Linear Technology DC2111A-A/B Guida rapida alla configurazione

dc2111aabf

DEMO MANUAL

DC2111A-A/B

Description

LTC3774EUHE

4-Phase High Current Step-Down Converter

with Very Low DCR Inductor

Demonstration circuit DC2111A features the LT C

3774 in

a 4-phase, high output current step-down converter with

sub-mΩ DCR sensing. This high performance converter

operates at a switching frequency of 400kHz over an input

voltage range of 10V to 14V. The 5mm × 5mm DrMOS

and 0.33µH/0.325mΩ inductor provide high efficiency

while supplying 30A per phase. The board comes in two

assembly types. The –A assembly provides a 1.2V/90A

converter with N+1 MOSFET failure protection and the –B

assembly provides a high efficiency 1.2V/120A converter.

1.2V/90A Converter with N+1 MOSFET Failure

Protection

The –A assembly is intended for high reliability applica-

tions which have a very low tolerance for down-time or

which operate in rugged environments. Each phase of the

1.2V/90A converter is protected by its own LTC4226-1

hot swap circuit on the input and an LTC4352 ideal diode

on its output. If an internal DrMOS MOSFET fails, then

that phase will be isolated from the rest of the circuit and

the converter will continue to operate with only a small

perturbation on the output and will provide the full rated

90A load. Once a fault is detected, the PWM signal for that

phase will be floated. This in turn will signal the DrMOS to

pull its TG and BG signals low. Examples of the converter’s

response to MOSFET failures can be seen in Figure 2 and

Figure 3. Further protection is provided by a dedicated 5V

bias supply for each phase. If the 5V bias for a given phase

is pulled down due to a DrMOS failure or other fault, the

5V bias for the other phases will not be affected.

In case of an overvoltage event, an external overvoltage

protection circuit will pull down the output. The LTC3774

does have its own crowbar type overvoltage protection, L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

but the ideal diodes will prevent the bottom FETs from

pulling down the output once an overvoltage is detected.

The external OVP comparator will also provide overvolt-

age protection in case the voltage sense lines are shorted

or reversed.

For a 12V input, the –A assembly provides a full load ef-

ficiency of 89.3% and a peak efficiency of 90.6% which

occurs around 50% load.

1.2V/120A High Efficiency Converter

The –B assembly is a high efficiency 1.2V/120A 4-phase

converter. Given that it does not have the MOSFET failure

protection and redundancy of the –A assembly, it provides

higher efficiency and more output current. For a 12V input

it provides a full load efficiency of 90.6% and a peak ef-

ficiency of 93.1% which occurs at 55% load.

More Features

Bothassemblytypesprovidemanyfeatures.Theseinclude:

•Remote sensing

•CLKIN and CLKOUT pins

•PGOOD, RUN and TRACK/SS pins

•Dynamic load circuit

•Optional phase shedding circuit

The LTC3774 data sheet provide a complete description

of the IC operation and application information. The data

sheet must bereadinconjunctionwiththequickstartguide.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2111A-A/-B

dc2111aabf

DEMO MANUAL

DC2111A-A/-B

performance summary

Specifications are at TA= 25°C

Table 1. A Converter (TA= 25°C, No Airflow)

PARAMETER CONDITION VALUE

Minimum Input Voltage 10V

Maximum Input Voltage 14V

Output Voltage VOUT IOUT = 0A to 90A, VIN = 10V to 14V 1.2V ± 1.5%

IOUT(MAX) VIN = 10V to 14V 90A

Nominal Switching Frequency 400kHz

Efficiency, See Figure 6 VOUT = 1.2V, IOUT = 90A, VIN = 12V 89.3% Typical

Table 2. B Converter (TA = 25°C, No Airflow)

PARAMETER CONDITION VALUE

Minimum Input Voltage 10V

Maximum Input Voltage 14V

Output Voltage VOUT IOUT = 0A to 120A, VIN = 10V to 14V 1.2V ± 1.5%

IOUT(MAX) VIN = 10V to 14V 120A

Nominal Switching Frequency 400kHz

Efficiency, See Figure 7 VOUT = 1.2V, IOUT = 120A, VIN = 12V 90.6% Typical

dc2111aabf

DEMO MANUAL

DC2111A-A/B

Quick start proceDure

The evaluation setup for demonstration circuit 2111A is

shown in Figure 1. To test the board, follow the procedure

below:

1) With power off, connect the input supply, load and

meters as shown in the setup drawings. Preset the load

to 0A and VIN supply to be 0V.

2) Place the jumpers in the following positions:

JP1 RUN ON

JP2 MODE CCM

JP5 IDEAL DIODE

MODE

DIODE A ONLY

3) Set the input voltage to 12V.

4) Check the output voltage. The output voltage should be

within the regulation limits shown in the Performance

Summary table.

5) Next, apply full load and re-measure VOUT. Check the

output voltage again to make sure it is within the regula-

tion limits.

6) Adjust the input voltage and load current to the desired

levels within their limits and observe the regulation,

output ripple, load step response, efficiency and other

parameters.

