Analog Devices EVAL-LT8376-AZ Guide de configuration rapide

DEMO MANUAL EVAL-LT8376-AZ

Rev. 0

DESCRIPTION

LT8376

60V, 2A Silent Switcher

Synchronous Step-Down LED Driver

Evaluation board EVAL-LT8376-AZ is a 60V, 2A syn-

chronous Buck LED driver featuring the LT

8376. EVAL-

LT8376-AZ drives a single string of LEDs up to 36V at

1.5A when V

is between 43V and 57V. EVAL-LT8376-AZ

has an undervoltage lockout (UVLO) set at 40V with 2V

hysteresis for turn-on. EVAL-LT8376-AZ runs at 350kHz

switching frequency and features optional spread spec-

trum modulation (SSFM). With SSFM enabled, LT8376

modulates its switching frequency from fSW to fSW + 25%

to reduce EMI emissions.

The LT8376 has an input voltage range of 3.6V to 60V.

LT8376 has internal, synchronous 60V switches for

high efficiency and small size. LT8376 has an adjustable

switching frequency between 200kHz and 2MHz. The

LT8376 can be synchronized with an external clock source

or configured with SSFM enabled for low EMI. EVAL-

LT8376-AZ includes a SYNC/SSFM jumper to configure

the LT8376 for either external frequency synchronization,

SSFM enabled for low EMI, or set to normal operation

with SSFM disabled.

The LT8376’s integrated PWMTG high-side PMOS driver

assists with PWM dimming of the connected LEDs. The

LED string can be PWM dimmed for accurate brightness

control with an externally generated PWM signal or an

internally-generated PWM signal. EVAL-LT8376-AZ has

jumpers that can be set to switch between internally-gen-

erated PWM signal, externally generated PWM signal, and

100% on with no PWM signal. The LT8376 can also be

analog dimmed by placing a controllable DC voltage on

the CTRL pin. When running PWM dimming with SSFM

enabled, the SSFM aligns itself with the PWM signal for

flicker-free operation of the LED string. This applies to

both internal and external PWM dimming.

All registered trademarks and trademarks are the property of their respective owners.

Small ceramic input and output capacitors are used to

save space and cost. The input and output filters on

EVAL-LT8376-AZ reduce its EMI. The filters consist of a

small ferrite bead or inductor and high frequency ceramic

capacitors. These filters, combined with proper board

layout and SSFM, are very effective in reducing EMI to

comply with CISPR25 class 5 limits. Please follow the

recommended layout and the four-layer PCB thickness of

EVAL-LT8376-AZ. For best efficiency and PWM dimming

performance, the EMI filters at the input and output can

be removed.

The open LED overvoltage protection (OVP) uses the IC’s

constant voltage regulation loop to regulate the output to

approximately 41V if the LED string is opened. The output

current can be monitored through the ISMON pin. Also,

the FAULT pin can be used for open and short detection.

The input undervoltage lockout (UVLO), LED current,

output overvoltage protection (OVP), and switching fre-

quency, can all be easy adjusted with simple modifications

to EVAL-LT8376-AZ.

The LT8376 data sheet gives a complete description of the

device, operation, and applications information. The data

sheet must be read in conjunction with this demo manual

for evaluation board EVAL-LT8376-AZ. The LT8376RV

is assembled in a 28-lead plastic LQFN package with a

thermally enhanced exposed ground pad. Proper board

layout is essential for maximum performance. See the

data sheet section “Designing the Printed Circuit Board”.

Design files for this circuit board are available.

