Linear Technology DC1498A Guida rapida alla configurazione

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DEMO MANUAL DC1498A

Description

LTM4620EV

High Efficiency, Dual 13A Step-Down

Power µModule Regulator

DC1498A features the LTM

4620EV, the high efficiency,

high density, dual 13A, switch mode step-down power

module regulator. The input voltage is from 4.5V to 16V.

The output voltage is programmable from 0.6V to 2.5V.

DC1498A can deliver nominal 12A output current and

up to 13A maximum in each channel. As explained in

the data sheet, output current derating is necessary for

certain VIN, VOUT, and thermal conditions. The board

operates in continuous conduction mode in heavy load

conditions. For high efficiency at low load currents, the

MODE jumper (JP1) selects pulse-skipping mode fornoise

sensitive applications or Burst-Mode

operation in less

noise sensitive applications.Two outputs can be connected

in parallel for a single 26A output solution with optional

jumper resistors. The board allows the user to program

how its output ramps up and down through the TRACK/SS

pin. The output can be set up to either coincidentally or

ratiometrically track with another supply’s output. Remote

output voltage sensing is available for improved output

voltage regulation at the load point. These features and

the availability of the LTM4620EV in a compact 15mm ×

15mm × 4.41mm LGA package make it ideal for use in

many high-density point-of-load regulation applications.

The LTM4620 data sheet must be read in conjunction

with this demo manual prior to working on or modifying

DC1498A.

Design files for this circuit board are available at

http://www.linear.com/demo

L, LT, LTC, LTM, µModule, Linear Technology, the Linear logo and µModule are registered

trademarks of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

BoarD photo

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DEMO MANUAL DC1498A

Quick start proceDure

DC1498A is easy to set up to evaluate the performance

of the LTM4620EV. Please refer to Figure 1 for proper

measurement setup and follow the procedure below:

1. Place jumpers in the following positions for a typical

application:

JP1 JP2 JP3 JP4 JP5 JP6

MODE RUN1 RUN2 TRACK1

SEL.

TRACK2

SEL.

CLKOUT

PHASE

CCM ON ON Soft-Start Soft-Start 90°

2. With power off, connect the input power supply, load

and meters as shown in Figure 1. Preset the load to 0A

and VIN supply to 12V.

3. Turn on the power supply at the input. The output volt-

age in channel 1 should be 1.5V ±1.5% (1.4775V to

1.525V) and the output voltage in channel 2 should be

1.2V ± 1.5% (1.182V to 1.218V).

4. Once the proper output voltage is established, adjust the

load within the operating range and observe the output

voltage regulation, output voltage ripple, efficiency and

other parameters. Output ripple should be measured

at J1 and J2 with BNC cables. 50Ω termination should

be set on the oscilloscope or BNC cables.

5. (Optional) For optional load transient test, apply an

adjustable pulse signal between IOSTEP CLK and GND

test point. Pulse amplitude (3V to 3.5V) sets the load

step current amplitude. The output transient current

can be monitored at the BNC connector J3 (15mV/A).

The pulse signal should have very small duty cycle

(<10%) to limit the thermal stress on the transient

load circuit. Switch the jumper resistors R34 or R35

(on the backside of boards) to apply load transient on

channel 1 or channel 2 correspondingly.

performance summary

(TA= 25°C)

PARAMETER CONDITIONS VALUE

Input Voltage Range 4.5V to 16V

Output Voltage VOUT1 VIN = 4.5V to 16V, IOUT1 = 0A to 12A, JP1: CCM 1.5V ±1.5% (1.4775V to 1.5225V)

Output Voltage VOUT2 VIN = 4.5V to 16V, IOUT2 = 0A to 12A, JP1: CCM 1.2V ±1.5% (1.182V to 1.218V)

Per-Channel Maximum Continuous Output Current Derating is Necessary for Certain VIN, VOUT and Thermal

Conditions. See data sheet for detail.