Note 1. To monitor the output voltage ripple, use the BNC

connectors labeled VOUT.

Note 2. Do not connect load between the VOS+ and VOS–

turrets. This could damage the converter. Only apply load

across the VOUT+ and VOUT–stud connectors on the

edge of the board.

Note 3. For loads less than 5A, some low level noise may

appear on the output of the –A assembly. This is due to the

normal operation of the ideal diodes and the slight current

sharing discrepancy between the phases. To avoid this,

place the DIODE jumper in the REV I ALLOWED setting.

This will allow reverse current to flow through the diodes

for clean output voltage ripple. However, the output will

not be protected from faults which short the switch node

to ground.

Dynamic Load Circuit (Optional)

Demonstration circuit 2111A provides a simple dynamic

load circuit consisting of a MOSFET and sense resistor.

To use the circuit, follow the steps below:

1. Connect the output of the pulse generator between

PULSE GEN and GND.

2. Connect the BNC labeled LOAD STEP toan oscilloscope.

3. Connect the BNC labeled VOUT to an oscilloscope.

4. Preset the amplitude of a pulse generator to 0V and

the duty cycle to 5% or less.

5. With the converter running, slowly increase the am-

plitude of the pulse generator output to provide the

desired load step pulse height. The scaling for the load

step signal is 2mV/A.

dc2111aabf

DEMO MANUAL

DC2111A-A/-B

Quick start proceDure

VIN

SUPPLY

VIN

IIN

–

+ –

VOUT

–

+ –

IOUT

VOUT

dc2111aab F01

COUT3

Figure 1. Proper Measurement Equipment Setup for DC2111A-A/-B

dc2111aabf

DEMO MANUAL

DC2111A-A/B

Quick start proceDure

Figure 3. 1.2V/90A Converter with N+1 MOSFET Failure Protection. Bottom MOSFET of Phase 1

Shorted Drain to Source with Full Load on the Output and a 12V input. The Output Continues to

Regulate with Only a Small Perturbation on the Output.

Figure 2. 1.2V/90A Converter with N+1 MOSFET Failure Protection. Top MOSFET of Phase 4 Shorted

Drain to Source with Full Load on the Output and a 12V Input. The Output Continues to Regulate with

Only a small Perturbation on the Output.

VOUT (AC)

50mV/DIV

VIN4

10V/DIV

HiZB4

5V/DIV

PWM4

5V/DIV

VSW1

10V/DIV

VSW2

10V/DIV

VSW3

10V/DIV

VSW4

10V/DIV

50µs/DIV dc2111aab F02

VOUT (AC)

50mV/DIV

VIN1

10V/DIV

HiZB1

5V/DIV

PWM1

5V/DIV

VSW1

10V/DIV

VSW2

10V/DIV

VSW3

10V/DIV

VSW4

10V/DIV

50µs/DIV dc2111aab F03

dc2111aabf

DEMO MANUAL

DC2111A-A/-B

Quick start proceDure

VOUT(AC)

100mV/DIV

LOAD STEP

20A/DIV

50µs/DIV dc2111aab F04

45A

90A

VOUT(AC)

100mV/DIV

LOAD STEP

20A/DIV

50µs/DIV dc2111aab F05

60A

120A

Figure 4. 45A to 90A Load Step Response of the 1.2V/90A Converter with N+1 MOSFET Failure

Protection Circuit. VIN = 12V.

Figure 5. 60A to 120A Load Step Response of the 1.2V/120A High Efficiency Converter. VIN = 12V.

dc2111aabf

DEMO MANUAL

DC2111A-A/B

Quick start proceDure

EFFICIENCY (%)

LOAD CURRENT (A)

40 60 80 100200

dc2111aab F06

10VIN

12VIN

14VIN

EACH PHASE:

DrMOS = FDMF5820DC, BOOST R = 0Ω

L = WURTH 744301033 (0.33µH, 0.32mΩ)

HOT SWAP CIRCUIT: LTC4226-1 WITH FDMS86500DC

IDEAL DIODES: LTC4352 WITH BSC010NE2LS

DrMOS BIAS = 5.6V

BIAS POWER INCLUDED IN EFFICIENCY MEASUREMENT

EFFICIENCY (%)

LOAD CURRENT (A)

100

40 60 80 100 120 140200

dc2111aab F07

EACH PHASE:

DrMOS = FDMF5820DC, BOOST R = 0Ω

L = WURTH 744301033 (0.33µH, 0.32mΩ)

DrMOS BIAS = 5.6V

BIAS POWER INCLUDED IN EFFICIENCY MEASUREMENT

10VIN

12VIN

14VIN

Figure 6. Efficiency Curves for the 1.2V/90A Converter with N+1 MOSFET Failure Protection. No Airflow.

Figure 7. Efficiency Curves for the 1.2V/120A High Efficiency Converter. No Airflow.

dc2111aabf

DEMO MANUAL

DC2111A-A/-B

PHASE 2 PHASE 3 PHASE 4PHASE 1

IDEAL DIODES

INDUCTORS

DrMOS

HOT SWAP

dc2111aab F08

VIN

VOUT

PHASE 2 PHASE 3 PHASE 4PHASE 1

INDUCTORS

DrMOS

dc2111aab F08

VIN

0mΩ JUMPERS

VOUT

Quick start proceDure

Figure 8. Thermal Image of the 1.2V/90A Converter with N+1 MOSFET Failure Protection.