DEMO MANUAL EVAL-LT8376-AZ

Rev. 0

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

PARAMETER CONDITION MIN TYP MAX UNITS

Input Voltage EMIVIN Range Operating 43 57 V

Switching Frequency (fSW) R5 = 287k, JP2 = NO SSFM 350 kHz

Spread Spectrum (SSFM) Range R5 = 287k, JP2 = SSFM 350 440 kHz

ILED R1 = 0.05Ω, R8, R15 = 100k,

43V < VIN < 57V, VLED = 36V

1.5 A

Open LED Voltage VOUT (OVP) R7 = 1M, R6 = 24.9k 41 V

Typical Efficiency VIN = 50V, VLED = 36V, ILED = 1.5A

with Filters

without Filters

96.5

Internally-Generated PWM Dimming Range JP3 = INT, JP4 = INT 1/128 100 %

Internally-Generated PWM Dimming Frequency JP3 = INT, JP4 = INT

R12 = 118k, R5 = 287k

192 Hz

Peak Current Limit 3.3 3.6 3.9 A

EMIVIN Undervoltage Lockout (UVLO) Falling R3 = 402k, R2 = 12.7k 39.8 V

EMIVIN Enable Turn-On (EN) Rising R3 = 402k, R2 = 12.7k 42.3 V

BOARD PHOTO

DEMO MANUAL EVAL-LT8376-AZ

Rev. 0

PROGRAMMING LED CURRENT VIA CTRL PIN

The LT8376 uses the voltage across the current sense

resistor R1, and the voltage at the CTRL pin to program

the LED current. The maximum current sense resistor

voltage that can be programmed on the LT8376 is 100mV.

When VCTRL falls below 250mV, the LED current will be

0A and when VCTRL is above 1.25, the LED current will

be the maximum set by the current sense resistor. EVAL-

LT8376-AZ uses a 50mΩcurrent sense resistor, and a

voltage divider on the CTRL pin to regulate the LED cur-

rent to 1.5A. R8 and R15 set the voltage divider from

VREF pin to the CTRL pin. EVAL-LT8376-AZ will produce

a maximum LED current of 2A when VCTRL > 1.25V. The

LED current can be analog dimmed to another current

level by adjusting R8 and R15. Please refer to the data

sheet for more details.

QUICK START PROCEDURE

Evaluation board EVAL-LT8376-AZ is easy to set up to

evaluate the performance of the LT8376. Follow the pro-

cedure below:

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

with forward voltage less than or equal to 36V (at 1.5A)

to the LED+ and LED–turrets on the PCB as shown in

Figure1.

2. Set JP4 to EXT/ON and JP3 to ON for 100% always

on LED operation. Set JP2 to NO SSFM to run without

SSFM.

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

EMIVIN and GND turrets. Make sure that the DC input

voltage will not exceed 60V.

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

voltage is between 43V and 57V for proper operation

at max LED current.

5. Observe the LED string running at the programmed

LED current.

6. To change the brightness with analog dimming, simply

attach a voltage source to the CTRL test point and set

the voltage between 0.25V and 1.25V. See data sheet

for details.

7. To change the brightness with external PWM dimming,

set JP4 to EXT/ON and JP3 to EXT. Attach a 1.5V rect-

angular waveform with varying duty cycle to the PWM

terminal.

8. To change the brightness with internally-generated

PWM dimming, set JP4 to INT and JP3 to INT. Adjust

the setting of the V

variable resistor with a small

flathead screwdriver to toggle between 0% and 100%

PWM dimming duty cycle in 1/128 steps.

9. To enable spread spectrum frequency modulation, set

JP2 to SSFM.

DEMO MANUAL EVAL-LT8376-AZ

Rev. 0

Figure1. Setup Drawing for EVAL-LT8376-AZ

QUICK START PROCEDURE

DEMO MANUAL EVAL-LT8376-AZ

Rev. 0

Efficiency vs VIN

EVAL-8376 F02

= 350kHz

SSFM = ON

LED

= 1.5A

LED

= 36V

WITH EMI FILTERS

WITHOUT EMI FILTERS

INPUT VOLTAGE (V)

100

EFFICIENCY (%)

