參數(shù)資料
型號(hào)： LQH2MCN150K02
廠商： Linear Technology Corporation
英文描述： 20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN
中文描述： 20mA的LED驅(qū)動(dòng)器和3毫米的OLED驅(qū)動(dòng)器集成肖特基x 2mm DFN封裝
文件頁(yè)數(shù)： 11/24頁(yè)
文件大?。?/td> 449K
代理商： LQH2MCN150K02
LT3498
11
3498f
The LED current can be set by:
mV
R
SENSE
Feedback voltage variation versus control voltage is
given in the Typical Performance Characteristics.
I
V
I
V
LED
LED
CT
R
≈
>
≈
200
1 5
.
1
,
when V
CTRL1
RL
SENSE
V
1
1
6 25
.
1 25
.
,
when V
CTRL1
<
Using a Filtered PWM Signal
A filtered PWM signal can be used to control the bright-
ness of the LED string. The PWM signal is filtered (Figure 4)
by a RC network and fed to the CTRL1 pin.
The corner frequency of R1, C1 should be much lower
than the frequency of the PWM signal. R1 needs to be
much smaller than the internal impedance of the CTRL1
pin which is 10M
Ω
(typ).
APPLICATIONS INFORMATION—LED DRIVER
Programming LED Current
The feedback resistor (R
SENSE1
) and the sense voltage
(V
CAP1
– V
LED1
) control the LED current. The CTRL1 pin
controls the sense reference voltage as shown in the
Typical Performance Characteristics. For CTRL1 higher
than 1.5V, the sense reference is 200mV, which results in
full LED current. To have accurate LED current, precision
resistors are preferred (1% is recommended). The formula
and table for R
SENSE
selection are shown below.
mV
I
LED
Table 4: R
SENSE1
Value Selection for 200mV Sense
I
LED
(mA)
5
10
15
20
R
SENSE
1
200
=
R
SENSE1
(
Ω
)
40
20
13.3
10
Dimming Control
There are three different types of dimming control circuits.
The LED current can be set by modulating the CTRL1 pin
with a DC voltage, a filtered PWM signal or directly with
a PWM signal.
Using a DC Voltage
For some applications, the preferred method of brightness
control is a variable DC voltage to adjust the LED current.
The CTRL1 pin voltage can be modulated to set the dim-
ming of the LED string. As the voltage on the CTRL1 pin
increases from 0V to 1.5V, the LED current increases from
0 to I
LED
. As the CTRL1 pin voltage increases beyond 1.5V,
it has no effect on the LED current.
Figure 4. Dimming Control Using a Filtered PWM Signal
LT3498
CTRL1
C1
0.1
μ
F
PWM
10kHz TYP
3498 F04
R1
100k
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