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LM3502 Fiches technique(PDF) 13 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM3502
Description  Step-Up Converter for White LED Applications
PDF  18 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3502 Fiches technique(HTML) 13 Page - National Semiconductor (TI)

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Application Information
WHITE LED CURRENT SETTING
The LED current is set using the following equation:
20131730
I
LED: White LED Current.
V
Fb:
Feedback Pin Voltage. V
Fb = 0.25V, Typical.
R1:
Currrent Setting Resistor.
WHITE LED DIMMING
For dimming the white LED string with a pulse-width-
modulated (PWM) signal on the Cntrl pin, care must taken to
balance the tradeoffs between audible noise and white LED
brightness control. For best PWM duty cycle vs. white LED
current linearity, the PWM frequency should be between
200Hz and 500Hz. Other PWM frequencies can be used, but
the linearity over input voltage and duty cycle variation will
not be as good as what the 200Hz to 500Hz PWM frequency
spectrum provides. To minimize audible noise interference, it
is recommended that a output capacitor with minimal sus-
ceptibility to piezoelectric induced stresses be used for the
particular applications that require minimal or no audible
noise interference.
If V
OUT2 is not used , En2 must be grounded
20131735
FIGURE 5.
www.national.com
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