Figure2. EVAL-LT8376-AZ Efficiency vs VIN

Internal PWM Dimming

128:1 PWM RATIO, 192Hz PWM FREQUENCY

10µs/DIV

50V/DIV

PWMTG

20V/DIV

2A/DIV

LED

2A/DIV

EVAL-8376 F03

Figure3. EVAL-LT8376-AZ Internal PWM

Dimming with EMI Filters: 48VIN, 36VLED, 1.5A

Transient Response

500µs/DIV

LED

500mA/DIV

CTRL

500mV/DIV

EVAL-8376 F04

Figure4. EVAL-LT8376-AZ: 50% to 100% to 50%

Load Step Transient Response, 48VIN

TEST RESULTS

Figure5. EVAL-LT8376-AZ Board Thermal Image: 48VIN, 36VLED, 1.5A (SSFM ON)

DEMO MANUAL EVAL-LT8376-AZ

Rev. 0

Figure6. EVAL-LT8376-AZ Conducted Emissions (Voltage Method): 48VIN, 36VLED, 1.5A (SSFM ON)

TEST RESULTS

Figure7. EVAL-LT8376-AZ Conducted Emissions (Current Method): 48VIN, 36VLED, 1.5A (SSFM ON)

Figure8. EVAL-LT8376-AZ Radiated Emissions: 48VIN, 36VLED, 1.5A (SSFM ON)

CLASS 5 PEAK LIMIT

EVAL-LT8376-AZ

AMBIENT

FREQUENCY (MHz)

0.1

108

–20

–10

PEAK CE (dBµV)

EVAL-8376 F06a

(a) CISPR25 Peak Conducted EMI – Voltage Method

CLASS 5 AVERAGE LIMIT

EVAL-LT8376-AZ

AMBIENT

FREQUENCY (MHz)

0.1

108

–20

–10

AVERAGE CE (dBµV)

EVAL-8376 F06b

(b) CISPR25 Average Conducted EMI – Voltage Method

CLASS 5 PEAK LIMIT

EVAL-LT8376-AZ

AMBIENT

FREQUENCY (MHz)

0.1

100

300

–60

–50

–40

–30

–20

–10

PEAK CE (dBµA)

EVAL-8376 F07a

(a) CISPR25 Peak Conducted EMI – Current Method

CLASS 5 AVERAGE LIMIT

EVAL-LT8376-AZ

AMBIENT

FREQUENCY (MHz)

0.1

100

300

–60

–50

–40

–30

–20

–10

AVERAGE CE (dBµA)

EVAL-8376 F07b

(b) CISPR25 Average Conducted EMI – Current Method

CLASS 5 PEAK LIMIT

EVAL-LT8376-AZ

AMBIENT

FREQUENCY (MHz)

0.1

100

1000

–20

–10

PEAK RE (dBµV/m)

EVAL-8376 F08a

(a) CISPR25 Peak Radiated EMI

CLASS 5 AVERAGE LIMIT

EVAL-LT8376-AZ

AMBIENT

FREQUENCY (MHz)

0.1

100

1000

–20

–10

AVERAGE RE (dBµV/m)

EVAL-8376 F08b

(b) CISPR25 Average Radiated EMI

DEMO MANUAL EVAL-LT8376-AZ

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., 10μF, X7R, 50V, 10%, 1206 SAMSUNG, CL31B106KBHNNNE

