2
Rev. 0
PARAMETER
CONDITION
MIN
TYP
MAX
UNIT
Input Voltage
LT3967, Operating
LT3960, Operating
8
4.5
5
60
5.5
V
V
LED Voltage
LT3967, Operating
56
V
LED Current
LT3967, Operating
1.3
A
LT3967 ENH Threshold Falling Voltage (V
IN
– ENH)
R1 = 10k, R2 = 49.9k
1.10
1.22
1.34
V
LT3960 EN/MODE Voltage
Master Mode
Slave Mode
Low-Power Shutdown Mode
2
0.7
0
5
2
0.7
V
V
V
Ext LDO Output Voltage
R22 = 392k, R23 = 127k
5
V
Ext CLK Frequency
R13 = 57.6k
350
kHz
LT3967 PWM Dimming Frequency
Ext CLK to RTSYNC
170
Hz
LT3967, LT3960 I
2
C CLK Frequency
400
kHz
LT3967 POR Initial Switch State
RADRR[4:1] = 0Ω
LED Off
In order to properly function, DC2686A must be interfaced
with a low output capacitance Buck LED driver or floating
buck-mode LED driver. The input power supply to both
LED driver and DC2686A must be set to at least 6V higher
than each LT3967 SRC channel source voltage. This demo
manual highlights interfacing DC2686A with a buck LED
driver. For buck mode connections, refer to the LT3967
data sheet.
DC2686A works with a Linduino microcontroller board
(DC2026C) and can be connected to a PC via USB. This
allows DC2686A to be controlled via serial port interface
detailed instructions on installing and configuring the nec-
essary software and libraries.
1. Launch Arduino IDE.
2. Connect Linduino to computer via USB.
3. Download the Linduino code and library files from the
DC2686A web page
4. Upload the code to the connected Linduino
demo circuit.
5. With input power off, connect the input power supply
from LED Driver to V
IN
and GND of DC2686A.
6. Connect LED
+
and LED
–
from LED driver to DC2686A
LED
+
and LED
–
terminals.
7. Connect 8 LEDs as shown in Figure 1 and Figure 2.
8. Connect Linduino to DC2686A using one of the two
methods shown in Figure 1 and Figure 2.
9. Open up the serial monitor inside Arduino IDE.
10. Turn on input power supply.
11. Use command line interface in serial monitor to con-
trol and monitor LEDs.
QUICK START PROCEDURE
PERFORMANCE SUMMARY
Specifications are at T
A
= 25°C
