Analog Devices DC2575A Guide de configuration rapide

Rev. A

DEMO MANUAL DC2575A

DESCRIPTION

LT8391AIFE

60V 2MHz Synchronous

1.5A Buck-Boost LED Driver

Demonstration circuit DC2575A is a 60V 2MHz synchro-

nous buck-boost LED driver featuring the LT8391A. It

accepts an input voltage from 4V to 60V and drives a

single string of LEDs up to 16V at 1.5A. DC2575A runs at

2MHz switching frequency and features spread spectrum

frequency modulation (SSFM) which can be enabled with

a simple jumper. SSFM spreads the switching frequency

from fSW to fSW+25% for reduced EMI. SSFM is not nec-

essary in applications where EMI is not important.

DC2575A uses AEC-Q automotive-approved components

such as power MOSFETs, diodes, input and output capaci-

tors and inductors.

The LT8391A has an adjustable switching frequency

between 600kHz and 2MHz. The jumper also allows exter-

nal frequency synchronization.

The LT8391A can be PWM dimmed with an external PWM

signal and an internally-generated PWM signal. DC2575A

has a jumper that can be 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.

When run with both PWM dimming and spread spectrum,

the spread spectrum aligns itself with the PWM signal for

flicker-free operation.

The LT8391A features both open LED and short LED

(LED+to GND) protection as well as a fault output flag.

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 board is designed with capaci-

tors on 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 18V if the LED

string is opened. 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.

EMI filters and gate resistors on the demo circuit reduce

this high power converter’s EMI below CISPR 25 Class 5

limits. This is intended for automotive applications where

CISPR 25 EMI standards are observed. In non-automotive

applications, where EMI may not be as important, the

input and output filters as well as the gate resistors can

be removed for higher efficiency. Please note the optional

EMI components in the parts list.

The LT8391A 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 DC2575A. The LT8391AIFE 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.

Rev. A

DEMO MANUAL DC2575A

QUICK START PROCEDURE

Demonstration circuit 2575A is easy to set up to evaluate

the performance of the LT8391A. Follow the procedure

below:

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

with forward voltage less than or equal to 16V (at

1.5A) to the LED+and LED–banana jacks on the PCB

as shown in Figure 1.

2. Connect the EN/UVLO terminal to GND.

3. Set JP2 to EXT/ON and JP3 to ON for 100% always-

on LED operation. Set JP1 to NO SSFM/SYNC to run

without SSFM.

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

PVIN 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, sim-

ply 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 JP2 to EXT/ON and JP3 to EXT. Attach a 3V rect-

angular waveform with varying duty cycle to the PWM

terminal.

10. To change brightness with internally-generated PWM

dimming, set JP2 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

JP1 to SSFM ON.

Table 1. Typical Performance Summary for DC2575A (LT8391A)

PARAMETER CONDITIONS MIN TYP MAX

Input Voltage PVIN Range Operating VLED ≤16V 4V 60V

Switching Frequency (fSW) R3 = 59.0k, JP1 = NO SSFM/SYNC 2.0MHz

Spread Spectrum (SSFM) Frequency Range JP1 = SSFM ON fSW fSW • 1.25

ILED R2 = 0.056Ω 7.0V < PVIN < 60V VLED ≤16V

R9 = 90.9k, R10 = 113k

1.5A

VLED range R5 = 1M, R6 = 54.9k 4.8V 16V

Open LED Voltage VOUT R5 = 1M, R6 = 54.9k 18.2V

Typical Efficiency (100% PWM DC) PVIN = 13V, VLED = 16V, ILED = 1.5A 92%

Internally-Generated PWM Dimming Range JP2 = INT, JP3 = INT 1/128 100%

Internally-Generated PWM Dimming Frequency JP2 = INT, JP3 = INT R30 = 301k, R3 = 59.0k 488Hz

Peak Switch Current Limit Boost Region R1 = 0.006Ω 8.3A

Peak Switch Current Limit Buck Region R1 = 0.006Ω 8.3A

PVIN Undervoltage Lockout (UVLO) falling R7 = 383k, R8 = 165k 4.3V

PVIN Enable Turn-On (EN) Rising R7 = 383k, R8 = 165k 5.1V

Rev. A

DEMO MANUAL DC2575A

QUICK START PROCEDURE

Figure 1. Test Procedure Setup Drawing for DC2575A

–

+–

ILED VOUT

VIN

UP TO

16V MAX

1.5A

LED

STRING

+–

IIN

0V 2V

1V 2V

OPTIONAL

ANALOG

DIMMING

OPTIONAL

SYNC

OPTIONAL

CONNECT EN/UVLO

TO GND FOR

SHUTDOWN

INPUT

SUPPLY

EXTERNAL

INTERNAL

PWM DIMMING

FAULT

FLAG

–

100

0 10 20 30 40 50

EFFICIENCY (%)

