Linear Technology DC1160 Guida rapida alla configurazione

dc1160f

DEMO MANUAL DC1160

DESCRIPTION

LT3518: Full-Featured

LED Driver with 2.3A

Switch Current

Demonstration circuit 1160 is a full-featured LED driver

with 2.3A switch current featuring the LT

3518. The board

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 efﬁciency low

side internal 2.3A NPN power switch, low voltage ﬂoating

current sense ampliﬁer, soft-start, high side PMOS PWM

gate driver, high PWM dimming ratio, overvoltage protec-

tion, shutdown control pin, analog LED current dimming

control,andexternallyprogrammableswitchingfrequency

(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 conﬁguration 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 VREF to GND or an external voltage

on the CTRL terminal.

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.

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 VIN pin can be tied directly to PVIN for simplicity or

powered from an additional low voltage input such as

3.3V for higher efﬁciency operation and lower on-chip

power dissipation.

A few simple modiﬁcations 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 andapplicationsinformation. The datasheet

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 ﬁles for this circuit board are available at

http://www.linear.com/demo

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dc1160f

DEMO MANUAL DC1160

QUICK START PROCEDURE

DC1160 is easy to set up to evaluate the performance of

the LT3518. Follow the procedure below:

Note:Makesurethat the PVIN inputvoltagedoesnotexceed

40V and that the VIN input voltage does not exceed 30V.

1. Connect a string of LEDs with forward voltage less than

40V, but greater than the PVIN input voltage, to the LED+

and GND terminals on the PCB as shown.

2. With power off, connect a 3.3V input power supply to

the VIN and GND terminals on the PCB.

3. With power off, connect a 3V to 40V input power supply

to PVIN and GND terminals on the PCB. PVIN should

not exceed the attached LED string voltage.

4. Connect a 3.3V source to PWM and GND.

5. Turn PVIN power on.

6. Turn VIN power on and observe the regulated LED cur-

rent, the circuit efﬁciency, etc. without looking directly

at the LEDs.

7. For PWM dimming, tie a 100Hz,3V to 5V PWM waveform

to the PWM terminal and GND and observe the PWM

dimming LED current and PWM gate waveforms.

8. For shutdown, tie the SHDN terminal to GND and

observe the LED current dropping to zero and the VIN

input current dropping to about 65mA with R4 installed

(VIN/51k).

PWM DUTY CYCLE (%)

EFFICIENCY (%)

100

DC1160 F01

20 20 40 60 100

VIN = 12V

CTRL = VREF

Figure 1. DC1160A Efﬁciency 30V LED String, PVIN = VIN = 12V

PWM

5V/DIV

ILED

200mA/DIV

IL1

1A/DIV

1μs/DIV DC1160 F02

Figure 2. 3000:1 PWM Dimming at 100Hz,

PVIN = 12V, VLED = 30V

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dc1160f

DEMO MANUAL DC1160

QUICK START PROCEDURE

Figure 3. Proper Measurement Equipment Setup

3.3V OR

PWM

OPTIONAL

DC1160 F03

VIN

PVIN

6.5V TO 30V

3.3V

IPVIN

IVIN

VLED

ILED

330mA LED ARRAY

–

+–

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dc1160f

DEMO MANUAL DC1160

PARTS LIST

ITEM QUANTITY REFERENCE PART DESCRIPTION MANUFACTURER, PART NUMBER

REQUIRED CIRCUIT COMPONENTS:

