Analog Devices DC3103A Manual de usuario

DEMO MANUAL DC3103A

Rev. 0

DESCRIPTION

LT3942

36V 4-Switch Buck-Boost

Voltage Regulator

Demonstration circuit DC3103A is a monolithic 4-Switch

buck-boost voltage regulator featuring the LT

3942. It

has been designed with an output voltage set to 12V with

capability of delivering up to 1A when the input voltage is

between 7V and 36V. The demonstration circuit continues

operating with an input voltage as low as 3V with reduced

output power capability. DC3103A is configured for 2MHz

switching frequency with spread spectrum frequency

modulation (SSFM) disabled. When enabled, SSFM

adjusts the switching frequency of the LT3942 between

2MHz and 2.5MHz for improved EMI performance.

The LT3942 has an operating input voltage range of 3V

to 36V. It has internal, synchronous 40V switches for

high efficiency and small size. It has an adjustable switch-

ing frequency between 300kHz and 2MHz. The LT3942

can by synchronized to an external oscillator source,

programmed with SSFM enabled for low EMI, or set to

normal operation.

The board is designed with ceramic capacitors placed

near the PVIN and PVOUT pins to form a compact high

frequency hotloop. SMD pads are available to install an

optional ferrite bead EMI filter on both the input and

output of DC3103A. Small cuts on the top layer copper

between the SMD pads of both ferrite bead components

are necessary to install the EMI filter correctly. These

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

filters, combined with proper board layout and SSFM,

are effective in reducing both radiated and conducted EMI.

Please follow the recommended layout and four-layer PCB

thickness of DC3103A for low EMI applications.

DC3103A uses the LT3942’s voltage regulation loop to

program a constant-voltage output of 12V. The LT3942

can operate as a constant voltage regulator as well as

a constant current regulator. For LED driver designs,

please refer to demonstration circuit DC2404A. DC2404A

includes a high-side PMOS disconnect switch to assist

with PWM dimming, as well as several other optimizations

for LED driver applications.

The LT3942 datasheet gives a complete description of the

part, operation, and applications information. The data-

sheet must be read in conjunction with this User Guide

for DC3103A. The LT3942EUFD is assembled in a 28-lead

plastic QFN (UFD) package with a thermally-enhanced

exposed ground pad. Proper board layout is essential for

maximum thermal and low-noise performance. Refer to

DC3103A’s design files files for recommended layout and

routing of the LT3942 for voltage regulator applications.

Design files for this circuit board are available.

DEMO MANUAL DC3103A

Rev. 0

QUICK START PROCEDURE

Demonstration circuit DC3103A is easy to set up to evaluate

the performance of the LT3942. Follow the procedure below.

1. With power off, connect a load capable of 12V 1A

operation between the VOUT and GND turrets on the

PCB as shown in Figure1.

2. Connect the EN/UVLO turret to GND.

3. Set JP1 to NO SSFM/SYNC to run without SSFM.

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

and GND turrets. Make sure that the DC input

voltage will not exceed 40V.

5. Turn the input power supply on and adjust the voltage

between 7V and 36V for full output power capability

and accurate 12V output regulation. Below 7V, output

power capability is reduced.

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

7. Observe the load running at the programmed output

voltage.

8. To enable spread spectrum frequency modulation, set

JP1 to SSFM ON.

PERFORMANCE SUMMARY

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage PVIN Range Operating 3 36 V

