Analog Devices DC2897A Quick setup guide

DEMO MANUAL

DC2897A

Rev. 0

DESCRIPTION

LTC7819

Low IQ, Triple Output

Synchronous Step-Down Supply

Demonstration circuit 2897A is a low IQ, triple output,

synchronous step-down supply featuring the LTC

7819.

The circuit is optimized for high efficiency. It provides

outputs of 3.3V at 12A, 8.5V at 10A and 5.0V at 12A over

an input voltage range of 10V to 36V with a switching

frequency of 380kHz. Each rail uses a 3mΩ sense resis-

tor to sense the current and provides optional footprints

for DCR sensing. Typical applications include automotive,

transportation, industrial, military and avionics systems.

Features of the DC2897A include pin selectable light

load operating modes of forced continuous mode,

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

BOARD PHOTO

pulse-skipping and Burst Mode

operation. Optional

spread spectrum modulation to reduce EMI, a PLLIN pin

to synchronize to an external clock, optional DCR sensing

footprints, an EXTVCC pin to reduce losses in the controller

and optional footprints to parallel two or three channels.

The LTC7819 data sheet provides a complete description

of the part, operational details, and applications infor-

mation. DC2897A must be read in conjunction with the

datasheet.

Design files for this circuit board are available.

DEMO MANUAL

DC2897A

Rev. 0

QUICK START PROCEDURE

Demonstration circuit 2897A is easy to setup for eval

uating the LTC7819. Please refer to Figure 1 for the

proper measurement equipment setup and follow the

procedurebelow.

1. Connect the input power supply to VIN (10V – 36V)

and GND (input return).

2. Preset the load for each output to 0A and the input

supply to 0V.

3. Place jumpers in the following positions:

JP4: RUN1 ON

JP2: RUN2 ON

JP1: RUN3 ON

JP3: MODE FCC

JP5: SPREAD SPECTRUM NO

4. Set the input voltage to within the speciﬁed range and

check VOUT1, VOUT2 and VOUT3.

5. Once the proper output voltages have been conﬁrmed,

observe the output voltage ripple, efﬁciency, and

otherparameters.

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range 10 36 V

Output Voltage #1, VOUT1 VIN = 10V to 36V, IOUT1 = 0A – 12A 3.3 V

Output Voltage #2, VOUT2 VIN = 10V to 36V, IOUT2 = 0A – 10A 8.5 V

Output Voltage #3, VOUT3 VIN = 10V to 36V, IOUT3 = 0A – 12A 5.0 V

Maximum Output Current, IOUT1 VIN = 10V to 36V, VOUT1 = 3.3V 12 A

Maximum Output Current, IOUT2 VIN = 10V to 36V, VOUT2 = 8.5V 10 A

Maximum Output Current, IOUT3 VIN = 10V to 36V, VOUT3 = 5.0V 12 A

Switching Frequency 380 kHz

Efficiency (fSW = 380kHz) VIN = 12V, VOUT1 = 3.3V, IOUT1 = 12A

VIN = 12V, VOUT2 = 8.5V, IOUT2 = 10A

VIN = 12V, VOUT3 = 5.0V, IOUT3 = 12A

94.9

97.9

96.4

LIGHT LOAD OPERATION, SYNCHRONIZATION TO AN

EXTERNAL CLOCK AND SPREAD SPECTRUM

To synchronize the LTC7819 to an external clock, place

the SPREAD SPECTRUM jumper (JP5) in the EXT CLK

position and apply an external clock between the PLLIN

turret and GND. The phase-lockable frequency range is

100kHz to 3MHz. The low clock level should be 0.5V or

lower and the high clock level should be 2.2V or higher.

For spread spectrum, place the jumper in the YES posi-

tion. With spread spectrum enabled, the frequency will be

modulated between 100% and 120% of the programmed

frequency (380kHz to 456kHz). This will help reduce the

peak emission levels. To allow the converter to free run

at is programmed frequency (380kHz), place the jumper

in the NO position which is the default setting.

Demonstration circuit 2897A can be programmed to

operate in either forced continuous conduction mode

(FCC), pulse-skipping mode (PS) or Burst Mode opera-

tion (BURST) at no load or light load with JP3. Forced

continuous mode (default setting) provides the clean-

est output voltage ripple. Pulse-skipping mode provides

higher efficiency at light load, but the output voltage ripple

is less regular. Burst Mode operation provides the highest

light load efficiency, but the output voltage ripple is the

least regular and highest of the three modes.

