DC1511A-A Linear Technology, DC1511A-A Datasheet - Page 2

• Manufacturer Part Number: DC1511A-A
• Description: µModule LED Driver Eval. Board
• Manufacturer: Linear Technology

Specifications of DC1511A-A

• Core Chip: LTM8042
• Topology: Buck-Boost
• Output Current: 1A
• Output Voltage: 36V
• No. Of Outputs: 1
• Dimming Control Type: PWM / Analog
• Kit Contents: Board, User Guide

DEMO MANUAL DC1511A
QUICK START PROCEDURE
Demonstration circuit 1511A is easy to set up to evaluate
the performance of the LTM8042EV/LTM8042EV-1. Refer
to Figure 1 for the proper measurement equipment set-
up and follow the procedure below for a boost (step-up)
topology.
1. Connect a string of LEDs with forward voltage 32V or
2. With the power off, connect the input power supply
Table 1. Input Range for Proper Operation (Refer to the
LTM8042/LTM8042-1 Datasheet)
3. Connect the PWM terminal. If PWM is not used, con-
4. Turn the input power supply on.
5. Observe the LED string running at the programmed
6. For PWM dimming, connect a PWM 100Hz or higher
7. Observe the reduction of brightness in the LED string
2
INPUT VOLTAGE
(BSTIN/BKLED
11.3V to 13.8V
13.4V to 16.5V
20.5V to 22.5V
8.6V to 11.3V
6.4V to 7.7V
5V to 5.8V
TO GND)
less, but greater than the input voltage, to the LED
(LED anode) and GND (LED cathode) terminals on the
PCB, as shown in Figure 1.
to the BSTIN/BKLED
ranges specified in Table 1. Preset the DC input volt-
age within the recommended input voltage range for
the appropriate forward voltage of the LED string.
nect PWM to a 5V source or to the input voltage. PWM
must be pulled high or the LEDs will remain off.
LED current.
frequency signal to the PWM terminal.
by varying the duty cycle of the PWM signal.
DC1511A-A LTM8042
–
(LED
LED STRING
12V to 16V
15V to 21V
18V to 24V
24V to 32V
8V to 12V
VOLTAGE
6V to 9V
+
TO GND)
–
and GND terminals within the
INPUT VOLTAGE
(BSTIN/BKLED
4.8V to 12.3V
8.5V to 20.8V
4.1V to 10V
5.8V to 15V
3.2V to 7V
TO GND)
DC1511A-B LTM8042-1
–
(LED
LED STRING
12V to 16V
15V to 21V
18V to 24V
24V to 32V
8V to 12V
VOLTAGE
+
TO GND)
+
the following modifications to the procedure.
1. At step 1, connect the cathode of the LED string to
2. At step 2, refer to the datasheet buck-boost mode
To use the DC1511A in a buck mode (step-down) topology,
make the following modifications to the procedure.
1. Remove the 0Ω jumper at location R8 and instead
2. At step 1, connect the cathode of the LED string to
3. At step 2, connect the input power supply to BSTOUT/
To use the DC1511A in a buck-boost mode topology, make
the BSTIN/BKLED
may be greater than the input voltage for buck-boost
mode.
applications information table. Preset the DC input
voltage within the recommended input voltage range
for the appropriate forward voltage and current of the
LED string.
install the jumper at location R4. This shorts the V
TGEN and RUN pins/terminals to BSTOUT/BKIN
instead of BSTIN/BKLED
the BSTIN/BKLED
must be less than the input voltage for buck mode.
BKIN and GND. Refer to the datasheet buck mode
applications information table. Preset the DC input
voltage within the recommended input voltage range
for the appropriate forward voltage and current of the
LED string.
–
–
terminal. The LED forward voltage
terminal. The LED forward voltage
–
.
dc1511af
CC
,