INPUT VOLTAGE (V)

DC2575 F02

16V 1.5A LEDs

Figure 2. DC2575A Efficiency Versus Input Voltage for 16V 1.5A LED Load

Rev. A

DEMO MANUAL DC2575A

QUICK START PROCEDURE

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

Brightness Control with Both (a) Externally- and (b) Internally-Generated PWM Dimming (with EMI Filters)

WITH DC2575A EMI FILTERS

VPWM

ILED 1A/DIV

16V 1.5A LEDs

2000:1 100Hz PWM

EXTERNAL

128:1 500Hz PWM

INTERNAL

16V 1.5A LEDs

WITH DC2575A EMI FILTERS

Rev. A

DEMO MANUAL DC2575A

QUICK START PROCEDURE

Figure 4. Infinite-Persist Scope Traces Show PWM Dimming and SSFM Working Together for Flicker-Free Brightness

Control with Both (a) Externally- and (b) Internally-Generated PWM Dimming (with EMI Filters Removed)

WITHOUT DC2575A EMI FILTERS

VPWM

ILED 1A/DIV

16V 1.5A LEDs

2000:1 100Hz PWM

EXTERNAL

128:1 500Hz PWM

INTERNAL

16V 1.5A LEDs

WITHOUT DC2575A EMI FILTERS

Rev. A

DEMO MANUAL DC2575A

QUICK START PROCEDURE

Figure 5. DC2575A (LT8391A) Passes CISPR 25 Class 5 Radiated EMI

DC2575 F05a

0.1 1

PEAK RADIATED EMI (dBµV/m)

MHz

16V 1.5A LEDs

12VIN

2MHz

CISPR 25 CLASS 5

RADIATED EMI LIMITS

DC2575 F05b

–10

0 100 200 300 400 500 600 700 800 900

1000

PEAK RADIATED EMI (dBµV/m)

MHz

16V 1.5A LEDs

12VIN

2MHz

CISPR 25 CLASS 5

RADIATED EMI LIMITS

DC2575 F05c

0.1 1

–10

AVERAGE RADIATED EMI (dBµV/m)

MHz

16V 1.5A LEDs

12VIN

2MHz

CISPR 25 CLASS 5

RADIATED EMI LIMITS

DC2575 F05d

–10

1000900800700600500400300200100

AVERAGE RADIATED EMI (dBuV/m)

MHz

16V 1.5A LEDs

12VIN

2MHz

CISPR 25 CLASS 5

RADIATED EMI LIMITS

Rev. A

DEMO MANUAL DC2575A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., 1µF, X7S, 100V, 10%, 0805 MURATA, GRJ21BC72A105KE11L

2 1 C2 CAP., 4.7µF, X5R, 10V, 10%, 0402 TDK, C1005X5R1A475K050BC

3 1 C3 CAP., 0.47µF, X5R, 16V, 10%, 0402 TAIYO YUDEN, EMK105ABJ474KV-F

4 1 C4 CAP., 3300pF, X7R, 16V, 10%, 0402 MURATA, GRM15XR71C332KA86D

5 1 C5 CAP., 0.022µF, X7R, 25V, 10%, 0402, AEC-Q200, NO SUBS.

ALLOWED

MURATA, GCM155R71E223KA55D

6 1 C6 CAP., 1µF, X7R, 25V, 10%, 0603 MURATA, GRM188R71E105KA12D

7 2 C7, C8 CAP., 0.1µF, X7R, 25V, 10%, 0402, AEC-Q200, NO SUBS.

ALLOWED

TDK, CGA2B3X7R1E104K050BB

8 1 C10 CAP., 22µF, ALUM., 63V, 20%, SMD 6.3mm ×7.7mm, D8, AEC-

Q200

PANASONIC, EEHZC1J220XP

9 2 C12, C32 CAP., 4.7µF, X7S, 100V, 10%, 1210, AEC-Q200, NO SUBS.

