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ISL29006, ISL29007, ISL29008
FN6282 Rev 2.00 Page 8 of 12
October 8, 2015
Application Information
Light-to-Current and Voltage Conve r sion
The ISL29006, ISL29007 and ISL29008 have responsiveness
that is directly proportional to the intensity of light intercepted
by the photodiode arrays. Conversion rate is independent of
the light sources (fluorescent light, incandescent light or direct
sunlight).
Here, IOUT is the output current in µA, and E is the input light in
lux.
For some applications, a load resistor is added between the
output and the ground, as shown in Figure 1. The output
voltage can be expressed in Equation 2:
Here, VOUT is the output voltage and RL is the value of the
external load resistor. The compliance of the ISL29006's
output circuit may result in premature saturation of the output
current and voltage when an excessively large RL is used. The
output compliance voltage is 300mV below the supply voltage
as listed in VO-MAX of the “Electrical Specifications” table on
page 3.
In order to have the linear relationship between the input light
and the output current and voltage, a proper resistor value (i.e.,
gain) should be picked for a specific input light range. The
resistor value can be picked according to Equation 3:
Here, VSUP is the supply voltage and ERANGE is the specific
input light range for an application. For example, an indoor light
ranges typically from 0 lux to 1,000 lux. A resistor value of
270k for 3V supply voltage can be used. For a small light
range, a large resistor value should be used to achieve better
sensitivity; for a large light range, a small resistor value should
be used to prevent non-linear output current and voltage.
Application Examples
The following examples present from fully automatic to fully
manual override implementations. These guidelines are
applicable to a wide variety of potential light control
applications. The ISL29006, ISL29007 and ISL29008 can be
used to control the brightness input of CCFL inverters.
Likewise, it can interface well with LED drivers. In each specific
application, it is important to recognize the target environment
and its ambient light conditions. The mechanical mounting of
the sensor, light aperture hole size and use of a light pipe or
bezel are critical in determining the response of the ambient
light detector for a given exposure of light.
The example in Figure 20 shows a fully automatic dimming
solution with no user interaction. Choose R1 and R2 values for
any desired minimum brightness and slope. Choose C1 to
adjust response time and to filter 50/60Hz room lighting. For
example, suppose you wish to generate an output voltage from
0.25V to 1.2V to drive the input of an LED driver controller. The
0.25V represents the minimum LED brightness and 1.2V
represents the maximum. The 1st step would be to determine
the ratio of R1 and R2 in Equation 4:
Next, the value of R2 can be calculated based on the
maximum output current coming from the ISL29006 under the
application's maximum light exposure. Suppose the current
has been determined to be about 2µA. Thus, R2 can be
approximately calculated using Equations 5 and 6:
and Equation 6:
In Figure 20, the 3VDC supply can be replaced with a user
adjustable bias control, such as 3V PWM control to allow
control over the minimum and maximum output voltage.
Figure 21 shows that ISL29006 is used to provide automatic
dimming control.
Short Circuit Current Limit
The ISL29006, ISL29007 and ISL29008 do not limit the output
short circuit current. If the output is directly shorted to the
ground continuously, the output current could easily increase
for a strong input light such that the device may be damaged.
Maximum reliability is maintained if the output continuous
current never exceeds 6mA by adding a load resistor at the
output. This limit is set by the design of the internal metal
interconnects.
IOUT
1.6A
100lux
-------------------
E=(EQ. 1)
VOUT IOUT RL
1.6A
100lux
-------------------
ER
L
== (EQ. 2)
RL
VSUP 0.3V–
1.6A
--------------------------------------- 100lux
ERANGE
------------------------
=(EQ. 3)
R1R2
3.0V
0.25V
----------------1–
11 R2
== (EQ. 4)
3V TO 5V
SUPPLY VOLTAGE 3V DC VOLTAGE
ISL29006
ISRC
GND
VDD
TO INVERTER BRIGHTNESS
CONTROLLER
C1
R2
R1
FIGURE 20.
60k 25µF
660k
INPUT OR LED DRIVER
R2
1.2V
2A
------------
60k== (EQ. 5)