DEMO MANUAL

DC2897A

Rev. 0

OPTIONAL DCR SENSING

Demonstration circuit 2897A has optional footprints for

DCR sensing. The benefit of DCR sensing is a lower parts

count and high efficiency but at the expense of a less

accurate current sensing and current limit. To imple-

ment DCR sensing refer to Table1 and the Applications

Information section of the data sheet. Be sure to stuff a

0mΩ copper shunt or a short, thick piece of copper at

RS1, RS2 and/or RS3.

EXTVCC BIAS OPTION

The EXTV

pin of the LTC7819 on the standard demo

board is connected to the 5V output (VOUT3) to reduce

the losses in the controller and improve efficiency. If nec-

essary, the EXTVCC pin can be tied to an external supply

by following these steps:

1. Remove the 0Ω jumper at R20.

2. Connect a DC voltage from the EXTVCC turret to a GND

turret. The DC voltage should be between 5V and 30V.

PARALLELING CHANNELS

For higher power, two or more channels of demonstra-

tion circuit 2897A can be paralleled. Given that the chan-

nels operate 120 degrees out of phase with each other,

paralleling channels provides the benefit of ripple cur-

rent cancelation in the output and input capacitors. This

in turn provides lower output voltage and input voltage

ripple. Another benefit of interleaved channels is a faster

load step response. When paralleling phases channel 1

is always the master and channels 2 and 3 are slaves.

In addition, each phase should have the same inductor,

sense resistor–if used and MOSFETs. Detailed instruc-

tions are below:

Parallel Channel 1 with Channel 2:

nStuff 0Ω jumpers at R11, R12 and R15.

nStuff a 0mΩ jumper or short, thick piece of copper

atR19.

Parallel Channel 1 with Channel 3:

nStuff 0Ω jumpers at R10, R13 and R14.

nStuff a 0mΩ jumper or short, thick piece of copper

atR18.

Parallel Channel 1 with Channel 2 and Channel 3:

Stuff 0Ω jumpers at R11, R10, R12, R13, R15 and R14.

nStuff a 0mΩ jumper or short, thick piece of copper at

R19 and R18.

Notes

1. When measuring the output voltage or input voltage

ripple do not use the long ground lead on the oscillo-

scope probe. See Figure2 for the proper scope probe

technique. Short, stiff leads need to be soldered to the

(+) and (–) terminals of the output or input capacitor.

The probe’s ground ring needs to contact the (–) lead

and the probe tip needs to contact the (+) lead.

2. When powering the board, ﬁrst connect the input sup-

ply to the demo board as written above. Next, turn-on

the input supply. Do not hot plug. This could cause

large input voltage transients that may damage the

converter, especially at high VIN.

3. When using electronic loads which are rated to pro-

vide full current with a voltage of 0V, make sure the

load is off before turning off the rail. Otherwise, the

load could pull VOUT below ground. This may damage

theconverter.

QUICK START PROCEDURE

Table1. Optional Inductor DCR Sensing

CONFIGURATION

CHANNEL 1 RS1 R30 R29 C14 R45 R47 R61

CHANNEL 2 RS2 R52 R54 C56 R50 R49 R46

CHANNEL 3 RS3 R40 R39 C15 R51 R53 R62

RSENSE (DEFAULT) 3mΩ 0Ω 0Ω 1nF Open Open Open

DCR SENSING 0mΩ Cu Open Open Refer to Data Sheet 0Ω

DEMO MANUAL

DC2897A

Rev. 0

dc2897a F01

VOUT2

LOAD

IOUT2

–

VOUT1

LOAD +–

VOUT2

VOUT3

LOAD

IOUT3

VOUT3

–

IIN

IOUT1

–

VOUT1

VIN SUPPLY

–

VIN

NOTE FOR ACCURATE EFFICIENCY MEASUREMENTS:

MONITOR VOUT1, VOUT2 AND VOUT3 ACROSS COUT1, COUT7 AND COUT4, RESPECTIVELY.

MONITOR VIN ACROSS EITHER CIN7 (CH1), CIN9 (CH2) OR CIN5 (CH3).