ALLOWED

MURATA, GCM32DC72A475KE02L

10 2 C14, C20 CAP., 10µF, X5R, 25V, 20%, 1210, AEC-Q200, NO SUBS. ALLOWED MURATA, GCM32ER71E106KA57L

11 2 D1, D2 DIODE, SCHOTTKY, 100V, 250mA, SOD323F, AEC-Q101 NEXPERIA, BAT46WJ,115

12 2 M1, M2 XSTR., MOSFET, N-CH, 60V, 22A, LFPAK33-8, AEC-Q101 NEXPERIA, BUK9M42-60E

13 2 M3, M4 XSTR., MOSFET, N-CH, 40V, 40A, PG-TSDSON-8, AEC-Q101 INFINEON, IPZ40N04S5L-7R4

14 1 L1 IND., 2.2µH, PWR, 20%, 9.2A, 14.5mΩ, 5.48mm ×5.28mm,

XAL5030, AEC-Q200

COILCRAFT, XAL5030-222MEC

15 1 Q1 XSTR., MOSFET, P-CH, 30V, 4.2A, SOT23-3 (TO-236AB), AEC-Q101 NEXPERIA, PMV50EPEA

16 1 R1 RES.,0.006Ω,1%,1.5W,1206, LONG-SIDE TERM.,KRL3216E,

SENSE, AEC-Q200

SUSUMU, KRL3216E-C-R006-F-T1

17 1 R2 RES.,0.056Ω, 1%, 1/2W, 1206, SHORT-SIDE TERM., RL1632,

SENSE

SUSUMU, RL1632R-R056-F

18 1 R3 RES., 59.0kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040259K0FKED

19 1 R4 RES.,4.7kΩ, 5%, 1/16W,0402 NIC, NRC04J472TRF

20 1 R5 RES.,1MΩ, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF1004V

21 1 R6 RES., 54.9kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040254K9FKED

22 1 R7 RES., 383kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402383KFKED

23 1 R8 RES., 165kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402165KFKED

24 1 U1 IC,4-Switch Buck-Boost LED CTRLR,TSSOP-28FE ANALOG DEVICES, LT8391AIFE#PBF

Optional Low EMI Electrical Components

1 3 C34, C35, C36 CAP.,0.1uF,X5R,100V,10%,0402,NO SUBS. ALLOWED MURATA, GRM155R62A104KE14D

2 3 C37, C38, C44 CAP.,0.1uF,X7R,25V,10%,0402,AEC-Q200, NO SUBS. ALLOWED TDK, CGA2B3X7R1E104K050BB

3 2 C40, C41 CAP.,4.7uF,X7S,100V,10%,1210,AEC-Q200, NO SUBS. ALLOWED MURATA, GCM32DC72A475KE02L

4 2 D3, D4 DIODE,SCHOTTKY,20V,1A,SOD523-2 NEXPERIA, PMEG2010AEB,115

5 2 FB1, FB2 IND.,220 OHMS,BEAD,

FERRITE,25%,3A,40mOHMS,0805,AEC-Q200

TDK, MPZ2012S221ATD25

6 2 FB3, FB4 IND.,1k OHM,BEAD,

FERRITE,25%,1.5A,150mOHMS,0805,AEC-Q200

TDK, MPZ2012S102ATD25

7 2 R15, R17 RES.,10 OHMS,5%,1/16W,0402 VISHAY, CRCW040210R0JNED

8 2 R32, R33 RES.,5.1,OHMS,1%,1/16W,0402,AEC-Q200 VISHAY, CRCW04025R10FKED

Rev. A

DEMO MANUAL DC2575A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Other Optional Electrical Components

1 0 C18, C26, C27, C28,

C39 (OPT)

CAP., OPTION, 0402

2 0 C29, C30 (OPT) CAP., 0805, OPTION

3 0 C43 (OPT) CAP., OPTION, 0603

4 1 D5 DIODE, SCHOTTKY, 30V, 1A, SOD523-2, AEC-Q101 NEXPERIA, PMEG3010EB,115

5 0 D6, D7 (OPT) DIODE, OPTION, SOD-123

6 1 R9 RES., 90.9kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040290K9FKED

7 1 R10 RES., 113kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402113KFKED

8 1 R11 RES., 100kΩ, 1%, 1/16W, 0402 NIC, NRC04F1003TRF

9 0 R12, R18, R19, R20,

R21, R31 (OPT)

