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| LT3497 Datasheet, PDF (6/20 Pages) Linear Integrated Systems – Dual Full Function White LED Driver with Integrated Schottky Diodes | |||
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LT3497
PIN FUNCTIONS
LED1 (Pin 1): Connection point for the anode of the ï¬rst
LED of the ï¬rst set of LEDs and the sense resistor (RSENSE1).
The LED current can be programmed by:
ILED1
=
200mV
RSENSE1
CTRL1 (Pin 2): Dimming and Shutdown Pin. Connect
CTRL1 below 50mV to disable converter 1. As the pin volt-
age is ramped from 0V to 1.5V, the LED current ramps from
0 to (ILED1 = 200mV/RSENSE1). The CTRL1 pin must not
be left ï¬oating.
GND (Pin 3): Connect the GND pin to the PCB system
ground plane.
CTRL2 (Pin 4): Dimming and Shutdown Pin. Connect
CTRL2 below 50mV to disable converter 2. As the pin volt-
age is ramped from 0V to 1.5V, the LED current ramps from
0 to (ILED2 = 200mV/RSENSE2). The CTRL2 pin must not
be left ï¬oating.
LED2 (Pin 5): Connection point for the anode of the ï¬rst
LED of the second set of LEDs and the sense resistor
(RSENSE2). The LED current can be programmed by:
ILED2
=
200mV
RSENSE2
CAP2 (Pin 6): Output of Converter 2. This pin is connected
to the cathode of internal Schottky diode 2. Connect the
output capacitor to this pin and the sense resistor (RSENSE2)
from this pin to LED2 pin.
SW2 (Pin 7): Switch Pin. Minimize trace area at this pin
to minimize EMI. Connect the inductor at this pin.
VIN (Pin 8): Input Supply Pin. This pin must be locally
bypassed.
SW1 (Pin 9): Switch Pin. Minimize trace area at this pin
to minimize EMI. Connect the inductor at this pin.
CAP1 (Pin 10): Output of Converter 1. This pin is connected
to the cathode of internal Schottky diode 1. Connect the
output capacitor to this pin and the sense resistor (RSENSE1)
from this pin to LED1 pin.
Exposed Pad (Pin 11): Ground. Must be soldered to
PCB.
3497f
6
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