DC1160A Linear Technology, DC1160A Datasheet

BOARD EVAL LED DRIVER LT3518

DC1160A

Manufacturer Part Number
DC1160A
Description
BOARD EVAL LED DRIVER LT3518
Manufacturer
Linear Technology
Datasheet

Specifications of DC1160A

Current - Output / Channel
330mA
Outputs And Type
1, Non-Isolated
Voltage - Output
6.5 ~ 40V
Features
Dimmable, Shutdown
Voltage - Input
6.5 ~ 30 V
Utilized Ic / Part
LT3518
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
DESCRIPTION
Demonstration circuit 1160 is a full-featured LED driver
with 2.3A switch current featuring the LT
is optimized to drive a 330mA LED string with a total LED
voltage between the input voltage and 40V in a boost to-
pology. The high input voltage range, high effi ciency low
side internal 2.3A NPN power switch, low voltage fl oating
current sense amplifi er, soft-start, high side PMOS PWM
gate driver, high PWM dimming ratio, overvoltage protec-
tion, shutdown control pin, analog LED current dimming
control, and externally programmable switching frequency
(with sync) make the LT3518 an extremely versatile and
powerful LED driving IC.
The LT3518 has a 45V switch with 2.3A peak switch cur-
rent limit rating. DC1160 has overvoltage protection at
40V if the LEDs are open or not properly attached to the
terminals on the PCB. The shutdown function is activated
by pulling the shutdown terminal to ground. In shutdown
the boost confi guration allows the input voltage to be seen
on the output and if the attached LED array leaks current
at the input voltage, the LEDs may not completely turn off.
If the top gate is installed, it will provide shutdown output
disconnect and the LEDs will turn off during shutdown.
The CTRL terminal can be used to analog dim the LED
current. In order to use the CTRL terminal, R6 (0Ω) pull-
up short resistor must be removed and replaced with a
resistor divider from V
on the CTRL terminal.
REF
to GND or an external voltage
®
3518. The board
The high side PMOS PWM dimming MOSFET can be
used to achieve 3000:1 PWM dimming ratio. The board
is programmed for 1MHz oscillator frequency, but can
be adjusted by changing R14. Higher frequency results
in higher PWM dimming ratio.
The V
powered from an additional low voltage input such as
3.3V for higher effi ciency operation and lower on-chip
power dissipation.
A few simple modifi cations can be made to DC1160 in
order to convert the board from a boost LED driver to a
buck mode or buck-boost mode LED driver. Please consult
the data sheet for schematic details and the factory for
customization details.
The LT3518 data sheet gives a complete description of the
part, operation and applications information. The data sheet
must be read in conjunction with this Quick Start Guide for
demonstration circuit 1160. The LT3518 is assembled in a
small 16-lead plastic (4mm × 4mm) QFN UF package with
a thermally enhanced ground pad. Proper board layout is
essential for maximum thermal performance. See the data
sheet section Layout Considerations.
Design fi les for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
DEMO MANUAL DC1160
IN
pin can be tied directly to PV
LT3518: Full-Featured
LED Driver with 2.3A
Switch Current
IN
for simplicity or
dc1160f
1

Related parts for DC1160A

DC1160A Summary of contents

Page 1

... Layout Considerations. Design fi les for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. LED Driver with 2.3A ...

Page 2

... PWM DUTY CYCLE (%) Figure 1. DC1160A Effi ciency 30V LED String Turn Turn V IN rent, the circuit effi ciency, etc. without looking directly at the LEDs. 7. For PWM dimming, tie a 100Hz PWM waveform + to the PWM terminal and GND and observe the PWM dimming LED current and PWM gate waveforms. ...

Page 3

QUICK START PROCEDURE 6.5V TO 30V – PVIN – – VIN + – 3.3V DEMO MANUAL DC1160 V LED – OPTIONAL Figure 3. ...

Page 4

DEMO MANUAL DC1160 PARTS LIST ITEM QUANTITY REFERENCE C3, VIN PVIN OUT R12 ...

Page 5

SCHEMATIC DIAGRAM 14 15 DEMO MANUAL DC1160 ISN SYNC 7 ISP GND 17 VIN dc1160f 5 ...

Page 6

DEMO MANUAL DC1160 ASSEMBLY DRAWINGS Silkscreen Top 6 dc1160f ...

Page 7

PCB LAYOUT AND FILM DEMO MANUAL DC1160 Silkscreen Top Component Side dc1160f 7 ...

Page 8

DEMO MANUAL DC1160 PCB LAYOUT AND FILM 8 Inner Layer 2 Inner Layer 3 dc1160f ...

Page 9

PCB LAYOUT AND FILM DEMO MANUAL DC1160 Soldermask Top Pastemask Top dc1160f 9 ...

Page 10

DEMO MANUAL DC1160 PCB LAYOUT AND FILM Soldermask Bottom 10 Pastemask Bottom Solder Side dc1160f ...

Page 11

... FABRICATION DRAWING . . . Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. DEMO MANUAL DC1160 dc1160f 11 ...

Page 12

... Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods ...

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