1 1 C5 Capacitor, X7R, 4.7nF, 25V, 20% 0402 AVX, 04023C472MAT2A

2 2 C3,C4 Capacitor, X7R, 0.01μF, 16V, 10% 0402 AVX, 0402YC103KAT

31 C

VIN Capacitor, X7R, 1μF, 50V, 10% 1206 Murata, GRM31MR71H105KA88L

42C

PVIN, COUT Capacitor, X5R, 2.2μF, 50V, 10% 1206 Murata, GRM31CR71H225KA88L

5 1 D1 Schottky Rectiﬁer, 2.1A\60V, SMA Vishay, 10MQ060NPBF

6 1 L1 Inductor, 10μH Sumida, CDRH8D28-100NC

7 1 R1 Resistor, Chip, 0.300Ω, 1/4W, 1% 1206 Vishay, CRCW1206R300FNTA

8 1 R8 Resistor, Chip, 392k, 1/16W, 1% 0402 Vishay, CRCW0402392KFKED

9 1 R12 Resistor, Chip, 10k, 1/16W, 1% 0402 Vishay, CRCW040210K0FKED

10 1 R13 Resistor, Chip, 5.1k, 1/16W, 1% 0402 Vishay, CRCW04025K10FKEA

11 1 R14 Resistor, Chip, 16.5k, 1/16W, 1% 0402 Vishay, CRCW040216K5FKEA

12 1 U1 I.C., LT3518EUF Linear Tech., LT3518EUF#PBF

ADDITIONAL DEMO BOARD CIRCUIT COMPONENTS:

1 0 C1,C2,C6 OPT

2 1 Q1 MOSFET, P-Channel 40-V (D-S) SOT23 Vishay, Si2319DS-T1-E3

3 2 R6, R7 Resistor, Chip, 0, 0402 Vishay, CRCW04020000Z0ED

4 1 R4 Resistor, Chip, 51k, 1/16W, 5% 0402 AAC, CR05-513JM

5 0 R2, R3, R5,

R9-R11, R15, R16

OPT

HARDWARE FOR DEMO BOARD ONLY:

1 12 E1 to E12 Testpoint, Turret, 0.094" Mill-Max, 2501-2

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dc1160f

DEMO MANUAL DC1160

SCHEMATIC DIAGRAM

4 4

3 3

1 1

1206

Linear Technology Has Made A Best Effort To Design A

CIN Boost

1206

CircuitT

hat Meets Customer-Supplied Specifications;

However,ItRemains The Customer's Responsibility To

40V Transients

VerifyProper And ReliableOperation In The Actual

Application. Component Substitution And Printed

Circuit Board LayoutMay Significantly Affect Circuit

Performance Or Reliability. Contact Linear Technology

Applications Engineering For Assistance.

ThisCircui

sProprietaryToLin

ear Technology And

Supplied ForUse With Linear Technology Parts.

Customer Notice

LTCCONFIDENTIAL - FOR CUSTOMER USEONL

Demo Circuit 1160A LT3518EUF

Full-Featured LED Driver with 2.3A Switch Current

LINEAR TECHNOLOGY CORPORATION

1630McCAR

THY BLVD.

MILPITAS, CA. 95035

PHONE (408) 432-1900 FAX (408) 434-0507

Wednesday,J

uly 18, 2007

Title

Size Document Number Rev

Date: Sheet of

PVIN

OUT

VIN

LED+

OUT

PVIN

OUT

PVIN

Opt.

LED+

330mA

Si2319DS

R16

Opt.

10MQ060N

2 1

E10

GND

392k

0.300

1206

CVIN

1uF

50V

CTRL

GND

SYNC

51k

OUT

PVIN

3V-40V

Opt.

2.2uF

Opt.

4.7nF

COUT

2.2uF

50V

E12

GND

Opt.

R10

Opt.

PWM

VIN

3V-30V

E11

GND

R12

10k

R14

16.5k

1MHz

CPVIN

2.2uF

50V

Opt.

0.01uF

Opt.

LT3518EUF

VIN

SHDN

SYNC

VREF

PWM

CTRL

TGEN

ISN

ISP

GND

R13

5.1k

Opt.

SHDN

10uH

R15

Opt.

0.01uF

R11

Opt.

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dc1160f

DEMO MANUAL DC1160

ASSEMBLY DRAWINGS

Silkscreen Top

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dc1160f

DEMO MANUAL DC1160

PCB LAYOUT AND FILM

Silkscreen Top

Component Side

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dc1160f

DEMO MANUAL DC1160

PCB LAYOUT AND FILM

Inner Layer 2

Inner Layer 3

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dc1160f

DEMO MANUAL DC1160

PCB LAYOUT AND FILM

Soldermask Top

Pastemask Top

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dc1160f

DEMO MANUAL DC1160

Pastemask Bottom

Solder Side

PCB LAYOUT AND FILM

Soldermask Bottom

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