2 2 C2, C3 CAP., 4.7μF, X7S, 100V, 10%, 1210 SAMSUNG, CL32Y475KCVZW6E

3 3 C4-C6 CAP., 0.47μF, X7R, 100V, 10%, 0805 AVX, 08051C474KAZ2A

4 1 C7 CAP., 2.2μF, X7R, 10V, 10%, 0603 MURATA, GRM188R71A225KE15D

5 1 C8 CAP., 2.2μF, X5R, 10V, 20%, 0402 WURTH ELEKTRONIK, 885012105013

6 1 C11 CAP., 100pF, C0G, 50V, 5%, 0402, AEC-Q200 MURATA, GCM1555C1H101JA16D

7 1 C12 CAP., 0.01μF, X7R, 25V, 10%, 0402, AEC-Q200 TAIYO YUDEN, TMK105B7103KVHF

8 1 C16 CAP., 1μF, X5R, 10V, 10%, 0402 SAMSUNG, CL05A105KP5NNNC

9 1 C17 CAP., 47pF, C0G, 50V, 10%, 0402 AVX, 04025A470KAT2A

10 1 C20 CAP., 0.1μF, X5R, 100V, 10%, 0402, SMD MURATA, GRM155R62A104KE14D

11 1 C24 CAP., 47μF, ALUM ELECT, 63V, 20%,

8mm × 10.2mm, F, SMD, RADIAL

PANASONIC, EEEHA1J470UP

12 1 C26 CAP., 2.2μF, X5R, 25V, 10%, 0603, AEC-Q200 TAIYO YUDEN, TMK107BBJ225KAHT

13 1 L1 IND., 47μH, PWR, SHIELDED, 20%, 3.1A,

4040DD, IHLE-5A SERIES, AEC-Q200

VISHAY, IHLE4040DDER470M5A

14 1 M1 XSTR., MOSFET, P-CH, 60V, 16A,

PowerPAK 1212-8, AEC-Q101

VISHAY, SQ7415AEN-T1-GE3

15 1 R1 RES., 0.05Ω, 1%, 1/2W, 1206, SENSE IRC, LRC-LR1206LF-01-R050-F

16 1 R2 RES., 12.7k, 1%, 1/16W, 0402 YAGEO, RC0402FR-0712K7L

17 1 R3 RES., 402k, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF4023X

18 1 R4 RES., 16k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040216K0JNED

19 1 R5 RES., 287k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402287KFKED

20 1 R6 RES., 24.9k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F2492TRF

21 1 R7 RES., 1M, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F1004TRF

22 2 R8, R15 RES., 100k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKED

23 1 R9 RES., 47k, 5%, 1/16W, 0402, AEC-Q200 NIC, NRC04J473TRF

24 1 R10 RES., 100k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED

25 1 R11 RES., 91k, 5%, 1/16W, 0402, AEC-Q200 NIC, NRC04J913TRF

26 1 R12 RES., 118k, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F1183TRF

27 1 R13 RES., 1M, 1%, 1/10W, 0402 NIC, NRC04F1004TRF

28 1 R14 RES., 2M, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04022M00FKED