Input Voltage PVIN Range (Full Power) VOUT = 12V, IOUT = 1A 7 36 V

Switching Frequency (fSW) R4 = 14.3kΩ, JP1 = NO SSFM/SYNC 2.0 MHz

Spread Spectrum (SSFM) Range R4 = 14.3kΩ, JP1 = SSFM 2.0 2.5 MHz

Output Voltage VOUT R2 = 110kΩ, R3 = 10kΩ 12 V

Typical Efficiency PVIN = 12V, VOUT = 12V, IOUT = 1A, fSW = 2MHz

JP1 = NO SSFM/SYNC

89 %

Peak Switch Current Limit 2.2 2.5 2.8 A

PVIN Undervoltage Lockout (UVLO) Falling R7 = 402kΩ, R12 = 324kΩ 3.0 V

PVIN Enable Turn-On (EN) Rising R7 = 402kΩ, R12 = 324kΩ 4.0 V

PVIN Quiescent Current VEN/UVLO = 0.3V, VOUT = 12V

VEN/UVLO = 1.3V, VOUT = 12V, Not Switching

0.9

2.6

µA

Figure1. . Test Procedure Setup Drawing for DC3103A

DEMO MANUAL DC3103A

Rev. 0

QUICK START PROCEDURE

Figure2. DC3103A Efficiency vs Input Voltage, SSFM OFF Figure3. DC3103A Efficiency vs Load Current, SSFM OFF

Figure4. DC3103A 10% to 100% Load Step Transient Figure5. DC3103A Output Ripple (20MHz Bandwidth Limit)

Figure6. DC3103A Thermal Image, 10 Minute Runtime, 23°C

Ambient PVIN = 12V, VOUT = 12V, IOUT = 1A, SSFM OFF

OUT

= 12V

OUT

= 1A

OUT

= 0.5A

(V)

100

EFFICIENCY (%)

Efﬁciency vs Input Voltage

DC3103A

OUT

= 12V

9PV

12PV

24PV

36PV

OUT

(A)

0.01

0.1

100

EFFICIENCY (%)

Efﬁciency vs Load Current

DC3103A

Output Transient Response

DC3103A

100mA

OUT

= 12V

200µs/DIV

OUT(AC)

100mV/DIV

OUT

500mA/DIV

Output Ripple (V

OUT

= 12V I

OUT

=1A)

DC3103A

9PV

12PV

24PV

36PV

200ns/DIV

OUT(AC)

50mV/DIV

DEMO MANUAL DC3103A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., 10uF, X5R, 50V, 10%, 1206 TAIYO YUDEN, UMK316BBJ106KL-T

2 1 C2 CAP., 0.47uF, X5R, 50V, 10%, 0402 MURATA, GRM155R61H474KE11D

3 1 C3 CAP., 2.2uF, X5R, 6.3V, 10%, 0402 AVX, 04026D225KAT2A

4 3 C4, C8, C9 CAP., 0.1uF, X7R, 10V, 10%, 0402 AVX, 0402ZC104KAT2A

5 1 C5 CAP., 0.22uF, X7R, 6.3V, 10%, 0402 KEMET, C0402C224K9RACTU

6 1 C6 CAP., 470pF, C0G, 50V, 5%, 0402, AEC-Q200 TDK, CGA2B2C0G1H471J050BA

7 1 C7 CAP., 10uF, X7R, 25V, 10%, 1206 AVX, 12063C106KAT2A

8 1 C18 CAP., 68uF, ALUM POLY HYB, 25V, 20%, 6.3x5.8mm,

SMD, RADIAL, AEC-Q200

PANASONIC, EEHZK1E680P

9 1 L1 IND., 3.3uH, WE-MAPI, 20%, 2.2A, 114mOHMS,

3020

WURTH ELEKTRONIK, 74438336033

10 1 R2 RES., 110k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402110KFKED

11 1 R3 RES., 10k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED

12 1 R4 RES., 14.3k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF1432X

13 1 R5 RES., 68k OHMS, 5%, 1/16W, 0402 VISHAY, CRCW040268K0JNED

14 1 R7 RES., 402k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF4023X

15 1 R9 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED

16 1 R10 RES., 34.8k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF3482X

17 1 R11 RES., 1M OHM, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00JNED