RES., OPTION, 0402

10 3 R13, R14, R16 RES., 0Ω, 1/16W, 0402 VISHAY, CRCW04020000Z0ED

11 0 R22, R23 (OPT) RES., OPTION, 0805

12 1 R27 RES., 100kΩ, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED

13 1 R29 RES., 91kΩ, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040291K0JNED

14 1 R30 RES., 301kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402301KFKED

15 1 VR1 RES., 100kΩ, 20%, 1/4W, SMD 4mm SQUARE,TRIMPOT, J-HOOK,

1-TURN

BOURNS, 3314J-1-104E

Hardware

1 2 J1, J2 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED, SWAGE KEYSTONE, 575-4

2 2 JP1, JP3 CONN., HDR, MALE, 2×3, 2mm, THT, STR WURTH ELEKTRONIK, 62000621121

3 1 JP2 CONN., HDR, MALE, 1×3, 2mm, THT, STR WURTH ELEKTRONIK, 62000311121

4 3 XJP1, XJP2, XJP3 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

5 4 E1, E2, E9, E10 TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

6 8 E3, E4, E5, E6, E7, E8,

E11, E12

TEST POINT, TURRET, 0.064", MTG. HOLE MILL-MAX, 2308-2-00-80-00-00-07-0

7 4 MH1, MH2, MH3, MH4 STANDOFF, NYLON, SNAP-ON, 0.375" WURTH ELEKTRONIK, 702933000

Rev. A

DEMO MANUAL DC2575A

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

PVIN

4V - 60V

EN/UVLO

GND

ALL CAPACITORS ARE 0402.

NOTE: UNLESS OTHERWISE SPECIFIED

2MHz

ALL RESISTORS ARE 0402.

15V LED

LED+

FAULT

CTRL2

SYNC

GND

CTRL1

PWM

LED-

1.5A

OUT

VREF

C38

0.1uF

25V

1uF

100V

0805

C14

10uF

1210

25V

22nF

IPZ40N04S5L-7R4

90.9K

4.7K

C30

OPT

0805 R13

R30

301K

500Hz

R10

113K

R32

5.1

R19

OPT

0.056

1206

C8 0.1uF

R18

OPT

PMV50EPEA

59.0K

JP1

SSFM ON

EXT SYNC

NO SSFM/SYNC

SYNC/SSFM

LT8391AIFE

EN/UVLO 9

FAULT

CTRL1

PWM 11

ISP 14

SYNC/SPRD

PWMTG

VREF

CTRL2

LSN 6

LSP 5

ISN 15

FB 19

TG2 25

SW2 26

BG2 28

BG1 1

SW1 3

TG1 4

BST1 2

BST2 27

VIN7

INTVCC

GND

VOUT 24

R22

OPT

0805

R21

OPT

C40

4.7uF

1210

100V

JP2

EXT/ON

INT

C32

4.7uF

1210

100V

R15

C36

0.1uF

0402

100V

4.7uF

10V

BAT46WJ

R11

100K

C39

OPT

0603

C29

OPT

0805

R14

1uF

25V

0603

BUK9M42-60E

FB1

MPZ2012S221ATD

C35

0.1uF

0402

100V

BUK9M42-60E

C12

4.7uF

1210

100V

C44

0.1uF

25V

0.006

KRL3216

OPT

C37

0.1uF

25V

E11

R31

OPT

R20

OPT

R12

OPT

PMEG2010AEB

0.47uF

R16

VR1

100K

3314J-1-104E

BAT46WJ

C27

OPT

FB4

R33

5.1

R27

100K

FB2

MPZ2012S221ATD

C43

OPT

0603

165K

PMEG3010EB

C20

10uF

1210

25V

E10

C26

OPT

R17

C41

4.7uF

1210

100V

JP3

EXT

INT

PWM

2.2uH

XAL5030-222MEB

R23

OPT

0805

OPT

0.1uF

E12

C28

OPT

54.9K

PMEG2010AEB

C18

OPT

IPZ40N04S5L-7R4

C10

22uF

63V

EEHZC1J220XP

3.3nF

R29

91k

C34

0.1uF

0402

100V

FB3

MPZ2012S102ATD25

383K

ISP

ISN

INTVCC

VREF

PWMTG

VREF

INTVCC

Rev. A

DEMO MANUAL DC2575A

 ANALOG DEVICES, INC. 2017–2019

09/19

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.

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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

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