Quick Start Procedure - Linear Technology DC1576 Demo Manual

DEMO MANUAL DC1573A

qUick stArt proceDUre

Demonstration circuit 1573A is easy to set up to evaluate
the performance of the LT3760. Follow the procedure below:
Note: PWM must be pulled high to work. If PWM is not
used, tie PWM high or connect to REF on the PCB using
resistor R9.
1. Connect strings of LEDs with forward voltage less than
45V, but greater than the PV
LED1-8 terminals on the PCB as shown in Figure 1. Tie
any unused LED1-8 pins directly to V
power-up to disable that channel.
2. Connect the SHDN terminal to GND.
3. With power off, connect the PV
PV and GND terminals within the range specified on
IN
the PCB. Make sure that the PV
not exceed the forward voltage of the LED string.
2
voltage, to the LED+ and
IN
(LED+) before
OUT
power supply to the
IN
DC input voltage does
IN
Figure 1. Proper Measurement Setup Drawing
4. With power off, connect the V
V and GND terminals within the range specified on
IN
the PCB.
5. Connect the PWM terminal. If PWM is not used, tie PWM
high or connect to REF on the PCB using resistor R9.
PWM must be pulled high to work.
6. Turn the PV power supply on.
IN
7. Turn the V power supply on after PV
IN
8. Release the SHDN-to-GND connection.
9. Observe the LED strings running at the programmed
LED current.
Note: For PWM dimming, connect a PWM (100Hz or higher)
signal to the PWM terminal and observe the reduction of
brightness in the LED string when PWM dimming.
power supply to the
IN
.
IN
dc1573af