Linear Technology LT8391EFE Quick setup guide

dc2345af

DEMO MANUAL DC2345A

DESCRIPTION

LT8391EFE

60V Synchronous 4-Switch

Buck-Boost Led Controller with Spread Spectrum

Demonstration circuit 2345A is a 60V synchronous

4-switch buck-boost LED controller with spread spectrum

featuringtheLT

8391LED driver. It accepts aninputvoltage

from 4V to 60V and drives a single string of LEDs up to

25V at 2A. DC2345A runs at 400kHz switching frequency

without spread spectrum, but spread spectrum frequency

modulation (SSFM) can be enabled with a simple jumper.

SSFM spreads the switching frequency to fsw ±15% for

reduced EMI.

The LT8391 has a wide input voltage range down to 4V and

up to 60V. It has adjustable switching frequency between

150kHz and 600kHz. There is a simple jumper option for

external frequency synchronization, spread spectrum

frequency modulation, or neither.

The LT8391 can be PWM dimmed with an external PWM

signal and an internally-generated PWM signal. DC2345A

has a jumper that can e set to switch between internally-

generated PWM signal, externally-generated PWM signal,

and no PWM signal (100% on). It can be analog dimmed

with a control voltage on either of its two control pins.

LT8391 features both open LED and short LED (LED+ to

GND) protection as well as a fault output flag.

When run with both PWM dimming and spread spectrum,

the spread spectrum aligns itself with the PWM signal for

flicker-free operation.

Small ceramic input and output capacitors are used to save

space and cost. The board is designed with capacitors on

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.

both sides of the synchronous switches for a reduction

in radiated EMI. The open LED overvoltage protection

uses the IC’s constant voltage regulation loop to regulate

the output to approximately 29.7V if the LED string is

opened although it may reach 32V peak during transient

from running LEDs to open. There is a protection diode

from LED+ to GND to prevent negative ringing during a

short-circuit with long wires.

Undervoltage lockout can be adjusted on the circuit with

a few simple resistor choices.

There is an EMI filter on the input of DC2345A. This filter

has a 3.2µH inductor and two 4.7µF capacitors. It is ef-

fective in reducing the conducted EMI in the AM band to

pass CISPR25 class 5 regulations. When run with SSFM,

DC2345A has low conducted EMI.

The LT8391 data sheet gives a complete description of

the part, operation and applications information. The data

sheet must be read in conjunction with this Demo Manual

for demonstration circuit DC2345A. The LT8391EFE is

assembled in a 28-lead plastic TSSOP (FE) 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/DC2345A

dc2345af

DEMO MANUAL DC2345A

QUICK START PROCEDURE

Demonstrationcircuit DC2345A is easy to set upto evaluate

theperformanceof the LT8391 Follow the procedurebelow:

1. With power off, connect a string of LEDs that will run

with forward voltage less than or equal to 25V(at 2A)

to the LED+ and GND banana jacks on the PCB as

shown in Figure 1.

2. Connect the EN/UVLO terminal to GND.

3. Set JP1 to EXT/ON and JP3 to ON for 100% always-on

LED operation. Set JP2 to NO SPREAD/SYNC to run

without SSFM or external synchronization.

4. With power off, connect the input power supply to the

EMIVIN and GND banana jacks. Make sure that the DC

input voltage will not exceed 60V.

5. Turn the input power supply on and make sure the

voltage is between 4V and 60V for proper operation.

6. Release the EN/UVLO-to-GND connection.

7. Observe the LED string running at the programmed

LED current.

8. To change the brightness with analog dimming, simply

attach a voltage source to either the CTRL1 or CTRL2

terminal and set the voltage between 0V and 1.5V. See

data sheet for details.

9. To change brightness with external PWM dimming, set

JP1 to EXT/ON and JP3 to EXT. Attach a 3V rectangular

waveform with varying duty cycle to the PWM terminal.

10. To change brightness with internally-generated PWM

dimming, set JP1 to INT and JP3 to INT. Adjust the

setting of the VR1 variable resistor with a small ﬂat-

head screwdriver to toggle between 0% and 100%

PWM dimming duty cycle in 1/128 steps.

11. To enable spread spectrum frequency modulation, set

JP2 to SPREAD ON.