Figure1. Proper Measurement Equipment Setup

+ –

VOUT GND

COUT

dc2897a F02

Figure2. How to Measure the Output or Input Voltage Ripple

QUICK START PROCEDURE

DEMO MANUAL

DC2897A

Rev. 0

QUICK START PROCEDURE

Figure3. Efficiency of the 3.3V/12A Rail (VOUT1) Over the

Input Voltage Range, the Other Two Rails Were Disabled, No

Voltage Was Applied to the EXTVCC Pin and the PGOOD Pull-Ups

WereRemoved

Figure4. Efficiency of the 8.5V/10A Rail (VOUT2) Over the

Input Voltage Range, the Other Two Rails Were Disabled, No

Voltage Was Applied to the EXTVCC Pin and the PGOOD Pull-Ups

WereRemoved

Figure5. Efficiency of the 5V/12A Rail (VOUT3) Over the Input

Voltage Range, the Other Two Rails Were Disabled, the 5V Output

was Tied to the EXTVCC Pin and the PGOOD Pull-Ups Were Removed

= 380kHz

MODE = FCM

= 12V

= 24V

= 36V

LOAD CURRENT (A)

100

EFFICIENCY (%)

dc2897a F03

Efficiency, VOUT = 3.3V

= 380kHz

MODE = FCM

= 12V

= 24V

= 36V

LOAD CURRENT (A)

100

EFFICIENCY (%)

dc2897a F04

Efficiency, VOUT = 8.5V

= 380kHz

MODE = FCM

= 12V

= 24V

= 36V

LOAD CURRENT (A)

100

EFFICIENCY (%)

dc2897a F05

Efficiency, VOUT = 5V

DEMO MANUAL

DC2897A

Rev. 0

QUICK START PROCEDURE

Figure6. Efficiency of the 3.3V/12A Rail (VOUT1) at 12VIN for the

Three Light Load Operating Modes, the Other Two Rails Were

Disabled, No Voltage Was Applied to the EXTVCC Pin and the

PGOOD Pull-Ups Were Removed

Figure8. Efficiency of the 5V/12A Rail (VOUT3) for the Three Light

Load Operating Modes, the Other Two Rails Were Disabled, the

5V Output Was Tied to the EXTVCC Pin and the PGOOD Pull-Ups

Were Removed

= 380kHz

Burst Mode

PULSE SKIP

FCM

LOAD CURRENT (A)

0.001

0.01

0.1

100

EFFICIENCY (%)

dc2897a F07

= 380kHz

Burst Mode

PULSE SKIP

FCM

LOAD CURRENT (A)

0.001

0.01

0.1

100

EFFICIENCY (%)

dc2897a F08

= 380kHz

Burst Mode

PULSE SKIP

FCM

LOAD CURRENT (A)

0.001

0.01

0.1

100

EFFICIENCY (%)

dc2897a F06

Efficiency, VOUT = 3.3V, VIN = 12V

Figure7. Efficiency of the 8.5V/10A Rail (VOUT2) at 12VIN for the

Three Light Load Operating Modes, the Other Two Rails Were

Disabled, No Voltage Was Applied to the EXTVCC Pin and the

PGOOD Pull-Ups Were Removed

Efficiency, VOUT = 8.5V, VIN = 12V

Efficiency, VOUT = 5V, VIN = 12V

DEMO MANUAL

DC2897A

Rev. 0

Figure9. Thermal Image with Full Load on Each Rail at 12VIN,

fSW = 380kHz, No Airflow, TA= 23°C, Markers Show the Hot Spot

for Each Channel

Figure10. Thermal Image with Full Load on Each Rail at 36VIN,

fSW = 380kHz, No Airflow, TA= 23°C, Markers Show the Hot Spot

for Each Channel

Figure11. 50% to 100% Load Step Response of the 3.3V/12A

Rail (VOUT1)

Figure12. 50% to 100% Load Step Response of the 8.5V/10A

Rail (VOUT2)

Figure13. 50% to 100% Load Step Response of the

5.0V/12A Rail (VOUT3)

50µs/DIV

dc2897a F11

VOUT (AC)

100mV/DIV

LOAD

CURRENT

5A/DIV

100µs/DIV

dc2897a F12

VOUT (AC)

200mV/DIV

LOAD

CURRENT

5A/DIV

50µs/DIV

VOUT (AC)

100mV/DIV

LOAD

CURRENT

5A/DIV

dc2897a F13

QUICK START PROCEDURE

DEMO MANUAL

DC2897A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 5 C1, C14, C15, C43, C56 CAP., 1000pF, C0G, 50V, 10%, 0603 AVX, 06035A102KAT2A

