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ISL29000
TABLE 1. V DD = 5V, MAXIMUM OUTPUT VOLTAGE = 4.7V
Next, the value of R 2 can be calculated based on the
ILLUMINATION RANGE
(LUX)
0 to 10
RLOAD
(k Ω )
7830
CURRENT OUT
(μA)
0 to 0.6
maximum output current coming from the ISL29000 under
the application's maximum light exposure. Suppose the
current has been determined to be about 125μA. Thus, R 2
can be calculated approximately using Equations 5 and 6:
R 2 = ? ------------------ ? = 10k Ω
0 to 200
0 to 500
0 to 1,000
0 to 10,000
392
157
80
8.00
0 to 12
0 to 30
0 to 60
0 to 600
1.25V
? 125 μ A ?
and
R 1 = 11 × R 2 = 110k Ω
(EQ. 5)
(EQ. 6)
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 ISL29000 can be used to control the
brightness input of CCFL inverters. Likewise it can interface
In Figure 10, user adjustable bias control has been added to
allow control over the minimum and maximum output
voltage. This allows the user to adjust the output brightness
to personal preference over a limit range via the 3V PWM
control.
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
3V TO 5V
SUPPLY VOLTAGE
3V PWM CONTROL
sensor, light aperture hole size and use of a light pipe or
bezel are critical in determining the response of the
VDO
R 2
110k
ISL29000 for a given exposure of light.
ISL29000
TO INVERTER BRIGHTNESS
The example in Figure 9 shows a fully automatic dimming
solution with no user interaction. Choose R 1 and R 2 values
for any desired minimum brightness and slope. Choose C 1
to adjust response time and to filter 50/60Hz room lighting.
EN
GND
OUT
R 1
10k
INPUT OR LED DRIVER
CONTROLLER
C 1
25μF
For example, suppose you wish to generate an output
voltage from 0.25V to 1.25V to drive the input of an LED
driver controller. The 0.25V represents the minimum LED
brightness and 1.25V represents the maximum. The 1st step
would be to determine the ratio of R 1 and R 2 :
FIGURE 10. AUTOMATIC DIMMING SOLUTION WITH
ADJUSTABLE BIAS CONTROL
R 1 = R 2 × ? ---------------- – 1 ? = 11 × R 2
3.0V
? 0.25V ?
(EQ. 4)
Figure 11 shows how a fully manual override can be quickly
added by using the EN pin.
3V TO 5V
SUPPLY VOLTAGE
3V DC VOLTAGE
3V TO 5V
SUPPLY VOLTAGE
3V PWM CONTROL
VDO
EN
ISL29000
OUT
GND
R 1
10k
R 2
110k
TO INVERTER BRIGHTNESS
INPUT OR LED DRIVER
CONTROLLER
C 1
25μF
ENABLE/
DISABLE
CONTROL
EN
VDO
ISL29000
OUT
GND
R 1
10k
R 2
110k TO INVERTER
BRIGHTNESS
INPUT OR LED
DRIVER
CONTROLLER
C 1
25μF
FIGURE 9. AUTOMATIC DIMMING SOLUTION
FIGURE 11. AUTOMATIC DIMMING SOLUTION WITH
ADJUSTABLE BIAS CONTROL AND MANUAL
OVERRIDE
5
FN6117.6
September 2, 2008
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