13A (Per Channel)

Default Operating Frequency 600kHz

Resistor Programmable Frequency Range 250kHz to 780kHz

External Clock Synchronous Frequency Range 400kHz to 780kHz

Efficiency of Channel 1 VIN = 5V, VOUT1 = 1.5V, IOUT1 = 13A, fSW = 600kHz 87.7% See Figure 2

Efficiency of Channel 2 VIN = 5V, VOUT2 = 1.2V, IOUT2 = 13A, fSW = 600kHz 85.1% See Figure 3

Load Transient of Channel 1 VIN = 12V, VOUT1 = 1.5V, ISETP = 0A to 6A See Figure 4

Load Transient of Channel 2 VIN = 12V, VOUT2 = 1.2V, ISETP = 0A to 6A See Figure 5

LTM4620 Demo Cards for Up to 100A Point-of-Load Regulation

MAXIMUM OUTPUT CURRENT (A) NUMBER OF OUTPUT VOLTAGES

NUMBER OF LTM4620 µMODULE

REGULATORS ON THE BOARD DEMO CARD NUMBER

13, 13 2 1 DC1498A

50 1 2 DC1780A-A

75 1 3 DC1780A-B

100 1 4 DC1780A-C

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DEMO MANUAL DC1498A

Figure 1. Test Setup of DC1498A

Quick start proceDure

6. (Optional) LTM4620 can be synchronized to an external

clock signal. Place the JP1 jumper on EXT_CLK and

apply a clock signal (0V to 5V, square wave) on the

CLKIN test point.

7. (Optional) The outputs of LTM4620 can track another

supply. The jumpers JP4 and JP5 allow choosing soft-

start or output tracking. If tracking external voltage is

selected, the corresponding test points, TRACK1 and

TRACK2, need to be connected to a valid voltage signal.

8. (Optional) LTM4620 can be configured for a 2-phase

single output at up to 26A on DC1498A. Install 0Ω

resistors on R14, R17, R28, R39 and remove R7, R19.

Output voltage is set by R25 based on equation VOUT =

0.6V (1 + 60.4k/R25).

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DEMO MANUAL DC1498A

Quick start proceDure

Figure 2. Measured Efficiency on Channel 1.

VOUT1 = 1.5V, fSW = 600kHz, Channel 2 Disabled

Figure 3. Measured Efficiency on Channel 2

VOUT2 = 1.2V, fSW = 600kHz, Channel 1 Disabled

LOAD CURRENT (A)

EFFICIENCY (%)

60 82

DC1498A F02

146 12104

VIN = 5V

VIN = 9V

VIN = 12V

VIN = 15V

LOAD CURRENT (A)

EFFICIENCY (%)

60 82

DC1498A F03

146 12104

VIN = 5V

VIN = 9V

VIN = 12V

VIN = 15V

Figure 4. Measured Channel 1

0A to 6A Load Transient, VIN = 12V, VOUT1 = 1.5V

Figure 5. Measured Channel 2

0A to 6A Load Transient, VIN = 12V, VOUT2 = 1.2V

100µs/DIV

100mV/DIV

DC1498A F04

1.5VOUT (20MHz BW)

0A TO 6A LOAD STEP

100µs/DIV

100mV/DIV

DC1498A F05

1.2VOUT (20MHz BW)

0A TO 6A LOAD STEP

5µs/DIV

50mV/DIV

DC1498A F06

1.5VOUT (20MHz BW)

1.2VOUT (20MHz BW)

Figure 6. Measured Output Voltage Ripple at 5V

Input, 1.5V and 1.2V Output, 13A Per Channel

with Standard Demo Circuit Default Setup

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DEMO MANUAL DC1498A

Quick start proceDure

Figure 7. Thermal Capture at 5VIN, 1.5VOUT at 12A and 1.2VOUT at 12A.

