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FAN5611MPX Scheda tecnica(PDF) 9 Page - Fairchild Semiconductor

Il numero della parte FAN5611MPX
Spiegazioni elettronici  Low-Dropout LED Drivers for White, Blue, or any Color LED
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5611MPX Scheda tecnica(HTML) 9 Page - Fairchild Semiconductor

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© 2003 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9
9
Example 3: Drive white, blue, red, amber LEDs string
Assuming a boost circuit or existing voltage bus, the
FAN561X series of LED drivers can be used to drive a
whole string of LEDs with flexible brightness control via
analog and/or PWM. .
–VDROP < 0.3V
–VIN_MIN = N ¥ VF + VDROP
–VIN _MAX = N ¥ VF + 5.5V
where VIN = existing bus, boost voltage.
Key advantage:
• No need for current matching resistors and discrete
transistor for brightness control.
LED Brightness Control
All of the FAN561X LED drivers feature analog and
PWM controls to give designers flexible brightness con-
trol. These control methods can be applied to the circuit
in two different ways to provide more flexibility than other
solutions. To determine the value of RSET, use the ISET
vs. VCTRL graph in Figure 4.
1. FAN5611
- Analog
Set VCONTROL and RSET for LED current using:
- PWM
VCONTROL = PWM
– Amplitude sets maximum LED current.
– Pulse width controls between 0 and maximum.
2. FAN5612
- Analog
Set VCONTROL and RSET for LED current using:
- PWM - 1
VCONTROL = PWM
– Amplitude sets maximum LED current.
– Pulse width controls between 0 and maximum.
- PWM - 2
Set VCONTROL and RSET for maximum LED current using:
ON/OFF = PWM
– Amplitude has no effect on current.
– Pulse width controls between 0 and maximum.
VIN
ISET
RSET
I1
I2
I3
I4
GND
FAN5613
CTRL
V
CONTROL
'N' number of
LEDs Per Branch
ON/OFF
ENABLE
ISET
RSET
I1
I2
I3
I4
VIN
GND
FAN5611
CTRL
V
CONTROL (3V)
I
LED
200
V
CONTROL
V
CTRL
()
×
R
SET
-------------------------------------------------------------------------
=
RSET
I1
I2
I3
VIN
GND
FAN5612
CTRL
V
CONTROL
ISET
ON/OFF
ENABLE
I
LED
200
V
CONTROL
V
CTRL
()
×
R
SET
-------------------------------------------------------------------------
=
I
LED
200
I
SET
×


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