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX

Input Voltage EMIVIN Range Operating VLED = 25V 4V 60V

Switching Frequency R3 = 100k 400kHz

ILED R1 = 0.05Ω 7.0V < PVIN < 60V VLED = 25V 2.0A

VLED range R5 = 1M R6 = 34.8k 26V

Open LED Voltage VOUT R5 = 1M R6 = 34.8k 29.7V

Typical Efficiency (100% PWM DC) PVIN = 14V VLED = 25V ILED = 2.0A 97%

Internally-Generated PWM Dimming Range Operating JP3 = INT JP1 = INT 1/128 100%

Internally-Generated PWM Dimming Frequency Operating JP3 = INT JP1 = INT R16 = 200k 200Hz

Peak Switch Current Limit Boost Region R2 = 0.004Ω 12.5A

Peak Switch Current Limit Buck Region R2 = 0.004Ω 12.5A

dc2345af

DEMO MANUAL DC2345A

QUICK START PROCEDURE

Figure 1. Test Procedure Setup Drawing for DC2345A

SET JP2 FOR SPREAD SPECTRUM

OR EXTERNAL SYNCHRONIZATION

OPTIONAL EXTERNAL

FREQUENCY SYNC

DC2345A F01

OPTIONAL CTRL2

ANALOG DIMMING

FLOAT OKAY

OPTIONAL

CTRL1 ANALOG

DIMMING FLOAT

OKAY

OPTIONAL CONNECT TO

GND FOR SHUTDOWN

FLOAT = ENABLE

SET JP3 FOR PWM DIMMING TYPE

ON = 100% ON WITH NO PWM DIM

INT = INTERNAL PWM DIMMING SET WITH JP1

AND VR1

EXT = EXTERNAL PWM DIMMING SET WITH JP1

AND PWM INPUT

NOTE: SET JP1 TO MATCH JP3

OPTIONAL

PWM INPUT

FOR EXTERNAL

PWM DIMMING

+–

IIN

+–

ILED

VIN

–

VOUT

–

dc2345af

DEMO MANUAL DC2345A

ILED (A)

EFFICIENCY (%)

VIN (V)

600

100

10 20 30 40 50

0.5

1.5

2.5

EFFICIENCY

BOOST BUCK

BUCK-BOOST

VLED = 25V

ILED = 2A

fSW = 400kHz

ILED

5µs/DIV

IL1

1A/DIV

ILED

1A/DIV

INFINITE PERSIST

VIN = 24V

VLED = 25V

SPREAD SPECTRUM ON

1000:1 DIMMING: EXTERNAL PWM SOURCE, 120Hz

10µs/DIV

IL1

1A/DIV

ILED

1A/DIV

INFINITE PERSIST

VIN = 24V

VLED = 25V

SPREAD SPECTRUM ON

128:1 DIMMING: INTERNAL PWM DIMMING, 200Hz

QUICK START PROCEDURE

Figure 2. DC2345A Efficiency and LED Current Versus Input Voltage for 25V 2A LED Load.

Efficiency Peaks at 98% and Doesn’t Stray Far from That Peak, Ranging from 95% to 97%

Throughout the Typical 9V-16V Automotive Input Range. Also Shown, the LT8391 Peak

Inductor Current Limit Can Maintain Stable Output with Reduced Output Power at Low VIN.

Figure 3. Infinite-Persist Scope Traces Show PWM Dimming and SSFM Working Together for

Flicker-Free Brightness Control with Both Externally and Internally Generated PWM Dimming.

dc2345af

DEMO MANUAL DC2345A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C1, C2 CAP., CER., 4.7µF, X7S, 100V, 10%, 1206 AVX, 12061Z475KAT2A

2 2 C3, C4 CAP., CER., 10µF, X5R, 50V, 10%, 1206 MURATA, GRM31CR61H106KA12L

3 1 C5 CAP., CER., 1µF, X5R, 50V, 10%, 0603 MURATA, GRM188R61H105KAALD

4 1 C6 CAP., CER., 1µF, X7S, 100V, 10%, 0805 TDK, C2012X7S2A105K125AB

5 1 C7 CAP., CER., 0.47µF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C474KA88D

6 3 C8, C11, C12 CAP., CER., 0.1µF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C104KA01D