2 1 C11 CAP., 4.7μF, X5R, 10V, 10%, 0805 KEMET, C0805C475K8PACTU

MURATA, GRM21BR61A475KA73L

SAMSUNG, CL21A475KPFNNNF

TDK, C2012X5R1A475K125AA

3 8 C2, C4, C20, C21, C47, C52,

C61, C74

CAP., 0.1μF, X7R, 50V, 10%, 0603 AVX, 06035C104KAT2A

KEMET, C0603C104K5RAC7867; C0603C104K5RACTU

TDK, C1608X7R1H104K080AA

4 1 C41 CAP., 2200pF, X7R, 50V, 10%, 0603 AVX, 06035C222KAT2A

MURATA, GRM188R71H222KA01D

SAMSUNG, CL10B222KB8NFNC

5 2 C42, C44 CAP., 47pF, X7R, 50V, 10%, 0603 AVX, 06035C470KAT2A

KEMET, C0603C470K5RACTU

6 1 C53 CAP., 0.01μF, C0G, 50V, 5%, 0603 MURATA, GRM1885C1H103JA01D

TDK, C1608C0G1H103J080AA

7 1 C54 CAP., 220pF, X7R, 50V, 10%, 0603 AVX, 06035C221KAT2A

KEMET, C0603C221K5RACTU

NIC, NMC0603X7R221K50TRPF

8 2 C69, C70 CAP., 1μF, X7R, 10V, 10%, 0603 AVX, 0603ZC105KAT2A

KEMET, C0603C105K8RACTU

MURATA, GRM188R71A105KA61D

TDK, C1608X7R1A105K080AC

9 1 CIN1 CAP., 220μF, ALUM ELECT, 50V, 20%,

10mm × 10.2mm, RADIAL, SMD,

AEC-Q200

PANASONIC, EEEFK1H221GP

CORNELL DUBILIER, AFK227M50G24T-F

10 8 CIN3, CIN4, CIN5, CIN6,

CIN7, CIN8, CIN9, CIN10

CAP., 4.7μF, X7R, 50V, 10%, 1210 AVX, 12105C475KAT2A

KEMET, C1210C475K5RACTU

MURATA, GRM32ER71H475KA88L

YAGEO, CC1210KKX7R9BB475

11 6 COUT1, COUT2, COUT4,

COUT5, COUT7, COUT8

CAP., 47μF, X7R, 10V, 10%, 1210 AVX, 1210ZC476KAT2A

MURATA, GRM32ER71A476KE15L

TAIYO YUDEN, LMK325B7476KM-PR; LMK325B7476KM-TR

12 2 COUT10, COUT11 CAP., 470μF, TANT, POSCAP, 6.3V, 20%,

7343, 10mΩ, TCF

PANASONIC, 6TCF470MAH

13 1 COUT12 CAP., 150μF, TANT. POSCAP, 10V, 20%,

7343, D3L

PANASONIC, 10TPF150ML

14 3 D1, D2, D6 DIODE, SCHOTTKY, 100V, 1A,

POWERDI-123, AEC-Q101

DIODES INC., DFLS1100Q-7

15 2 L1, L3 IND., 2.2μH, PWR., 20%,

11.8mm × 10.5mm SMD, AEC-Q200

COILCRAFT, XAL1010-222MEB; XAL1010-222MED

16 1 L2 IND., 3.3μH, PWR., 20%, 25A, 4.10mΩ,

11.8mm × 10.5mm, XAL1010, AEC-Q200

COILCRAFT, XAL1010-332MEB; XAL1010-332MED

17 3 Q1, Q3, Q5 XSTR., MOSFET, N-CH, 40V, 59A,

TDSON-8 FL

INFINEON, BSC059N04LS6; BSC059N04LS6ATMA1

18 3 Q2, Q4, Q6 XSTR., MOSFET, N-CH, 40V, 100A,

TDSON-8 FL

INFINEON, BSC022N04LS6; BSC022N04LS6ATMA1

19 16 R1, R3, R4, R5, R9, R25,

R27, R29, R30, R39, R40,

R44, R52, R54, R83, R84

RES., 0Ω, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA; CRCW06030000Z0EB

NIC, NRC06ZOTRF

DEMO MANUAL

DC2897A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

20 1 R20 RES., 0Ω, 1/4W, 1206, AEC-Q200 VISHAY, CRCW12060000Z0EA

PANASONIC, ERJ8GEY0R00V

NIC, NRC12ZOTRF

21 3 R26, R38, R55 RES., 1M, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F1004TRF