18 1 R12 RES., 324k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF3243X

19 1 U1 IC, 36V, 2A SYNC. BUCK-BOOST CVRTR, QFN-28, ANALOG DEVICES, LT3942EUFD#PBF

Additional Demo Board Circuit Components

1 1 C10 CAP., 22uF, ALUM POLY HYB, 50V, 20%, 6.3x5.8mm,

SMD, RADIAL, AEC-Q200

PANASONIC, EEHZC1H220P

2 0 C11, C19 CAP., OPTION, ALUM. ELECT., SMD

3 0 C13, C15, C16, C20 CAP., OPTION, 0402

4 0 C14 CAP., OPTION, 1206

5 0 FB1, FB2 IND., FERRITE BEAD, OPT, 0805

6 0 R1, R20, R23 RES., OPTION, 0805

7 0 R15, R16, R17, R24, R25 RES., OPTION, 0402

8 2 R18, R19 RES., 0 OHM, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2GE0R00X

9 1 R22 RES., 0 OHM, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04020000Z0ED

10 1 R13 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED

Hardware: For Demo Board Only

1 4 E1, E4, E7, E8 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB

0.062" THK

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

2 4 E2, E3, E10, E11 TEST POINT, TURRET, 0.094" MTG. HOLE, PCB

0.062" THK

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

3 1 JP1 CONN., HDR, MALE, 2x3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000621121

4 1 XJP1 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

DEMO MANUAL DC3103A

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

D D

C C

B B

A A

1. ALL RESISTORS ARE 0402 5%.

ALL CAPACITORS ARE 0402.

NOTE: UNLESS OTHERWISE SPECIFIED

2MHz

SEE USER GUIDE

INTVCC

VREF

INTVCC

VIN

INTVCC

DATE:

SHEET OF

TITLE: SCHEMATIC

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

www.analog.com

SKU NO.

IC NO.

ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

36V 4-SWITCH BUCK-BOOST VOLTAGE REGULATOR

710-DC3103A_REV02

N/A

LT3942EUFD

DC3103A

Monday, February 01, 2021

DATE:

SHEET OF

TITLE: SCHEMATIC

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

www.analog.com

SKU NO.

IC NO.

ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

36V 4-SWITCH BUCK-BOOST VOLTAGE REGULATOR

710-DC3103A_REV02

N/A

LT3942EUFD

DC3103A

Monday, February 01, 2021

DATE:

SHEET OF

TITLE: SCHEMATIC

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

www.analog.com

SKU NO.

IC NO.

ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

36V 4-SWITCH BUCK-BOOST VOLTAGE REGULATOR

710-DC3103A_REV02

N/A

LT3942EUFD

DC3103A

Monday, February 01, 2021

0.1uF

10V

FB1

OPT

0805

LT3942EUFD

VIN

PVIN

EN/UVLO

OVLO

INTVCC

FAULT

VREF

CTRL

PWM

PVOUT 22

PVOUT 21

ISP 11

ISN 12

FB 16

PWMTG 20

ISMON 13

VC 17

RT 18

SYNC/SPRD 19

BST1 26

SW1 27

SW1 28

SW2 23

SW2 24

BST2 25

GND

C20

OPT

R24

OPT

VIN

100k

E8 SYNC

14.3k

TP3 ISMON

2.2uF R13

100k

C11

OPT

JP1

SSFM

EXT SYNC

NO SSFM/SYNC

SYNC/SPRD

5 6

GND

C19

OPT

C14

OPT

1206

C13

OPT

0805

TP1

FAULT

_____

402k

TP2 LOOP INJ

R17

OPT

C15

OPT

GND

R16

OPT

R15

OPT

E10 GND

R10

34.8k

C16

OPT

R11

R18 0

10k

R22

R23

OPT

0805

R12

324k

0.22uF

R19 0

0.1uF

10uF

50V

1206

3.3uH

74438336033

3V - 36V

PVIN

470pF

0.47uF

50V C7

10uF

1206

25V

C10

22uF

50V

EEHZC1H220P

E11 VOUT

12V 1A

FB2

OPT

0805

R25

OPT

68k

R20

OPT

0805

110K

EN/UVLO

0.1uF

10V

C18

68uF

EEHZK1E680P

25V

ISN

ISP

ISN

ISP

DEMO MANUAL DC3103A

Rev. 0

 ANALOG DEVICES, INC. 2021

06/21

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

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