Ambient Temperature = 30°C, No Airflow and No Heat Sink

Figure 8. Thermal Capture at 5VIN, 1.5VOUT at 13A and 1.2VOUT at 13A.

Ambient Temperature = 30°C, No Airflow and No Heat Sink

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DEMO MANUAL DC1498A

Quick start proceDure

Figure 9. Thermal Capture at 12VIN, 1.5VOUT at 12A and 1.2VOUT at 12A.

Ambient Temperature = 30°C, No Airflow and No Heat Sink

Figure 10. Thermal Capture at 12VIN, 1.5VOUT at 13A and 1.2VOUT at 13A.

Ambient Temperature = 30°C, No Airflow and No Heat Sink

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DEMO MANUAL DC1498A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER, PART NUMBER

Required Circuit Components

1 4 CIN2, CIN3, CIN4, CIN5 Capacitor, X5R, 22µF, 25V, 10%,1210 Murata, GRM32ER61E226KE15

2 2 COUT1, COUT7 Capacitor, 470µF, 4V, POSCAP, F8 Sanyo, 4TPE470MCL

3 2 COUT4, COUT5 Capacitor, X5R, 100µF, 6.3V, 20% 1210 AVX, 12106D107MAT2A

4 3 R3, R22, R26 Resistor, Chip, 10k, 1%, 0603 NIC, NRC06F10R0TRF

5 1 R19 Resistor, Chip, 60.4k, 1%, 0603 Vishay, CRCW060360K4FKED

6 1 R25 Resistor, Chip, 40.2k, 1%, 0603 Vishay, CRCW060340K2FKED

7 1 R30 Resistor, Chip, 158k, 1%, 0603 Vishay, CRCW0603158KFKED

8 1 U1 LTM4620EV, 15mm × 15mm × 4.41mm LGA Linear Technology, LTM4620EV

Additional Demo Board Circuit Components

9 1 CIN1 Capacitor, 150µF, 25V, Aluminum Electr. Sun Electronics, 25CE150AX

10 0 COUT2, COUT3, COUT6, COUT8 Optional 1210

11 0 C1 Optional, 0805

12 1 C2 Capacitor, X7R, 1µF, 25V, 10%, 0805 AVX, 08053C105KAT2A

13 2 C5, C7 Capacitor, X5R, 0.1µF, 25V, 10%, 0603 AVX, 06033D104KAT

14 0 C3, C4, C6, C8-C12 Optional, 0603

15 2 C13, C14 Capacitor, X5R, 0.01µF, 50V, 10%, 0603 AVX, 06035C103KAT

16 2 C15, C16 Capacitor, X7R, 1µF, 10V, 10%, 0603 AVX, 0603ZC105KAT

17 1 Q1 N-Channel 30V MOSFET Vishay, SUD50N03-09P

18 1 R1 Resistor, Chip, 10k, 1%, 0603 NIC, NRC06F10R0TRF

19 0 R2, R4, R6, R8, R11, R14, R16, R17, R20 R23, R28, R31, R33, R39, R40 Optional, 0603

20 4 R5, R24, R27, R36 Resistor, Chip, 10k, 1%, 0603 Vishay, CRCW060310K0FKED

21 4 R7, R21, R29, R32 Resistor, Chip, 0k, 1%, 0603 Vishay, CRCW06030000Z0ED

22 5 R9, R12, R15, R18 Resistor, Chip, 60.4k, 1%, 0603 Vishay, CRCW060360K4FKED

23 2 R10, R13 Resistor, Chip, 6.04k, 1%, 0603 Vishay, CRCW06036K04FKED

24 1 R34 Resistor, Chip, 0Ω, 0.5W, 2010 Vishay, CRCW20200000Z0EF

25 0 R35 Optional, 2010

26 1 R37 Resistor, Chip, 0.015Ω, 2W, 2512 Vishay, WSL2512R0150FEA

27 0 R38 Optional, 2512

Hardware – For Demo Board Only

28 16 E1, E3-E10, E12-E16 Testpoint, Turret, 0.094" PBF Mill-Max, 2501-2-00-80-00-00-07-0