PANASONIC, ERJ3EKF1004V

VISHAY, CRCW06031M00FKEA

22 1 R31 RES., 10k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF1002V

VISHAY, CRCW060310K0FKEA; CRCW060310K0FKEB

KOA SPEER, RK73H1JTTD1002F

23 2 R33, R35 RES., 20k, 1%, 1/10W, 0603 NIC, NRC06F2002TRF

VISHAY, CRCW060320K0FKEA

PANASONIC, ERJ3EKF2002V

YAGEO, RC0603FR-0720KL

24 1 R43 RES., 105k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603105KFKEA

NIC, NRC06F1053TRF

25 1 R57 RES., 133k, 1%, 1/10W, 0603 BOURNS, CR0603-FX-1333ELF

YAGEO, RC0603FR-07133KL

26 1 R58 RES., 13.7k, 1%, 1/10W, 0603,

AEC-Q200

VISHAY, CRCW060313K7FKEA

PANASONIC, ERJ3EKF1372V

27 1 R6 RES., 1k, 5%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3GEYJ102V

28 1 R60 RES., 4.99k, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF4991V

YAGEO, RC0603FR-074K99L

29 4 R7, R34, R37, R63 RES., 100k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603100KFKEA

NIC, NRC06F1003TRF

PANASONIC, ERJ3EKF1003V

30 3 R8, R36, R59 RES., 10Ω, 1%, 1/10W, 0603 VISHAY, CRCW060310R0FKEA

NIC, NRC06F10R0TRF

PANASONIC, ERJ3EKF10R0V

ROHM, MCR03EZPFX10R0

YAGEO, RC0603FR-0710RL

31 3 RS1, RS2, RS3 RES., 0.003, 0Ω, 1%, 2W, 2010 LONG-

SIDE TERM, METAL, SENSE, AEC-Q200

SUSUMU, KRL5025E-C-R003-F-T1

32 1 U1 IC, SYN. STEP-DOWN CONVERTER,

40-PIN QFN

ANALOG DEVICES, LTC7819RUJ#PBF; LTC7819RUJ#TRPBF

Additional Circuit Components

1 0 C38, C48, C60, C62, C63,

C64, C65, C66, C67, C68,

C71, C72, C73

CAP., OPTION, 0603

2 0 CIN2 CAP., OPTION, ALUM. ELECT., SMD

3 0 COUT13, COUT14, COUT15 CAP., OPTION, 1210

4 0 COUT3, COUT6, COUT9 CAP., OPTION, 7343

5 0 Q7, Q10, Q11, Q12, Q13, Q14 XSTR., OPTION, MOSFET N-CH,

PG-TDSON-8

6 0 R18, R19 RES., OPTION, 2010

7 0 R2, R10, R11, R12, R13,

R14, R15, R21, R22, R23,

R28, R32, R41, R42, R45,

R46, R47, R49, R50, R51,

R53, R56, R61, R62

RES., OPTION, 0603

DEMO MANUAL

DC2897A

Rev. 0

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Hardware: For Demo Board Only

1 19 E1, E2, E3, E4, E5, E6, E7,

E8, E9, E10, E11, E12, E13,

E14, E15, E16, E17, E18, E19

TEST POINT, TURRET, 0.094" MTG.

HOLE, PCB 0.062" THK

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

2 8 J1, J2, J3, J4, J5, J6, J7, J8 CONN., BANANA JACK, FEMALE, THT,

NON-INSULATED, SWAGE, 0.218"

KEYSTONE, 575-4

3 3 JP1, JP2, JP4 CONN., HDR, MALE, 1×3, 2mm, VERT,

ST, THT, NO SUBS. ALLOWED

WURTH ELEKTRONIK, 62000311121

4 2 JP3, JP5 CONN., HDR, MALE, 2×3, 2mm, VERT,

ST, THT

WURTH ELEKTRONIK, 62000621121

5 8 MP1, MP2, MP3, MP4,

MP5, MP6, MP7, MP8

STANDOFF, NYLON, SNAP-ON, 0.625"

(5/8"), 15.9mm

KEYSTONE, 8834

6 3 XJP1, XJP2, XJP4 CONN., SHUNT, FEMALE, 2-POS, 2mm WURTH ELEKTRONIK, 60800213421

PARTS LIST

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