29 1 U1 IC, 60V 2A, SYNCHRONOUS BUCK LED DRIVER,

LQFN-28

ANALOG DEVICES, LT8376RV#PBF

30 1 VR1 RES., 100k, 20%, 1/4W, SMD 4mm SQ, 1-TURN,

TOP ADJ., TRIMPOT

BOURNS, 3314J-1-104E

Optional EMI Filter Components

31 1 C13 CAP., 0.1μF, X7R, 100V, 10%, 0603 AVX, 06031C104KAT2A

32 1 C14 CAP., 4.7μF, X7S, 100V, 10%, 1210 SAMSUNG, CL32Y475KCVZW6E

33 1 C15 CAP., 0.1μF, X7R, 50V, 10%, 0402, AEC-Q200 MURATA, GCM155R71H104KE02D

34 0 FB1 IND., 1k AT 100MHz, FERRITE BEAD, 25%,

1.5A, 150mΩ, 0805

TDK, MPZ2012S102AT000

35 1 FB2 IND., 600Ω AT 100MHz, FERRITE BEAD, 25%,

2A, 100mΩ, 0805

TDK, MPZ2012S601AT000

DEMO MANUAL EVAL-LT8376-AZ

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

36 1 L2 IND., 15μH, PWD, 20%, 2.9A, 109mΩ, 4mm × 4mm,

AEC-Q200

COILCRAFT, XAL4040-153MEB

Optional Electrical Components

37 0 C9 CAP., 10μF, X7R, 50V, 10%, 1206 SAMSUNG, CL31B106KBHNNNE

38 0 C19, C22 CAP., OPTION, 0402

39 0 R18 RES., 0Ω, 1/16W, 0402 NIC, NRC04ZOTRF

40 0 R19 RES., OPTION, 0603

41 0 R20 RES., OPTION, 0402

42 0 TP1, TP3, TP4 TESTPOINT, PCB COPPER FEATURE N/A

43 0 TP2, TP5-TP7 TESTPOINT, PCB COPPER FEATURE N/A

Hardware: For Demo Board Only

44 6 E1, E6-E10 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB

0.062" THK

MILL-MAX, 2308-2-00-80-00-00-07-0

45 4 E2-E5 TEST POINT, TURRET, 0.094" MTG. HOLE, PCB

0.062" THK

MILL-MAX, 2501-2-00-80-00-00-07-0

46 3 JP1-JP3 CONN., HDR, MALE, 2×3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000621121

47 1 JP4 CONN., HDR, MALE, 2×2, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000421121

48 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.375" WURTH ELEKTRONIK, 702933000

49 4 XJP1-XJP4 CONN., SHUNT, FEMALE, 2-POS, 2mm WURTH ELEKTRONIK, 60800213421

DEMO MANUAL EVAL-LT8376-AZ

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog

Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications

subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

SCHEMATIC DIAGRAM

1. ALL RESISTORS ARE 0402, 1%.

ALL CAPACITORS ARE 0402

NOTE: UNLESS OTHERWISE SPECIFIED

350kHz

C26

2.2uF

0603

CTRL

C12

0.01uF

FB1

MPZ2012S102AT000

OPT

SQ7415AEN

R19

OPT

0603

JP1

LATCH OFF

DEFEAT

HICCUP

FAULT

5 6

C14

4.7uF

1210

100V

JP3

EXT

INT

PWM

5 6

FB2

MPZ2012S601AT000

2.2uF

0603

10V

E8 GND

0.47uF

100V

4.7uF

1210

EN/UVLO

2.2uF

C20

0.1uF

100V

E5 GND

LED-

LT8376

VOUT 14

GND

VREF

CTRL

EN/UVLO

27 FB 4

NC 36

GND

ISN 6

NC 34

ISP 5

NC 35

GND

PWMTG 13

NC 33

INTVCC 25

FAULT 8

SW 19

SW 18

SYNC/SPRD 11

VIN 16

VIN 17

VIN 20

VIN 21

VIN

BOOST 24

ISMON

PWM

GND

R14

10uF

1206

50V

24.9k

TP6

GND

EMIVIN

43V-57V

287K

LED+

36VLED

1.5A

TP7

ISMON

C11

100pF

TP1

R13

C13

0.1uF

100V

0603

C15

0.1uF

50V

1206

50V

OPT

R12

118k

R20

OPT

47k 5%

R11

91k

402k

TP2

VOUT

15uH

XAL4040-153MEB

12.7k

C17

47pF

E10

EXT SYNC

R18

OPT

C22

OPT

PWM

R10

100k

GND

0805

100V

JP2

EXT SYNC

NO SSFM

SSFM

SYNC/SSFM

5 6

JP4

HDR

EXT/ON

INT

3 4

100k

R15

100k

TP4

INJ1

VIN

0.47uF

100V

0805

C24

47uF

EEEHA1J470UP

63V

0603

C16

1uF

VR1

100k

3314J-1-104E

1 3

TP3

INJ2

TP5

FAULT

_____

16k

0.05

1206

L1 47uH

IHLE4040DDER470M5A

C19

OPT

INTVCC

VREF

INTVCC

VREF

DEMO MANUAL EVAL-LT8376-AZ

Rev. 0

 ANALOG DEVICES, INC. 2022

02/22

www.analog.com

ESD Caution

ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection

circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

Legal Terms and Conditions

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conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation

Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”)

and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to

Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and

agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted

is expressly made subject to the following additional limitations:Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board;and (ii) permit any Third

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be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of

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