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LT3476EUHF-PBF Datasheet(PDF) 10 Page - Linear Technology

Part # LT3476EUHF-PBF
Description  High Current Quad Output LED Driver
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3476EUHF-PBF Datasheet(HTML) 10 Page - Linear Technology

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LT3476
10
3476fa
APPLICATIO S I FOR ATIO
Programming the LED Current
The LED Current is programmed using an external sense
resistor in series with the load. This method allows flex-
ibility in driving the load (i.e., sensing one of several
parallel strings) while maintaining good accuracy. The
VADJ input sets the voltage regulation threshold across
the external sense resistor between 10mV and 120mV.
A 1.05V reference output (REF) is provided to drive the
VADJ pins either through a resistor divider, or connected
directly to REF to give the full-scale threshold of 105mV.
A DAC may also be used to drive the VADJ pins. The VADJ
pins should not be left open. If the VADJ input is connected
to a voltage higher than 1.25V, the default regulation
threshold across CAP and LED is 125mV (typ). The VADJ
pin can also be used in conjunction with a PTC thermistor
to provide overtemperature protection for the LED load
as shown in Figure 2.
Dimming Control
There are two methods to control the current source for
dimming using the LT3476. The first method, popular
with LED applications, uses the PWM pin to modulate the
current source between zero and full current to achieve
a precisely programmed average current. To make this
method of current control more accurate, during the qui-
escent phase the switch demand current is stored on the
VC node. This feature minimizes recovery time when the
PWM signal goes high. The minimum PWM on- or off-time
will depend on the choice of operating frequency through
the RT input pin. For best current accuracy, the minimum
PWM low or high time should be at least ten switching
cycles. This guideline has two reasons: first to allow the
output to reach steady state before shutting off, and second
because the oscillator is not synchronized to the PWM
signal and there may be as much as one switching cycle
delay from PWM going high to the start of switching. This
delay, however, does not apply to the negative transition
of the PWM signal. The minimum PWM low/high time can
be reduced to five switching cycles if a disconnect switch
is used in the LED current path.
The second method of dimming control uses the VADJ pin
to linearly adjust the current sense threshold during the
PWM high state. The LED current programming feature
augments the PWM dimming control, possibly increasing
total dimming range by a factor of ten.
VREF
20k
25k
470
PTC
VADJ1-4
1.05V
3476 F01
Figure 2. Overtemperature Protect Circuit


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