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LT3466 Fiches technique(PDF) 6 Page - Linear Technology

No de pièce LT3466
Description  Dual Full Function White LED Step-Up Converter with Built-In Schottky Diodes
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LT3466 Fiches technique(HTML) 6 Page - Linear Technology

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LT3466
3466f
PI FU CTIO S
VOUT1 (Pin 1): Output of Converter 1. This pin is connected
to the cathode of the internal Schottky diode. Connect an
output capacitor from this pin to ground.
SW1 (Pin 2): Switch Pin for Converter 1. Connect the
inductor at this pin.
VIN (Pin 3): Input Supply Pin. Must be locally bypassed
with a 1
µF, X5R or X7R type ceramic capacitor.
SW2 (Pin 4): Switch Pin for Converter 2. Connect the
inductor at this pin.
VOUT2 (Pin 5): Output of Converter 2. This pin is connected
to the cathode of the internal Schottky diode. Connect an
output capacitor from this pin to ground.
FB2 (Pin 6): Feedback Pin for Converter 2. The nominal
voltage at this pin is 200mV. Connect cathode of the lowest
LED and the feedback resisitor at this pin. The LED current
can be programmed by :
ILED2 ≈ (200mV/RFB2), when VCTRL2 > 1.6V
ILED2 ≈ (VCTRL2/5 • RFB2), when VCTRL2 < 1V
CTRL2 (Pin 7): Dimming and Shutdown Pin for Con-
verter 2. Connect this pin to ground to disable the con-
verter. As the pin voltage is ramped from 0V to 1.6V, the
LED current ramps from 0 to ILED2 (= 200mV/RFB2). Any
voltage above 1.6V does not affect the LED current.
RT (Pin 8): Timing Resistor to Program the Switching
Frequency. The switching frequency can be programmed
from 200KHz to 2MHz.
CTRL1 (Pin 9): Dimming and Shutdown Pin for Con-
verter 1. Connect this pin to ground to disable the con-
verter. As the pin voltage is ramped from 0V to 1.6V, the
LED current ramps from 0 to ILED1 (= 200mV/RFB1). Any
voltage above 1.6V does not affect the LED current.
FB1 (Pin 10): Feedback Pin for Converter 1. The nominal
voltage at this pin is 200mV. Connect cathode of the lowest
LED and the feedback resistor at this pin. The LED current
can be programmed by :
ILED1 ≈ (200mV/RFB1), when VCTRL1 > 1.6V
ILED1 ≈ (VCTRL1/5 • RFB1), when VCTRL1 < 1V
Exposed Pad (Pin 11): The Exposed Pad must be soldered
to the PCB system ground.


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