29 3 J1, J2, J3 Conn, BNC, 5 Pins Connex 112404

30 6 J4–J9 Jack Banana Keystone, 575-4

31 1 JP1 Header 4 Pin 0.079 Double Row Samtec, TMM104-02-L-D

32 1 JP6 Header 4 Pin 0.079 Single Row Samtec, TMM104-02-L-S

33 3 JP2, JP3, JP4 Header 3 Pin 0.079 Single Row Samtec, TMM103-02-L-S

34 1 JP5 Header 3 Pin 0.079 Double Row Samtec, TMM-103-02-L-D

35 6 XJP1–XJP6 Shunt, 0.079" Center Samtec, 2SN-BK-G

36 4 (Stand-Off) Stand-Off, Nylon 0.50" Keystone, 8833 (Snap On)

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DEMO MANUAL DC1498A

schematic Diagrams

D D

C C

B B

A A

VIN+

VIN-

VIN

GND

4.5V-16V

VOUT1

GND

VO1+

VO1-

1.5V @ 12A

1.2V @ 12A

GND

VO2-

VO2+

VOUT2

TRACK1

CLKOUT

PHASE

120

EXT.

SOFT-START

TRACK1 SEL.

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VOUT1

VIN INTVCC

VO1+

VO1-

INTVCC

VO1-

VO1+

INTVCC

VOUT1

VO2+

VO2-

VIN

INTVCC

DIFFP

COMP1

VFB1

DIFFN

DIFFOUT

VOUT1S

VOUT1

TRACK1

RUN1

VO2+

VOUT2

VO2-

VOUT2S RUN2

TRACK2

VFB2

COMP2

INTVCC

TEMP

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





















































 

 









