency is much less than 100Hz, flicker
may be seen in the LEDs. For the LM3590, zero duty
cycle will turn off the LEDs and a 50% duty cycle will
result in an average I
OUT
being half of the programmed
LED current. For example, if R
SET
is set to program
15mA, a 50% duty cycle will result in an average I
LED
of
7.5mA.
POWER DISSIPATION
The power dissipation (P
) and junction tempera-
ture (T
) can be approximated with the equations below. P
IN
is the product of the input current and input voltage, P
IOUT
is
Application Circuits
the power consumed by the LEDs, T
is the ambient tem-
perature, and
θ
is the junction-to-ambient thermal resis-
tance for the SOT23-5 package. V
is the input voltage to
the LM3590, V
is the sum of the forward voltages of
LEDs connected to the I
OUT
pin, and I
OUT
is the programmed
LED current.
P
DISSIPATION
= P
IN
- P
IOUT
= (V
IN
x I
OUT
) (V
IOUT
x I
OUT
)
T
J
= T
A
+ (P
DISSIPATION
x
θ
JA
)
The junction temperature rating takes precedence over the
ambient temperature rating. The LM3590 may be operated
outside the ambient temperature rating, so long as the junc-
tion temperature of the device does not exceed the maxi-
mum operating rating of 110C. The maximum ambient tem-
perature rating must be derated in applications where high
power dissipation and/or poor thermal resistance causes the
junction temperature to exceed 110C.
Figure 2
shows how to program the LED current to four
different DC levels using two digital logic signals. The pro-
grammed LED current is a function of the equivalent resis-
tance on the I
SET
pin (R
ISET
), resulting from the logic signals
on SET1 and SET2. Example values for R1, R2, and RSET
an the resulting 4 current levels are shown below.
TABLE 3. Digital LED Current Programming
EN
0
1
1
1
1
SET1
X
1
1
0
0
SET2
X
1
0
1
0
R
ISET
Shutdown
R
SET
i
R
1
i
R
2
R
SET
i
R
1
R
SET
i
R
2
R
SET
Example R
ISET
Shutdown
31.6k
i
15.k
i
31.6k
31.6k
i
15.k
31.6k
i
31.6k
31.6k
Example I
OUT
Shutdown
16mA
12mA
8mA
4mA
20081313
FIGURE 2. Example: R
1
= 15.8k
, R
2
= 31.6k
, R
SET
= 31.6k
L
www.national.com
8
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