7 2 C9, C17 CAP., CER., 10nF, X7R, 16V, 10%, 0603 AVX, 0603YC103KAT2A

8 1 C10 CAP., CER., 4.7µF, X5R, 10V, 10%, 0603 MURATA, GRM188R61A475KE15D

9 1 L1 IND., 4.7µH, 13.00 ×12.80mm WURTH ELEKTRONIK, 7443550480

10 1 M1 MOSFET, 60V, TDSON-8 INFINEON, BSC067N06LS3

11 1 M2 MOSFET, 60V, TDSON-8 INFINEON, BSC100N06LS3

12 2 M3, M4 MOSFET, 40V, TDSON-8 INFINEON, BSC093N04LS

13 1 M5 MOSFET, P-CH, 40V, POWERPAK-1212-8 VISHAY, SI7611DN-T1-GE3

14 1 R1 RES,. SENSE, 0.05Ω, 1W, 1%, 2010 TT Electronics, LRC-LR2010LF-01-R050F

15 1 R2 RES,. SENSE, 0.004Ω, 1W, 1%, 2010 ROHM, PMR50HZPFV4L00

16 1 R3 RES, CHIP, 100k, 1/10W, 5%, 0603 VISHAY, CRCW0603100K0JNEA

17 1 R4 RES, CHIP, 2.2k, 1/10W, 1%, 0603 VISHAY, CRCW06032K20FKEA

18 1 R5 RES, CHIP, 1M, 1/10W, 1%, 0603 VISHAY, CRCW06031M00FKEA

19 1 R6 RES, CHIP, 34.8k, 1/10W, 1%, 0603 VISHAY, CRCW060334K8FKEA

20 1 R9 RES, CHIP, 5.1, 1/10W, 5%, 0603 VISHAY, CRCW06035R10JNEA

21 1 R26, R27 RES, CHIP, 10Ω, 1/10W, 5% 0603 VISHAY, CRCW060310R0FKEA

22 1 U1 I.C., LED CONTROLLER, TSSOP28FE-EA LINEAR TECH., LT8391EFE#PBF

Optional Electrical Components

1 1 C13 CAP., ALUM., 33µF, 63V, 20%, 8 × 10.2mm SUN ELECTRONIC INDUSTRIES CORPORATION,

63CE33BS

2 2 C14, C15 CAP., CER., 4.7µF, X7S, 100V, 10%, 1206 AVX, 12061Z475KAT2A

3 1 C16 CAP., CER., 0.1µF, X5R, 100V, 10%, 0402 MURATA, GRM155R62A104KE14D

4 0 C18, C19, C20, C21 (OPT) CAP., OPTION, 0603

5 1 D1 DIODE, SCHOTTKY, 60V, 1A, SOD323F NXP, PMEG6010CEJ,115

6 0 D2 (OPT) DIODE, ZENER, 5.1V, 250MW, SOD323 CENTRAL SEMI., CMDZ5231B TR

7 0 FB1 (OPT) CHIP BEAD, OPTION, 1206

8 1 L2 IND., 3.2µH, 13.00 × 12.80mm WURTH ELEKTRONIK, 7443550320

9 3 R10, R11, R15 RES, CHIP, 100k, 1/10W, 5%, 0603 VISHAY, CRCW0603100K0JNEA

10 1 R7 RES, CHIP, 499k, 1/10W, 1%, 0603 VISHAY, CRCW0603499KFKEA

11 1 R8 RES, CHIP, 221k, 1/10W, 1%, 0603 VISHAY, CRCW0603221KFKEA

12 0 R12, R13, R14, R17, R18,

R19, R20, R23 (OPT)

RES., OPTION, 0603

13 1 R16 RES, CHIP, 200k, 1/10W, 1%, 0603 VISHAY, CRCW0603200KFKEA

14 3 R21, R24, R25 RES, CHIP, 0Ω, 1/10W, 1%, 0603 VISHAY, CRCW06030000Z0EA

15 1 R22 RES, CHIP, 91k, 1/10W, 5%, 0603 VISHAY, CRCW060391K0FKEA

16 1 VR1 TRIMMER., 100k, 0.25W, SMD Bourns, 3314J-1-104E

dc2345af

DEMO MANUAL DC2345A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Additional Hardware

1 4 E1, E2, E10, E11 TEST POINT, TURRET, .094" MTH HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

2 9 E3, E4, E5, E6, E7, E8, E9,

E12, E13

TEST POINT, TURRET, .061" MTG. HOLE MILL-MAX, 2308-2-00-80-00-00-07-0

3 1 JP1 CONN., HEADER, 1 × 3, 2mm WURTH ELEKTRONIK, 62000311121

4 2 JP2, JP3 CONN., HEADER, 2 × 3, 2mm WURTH ELEKTRONIK, 62000621121

5 3 XJP1, XJP2, XJP3 SHUNT, 2mm WURTH ELEKTRONIK, 60800213421

6 4 J1, J2, J3, J4 CONN., JACK, BANANA, Non-Insulated, 0.218" KEYSTONE, 575-4

dc2345af

DEMO MANUAL DC2345A

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 representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

SCHEMATIC DIAGRAM

dc2345af

DEMO MANUAL DC2345A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

LT 0516 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

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. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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Largest Supplier of Electrical and Electronic Components

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