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FAN5610 Datenblatt(PDF) 7 Page - Fairchild Semiconductor

Teilenummer FAN5610
Bauteilbeschribung  LED Driver for White, Blue or any Color LED
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5610 Datenblatt(HTML) 7 Page - Fairchild Semiconductor

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PRODUCT SPECIFICATION
FAN5610
REV. 1.0.2 10/28/03
7
Digital Control with PWM (Continued)
A and B are PWM. ILED (Average) =
δ x 21mA where δ is Duty Cycle. (Note 6)
Note:
6. Proportionally select the duty cycle to achieve the desired value of typical LED current between 1mA to 20mA.
B Input (PWM)
A Input (PWM)
ss
ss
ss
0mA
OFF
ILED
ILED (Average) = 0.3 x 21mA = 6.3mA
ILED (Average) = 0.7 x 21mA = 14.7mA
1KHz
30%
Duty Cycle
30%
Duty Cycle
1KHz
70%
Duty Cycle
70%
Duty Cycle
Application Information
As seen in the block diagram, the FAN5610 includes four
independent current regulators able to maintain a program-
mable constant current through LEDs, regardless of their for-
ward voltage. This is true over a wide range of input
voltage starting from VF_max + 0.35V, where VF_max is the
highest forward voltage among the LEDs driven by
FAN5610. The independence of current (LED current
changes less than 1%) with change in VIN and VF for
VIN > VF (MAX) + 0.35V, is shown in the graph below.
Program the LED’s brightness by applying a continuous
voltage level or a PWM signal at the inputs of the built-in
digital to
analog converter (DAC). When a PWM signal is
utilized to drive the DAC inputs, the current through the
LEDs is switched between two levels with the PWM signal
frequency. Consequently, the average current changes with
the duty cycle. The LED current waveform tracks the PWM
signal, so the LEDs brightness depends on the duty cycle.
For white LEDs the spectral composition is optimal at a
current level specified by the manufacturer. The DAC inputs
should be programmed to set the current required to achieve
white LED spectrum and PWM used for dimming. To main-
tain the "purest" white, the current through the LEDs should
be switched between zero and a specified current level
(usually around 20mA) corresponding to the white light
chromaticity coordinate.
Conversion errors are minimized and the best LED to LED
matching is achieved over the entire range of average current
settings, when PWM brightness control is used to modulate
the LED current between zero and the maximum value
(A=1, B=1).
Input Voltage (V)
0
5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
10
15
20
25
Current Regulation Performance
VF2 =3 .6V
VF1 = 3.3 V
VIN > V F ( MAX) + 0.3 5V


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