Performance Summary; Quick Start Procedure - Linear Analog Devices LT3960 Demo Manual

DEMO MANUAL DC2686A

PERFORMANCE SUMMARY

PARAMETER
Input Voltage
LED Voltage
LED Current
LT3967 ENH Threshold Falling Voltage (V
LT3960 EN/MODE Voltage
Ext LDO Output Voltage
Ext CLK Frequency
LT3967 PWM Dimming Frequency
2
LT3967, LT3960 I C CLK Frequency
LT3967 POR Initial Switch State

QUICK START PROCEDURE

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
in Arduino IDE. Refer to the
detailed instructions on installing and configuring the nec-
essary software and libraries.
1. Launch Arduino IDE.
2. Connect Linduino to computer via USB.
2
Specifications are at T
CONDITION
LT3967, Operating
LT3960, Operating
LT3967, Operating
LT3967, Operating
– ENH) R1 = 10k, R2 = 49.9k
IN
Master Mode
Slave Mode
Low-Power Shutdown Mode
R22 = 392k, R23 = 127k
R13 = 57.6k
Ext CLK to RTSYNC
RADRR[4:1] = 0Ω
DC2026C demo manual for
= 25°C
A
MIN
8
4.5
1.10
2
0.7
0
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
+
6. Connect LED and LED
+ –
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.
TYP MAX
60
5 5.5
56
1.3
1.22 1.34
5
2
0.7
5
350
170
400
LED Off
and GND of DC2686A.
IN
–
from LED driver to DC2686A
UNIT
V
V
V
A
V
V
V
V
V
kHz
Hz
kHz
Rev. 0