TECHNOLOGY 























































E4E4

J6J6

R16

OPT

R16

OPT

J7J7

JP3

OFF

RUN2

JP3

OFF

RUN2

E15

TEMP

E15

TEMP

E7E7

COUT3

OPT

COUT3

OPT

C10

OPT

C10

OPT

R19

60.4K

R19

60.4K

0.1uF

J4J4

E1E1

CIN4

22uF

1210

25V

CIN4

22uF

1210

25V COUT2

OPT

COUT2

OPT

COUT6

OPT

COUT6

OPT

COUT1

470uF

COUT1

470uF

OPT

R10

6.04K

R10

6.04K

JP1

EXT_CLK

CCM

MODE

JP1

EXT_CLK

CCM

MODE

7 8

J5J5

R30

158K

R30

158K

J8J8

LTM4620EV

VIN J9

VIN J10

VIN J11

VIN K2

VIN K3

VIN K4

VIN K9

VIN K10

VIN K11

VIN

M10

VIN

M11

VIN L2

VIN L3

VIN L4

VIN L5

VIN L6

VIN L7

VIN L8

VIN L9

VIN

L10

VIN

L11

VIN J2

VIN J3

VIN J4

RUN1

TRACK1

VOUT1S

VOUT1

VFB1

SW1

PGOOD1

COMP1

DIFFOUT

DIFFN

DIFFP

FSET

PHASMD

GND

D10

GND

D11

GND

D12

GND

E10

GND

E11

GND

E12

GND

F10

GND

F11

GND

F12

GND

G10

GND

G12

GND

GND H3

GND H4

GND H5

GND H6

GND H7

GND H9

GND H10

GND H11

GND H12

GND J1

GND J5

GND J8

GND J12

GND K1

GND K5

GND K6

GND K7

GND K8

GND K12

GND L1

GND L12

GND M1

GND M12

SGND C7

SGND D6

SGND F6

SGND F7

SGND G6

SGND G7

VOUT1

COMP2 E7

PGOOD2 G8

SW2 G11

VFB2 D7

TRACK2 D8

RUN2 F9

VOUT2S C8

TEMP J6

MODE-PLLIN F4

CLKOUT G5

INTVCC H8

EXTVCC J7

VOUT2 A8

VOUT2 A9

VOUT2 A10

VOUT2 A11

VOUT2 A12

VOUT2 B8

VOUT2 B9

VOUT2 B10

VOUT2 B11

VOUT2 B12

VOUT2 C9

VOUT2 C10

VOUT2 C11

VOUT2 C12

GND

JP5

VOUT1

TRACK2 SEL.

JP5

VOUT1

TRACK2 SEL.

5 6

0.1uF

E12 PGOOD2

E13

EXTVCC

E13

EXTVCC

CIN3

22uF

25V

1210

CIN3

22uF

25V

1210

R15

60.4K

R15

60.4K

R32

OPT

E6E6

CIN2

22uF

25V

1210

CIN2

22uF

25V

1210

R21

COUT4

100uF

6.3V

COUT4

100uF

6.3V

E14

CLKOUT

E14

CLKOUT

COUT8

OPT

COUT8

OPT

R22

J9J9

1uF

R20

OPT

R20

OPT

E8E8

OPT

R24

10K

R24

10K

C12

OPT

C12

OPT

R27

10K

R27

10K

COUT7

470uF

COUT7

470uF

CIN5

22uF

25V

1210

CIN5

22uF

25V

1210

JP2

OFF

RUN1

JP2

OFF

RUN1

1 3

10K

OPT

C11

OPT

C11

OPT

JP6JP6

R18

60.4K

R18

60.4K

E10 TRACK2

60.4K

CIN1

150uF

25V

CIN1

150uF

25V

E9E9

TP1

SW1

TP1

SW1

R12

60.4K

R12

60.4K

OPT

PGOOD1

OPT

R26

JP4

SOFT-START

TRACK

JP4

SOFT-START

TRACK

E5E5

COUT5

100uF

6.3V

COUT5

100uF

6.3V

R13

6.04K

R13

6.04K

E16

CLKIN

E16

CLKIN

R29

TP2 SW2

R25

40.2K

R25

40.2K

OPT

dc1498afa

DEMO MANUAL DC1498A

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 Diagrams

D D

C C

B B

A A

OPTIONAL JUMPER FOR 1 OUTPUT CONFIGURATION

DIFF SENSING SELECTION

VOUT1

Load Transient Circuit

VOUT2

TEMP INTVCC

RUN1 RUN2

TRACK1 TRACK2

VFB1 VFB2

COMP1 COMP2

VO2- DIFFN

VO2+ DIFFP

VOUT1S VOUT1

VOUT2S DIFFOUT

VOUT1 VOUT2





 

 









TECHNOLOGY





























































 

 









TECHNOLOGY





























































 

 









TECHNOLOGY

























































E17

IOSTEP CLK

E17

IOSTEP CLK

R36

10K

R36

10K

R39

OPT

R39

OPT

R23

OPT

R23

OPT

IOSTEP

SUD50N03-09P

R35

OPT

2010

R35

OPT

2010

C13

0.01uF

C13

0.01uF

R14

OPT

R14

OPT

J1J1

R11

OPT

R11

OPT

C14

0.01uF

C14

0.01uF

E18

GND

E18

GND

R34

0 OHm

0.5W

2010

R34

0 OHm

0.5W

2010

R28

OPT

R28

OPT

R38

OPT

2512

R38

OPT

2512

R33

OPT

R33

OPT

R40

OPT

R40

OPT

C16

1uF

C16

1uF

R17

OPT

R17

OPT

R37

0.015

2512

R37

0.015

2512

J2J2

R31

OPT

R31

OPT

C15

1uF

C15

1uF

dc1498afa

DEMO MANUAL DC1498A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2012

LT 0413 REV A • 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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