Analog Devices DC2630A, Manual

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2
DEMO MANUAL DC2630A
Rev. 0
PARAMETER CONDITION MIN TYP MAX UNIT
Input Voltage V
IN
Range Operating
Transient
9 18
36
V
V
Switching Frequency (f
SW
) R30 = 47.5kΩ, MPHASE = OFF 2 MHz
I
LED1
, I
LED2
, I
LED3
, I
LED4
R3 = R16 = R22 = R26 = 2Ω 125 mA
Open LED Voltage V
OUT
R4 = R17 = R23 = R27 = 1MΩ
R5 = R18 = R24 = R28 = 21.5kΩ
57 V
Efficiency (100% PWM DC) V
IN
= 12.0V, f
SW
= 2MHz, V
LED
= 50V
I
LED1
= I
LED2
= I
LED3
= I
LED4
= 125mA
86.7%
V
LED
Range R4 = R17 = R23 = R27 = 1MΩ
R5 = R18 = R24 = R28 = 21.5kΩ
40 56 V
I
2
C Minimum PWM Dimming Frequency R30 = 47.5kΩ, SCL[2:0] = 0b111 244 Hz
V
IN
Undervoltage Lockout (UVLO) Falling R2 = 499kΩ, R1 = 84.5kΩ 8.5 V
V
IN
Enable Turn-On (EN) Rising R2 = 499kΩ, R1 = 84.5kΩ 9.7 V
Note: Make sure that the voltage applied to V
IN
does not
exceed 50V.
HOW TO OPERATE DC2630A IN NON-I
2
C MODE
The DC2630A is easy to set up to evaluate the perfor-
mance of the LT3966 in non-I
2
C mode. Refer to Figure 1
for proper measurement equipment setup and follow the
procedure below.
1. With power off, connect a string of up to 16 LEDs
between each channel’s LED
+
and GND turrets.
Connect the EN/UVLO turret to GND to keep the cir-
cuit shut down. With the power off, connect the input
power supply to the V
IN
and GND terminals.
2. For non-I
2
C mode operation, set both JP1 and JP2
(ADDR1 and ADDR2) to 0. This address is for non-
I
2
C mode, and all other settings are for I
2
C serial
communications mode.
3. Adjust the input power supply voltage between 9V
and 18V and enable its output.
4. Release the EN/UVLO-to-GND connection.
5. Observe the LED string running at the programmed
LED current.
6. To change the brightness with analog dimming in
non-I
2
C mode, attach an adjustable voltage source
to the corresponding CTRL/PWM turrets and set
the voltage between 0V and 1.5V. See data sheet
for details.
7. To change brightness with external PWM dimming
in non-I
2
C mode, attach a rectangular waveform
with varying duty cycle to the corresponding CTRL/
PWM turrets.
HOW TO OPERATE DC2630A WITH COMMAND LINE
INTERFACE – I
2
C SERIAL COMMUNICATIONS MODE
The DC2630A works with a Linduino One microcontroller
board (DC2026C) and can be connected to a PC via USB.
This allows DC2630A to be controlled via serial port inter-
face in Arduino IDE. Refer to the DC2026C Demo Manual
for detailed instructions on installing and configuring the
necessary software libraries.
1. Launch Arduino IDE.
2. Connect Linduino to computer via USB.
3. Connect a ribbon cable between the J1 serial
communications connection and a Linduino One
demo circuit.
QUICK START PROCEDURE
PERFORMANCE SUMMARY
Specifications are at T
A
= 25°C