Measured with Full Load and an Input Voltage of 12V. TAMB = 21°C. Hot Spot is the DrMOS of

Phases 2 with a Rise Over Ambient of 50°C.

Figure 9. Thermal Image of the 1.2V/90A Converter with N+1 MOSFET Failure Protection.

Measured with Full Load and an Input Voltage of 12V. TAMB = 21°C. Hot Spot is the DrMOS of

Phases 2 with a Rise Over Ambient of 50°C.

dc2111aabf

DEMO MANUAL

DC2111A-A/B

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 9 C1, C6, C18, C20, C27, C30, C41, C43,

C66

CAP, 2.2µF 10% 16V X5R 0603 MURATA, GRM188R61C225KE15D

2 1 C10 CAP, 4.7nF, 5%, 25V, X7R 0603 AVX, 06033C472JAT2A

3 4 C11, C24, C33, C45 CAP, 1µF 20% 25V X5R 0603 AVX, 06033D105MAT2A

4 2 C15, C37 CAP, 4.7µF 20% 10V X5R 0805 AVX, 0805ZD475MAT2A

5 2 C17, C39 CAP, 1µF 20% 25V X5R 0603 AVX, 06033D105MAT2A

6 12 C2, C12, C13, C14, C16, C19, C28, C34,

C35, C36, C38, C40

CAP, 0.22µF 10% 25V X7R 0603 AVX, 06033C224KAT2A

7 4 C23, C25, C46, C47 CAP, 100pF 10% 25V NPO 0603 AVX, 06033A101KAT2A

8 1 C4 CAP, 47pF 5% 50V NPO 0603 AVX, 06035A470JAT2A

9 4 C5, C21, C29, C42 CAP, 0.1µF 10% 25V X7R 0603 AVX, 06033C104KAT2A

10 1 C50 CAP, 10µF 20% 6.3V X5R 0805 AVX, 08056D106MAT2A

11 1 C73 CAP, 0.1µF 10% 25V X7R 0603 AVX, 06033C104KAT2A

12 2 C8, C32 CAP, 330pF 10% 25V NPO 0603 AVX, 06033A331KAT2A

13 1 C9 CAP, 0.01µF 10% 25V X7R 0603 AVX, 06033C103KAT2A

14 8 CIN1, CIN2, CIN3, CIN4, CIN8, CIN9,

CIN11, CIN12

CAP, 22µF, 10%, 16V, X5R, 1210 MURATA, GRM32ER61C226KE20L

15 2 CIN5, CIN10 CAP, 22µF 10% 16V X5R 1210 MURATA, GRM32ER61C226KE20L

16 2 CIN6, CIN7 CAP, 150µF, 25%, 25V, ALUM CORPORATION, 25HVH150M

17 8 COUT1, COUT2, COUT9, COUT10,

COUT11, COUT12, COUT19, COUT20

CAP, 100µF 20% 6.3V X5R 1206 MURATA, GRM31CR60J107ME39L

18 12 COUT3, COUT4, COUT5, COUT6,

COUT7, COUT8, COUT13, COUT14,

COUT15, COUT16, COUT17, COUT18

CAP, 330µF 20% 2.5V POSCAP 7343 PANASONIC, 2R5TPE330M9

19 9 D1, D2, D3, D4, D6, D8, D11, D13, D18 DIODE, 1N4448HWT SOD523 DIODES INC, 1N4448HWT-7

20 2 D5, D10 DIODE, CMHZ4701 SOD123 CENTRAL SEMI, CMHZ4701

21 2 D7, D12 DIODE, CMHZ4683 SOD123 CENTRAL SEMI, CMHZ4683

22 1 D9 DIODE, SMAJ17A SMA-DIODE DIODE INC, SMAJ17A-13-F

23 4 L1, L2, L3, L4 IND, 0.33µH 20% WURTH ELEKTRONIK 744301033

24 4 Q1, Q2, Q5, Q6 MOSFET, BSC010NE2LS LFPAK INFINEON, BSC010NE2LS

25 4 Q3, Q4, Q7, Q8 MOSFET, FDMS86500DC POWER56 FAIRCHILD, FDMS86500DC

26 1 R1 RES, 100k 1% 1/10W 0603 VISHAY, CRCW0603100KFKEA

27 4 R12, R40, R61, R84 RES, 24.9k 1% 1/10W 0603 VISHAY, CRCW060324K9FKEA

28 10 R13, R42, R45, R62, R86, R91, R112,

R180, R181, R182

RES, 0Ω JUMPER 0603 VISHAY, CRCW06030000Z0EA

29 1 R154 RES, 2k 5% 1/4W 1206 VISHAY, CRCW12062K00JNEA

30 1 R16 RES, 1.69k 1% 1/10W 0603 VISHAY, CRCW06031K69FKEA

31 4 R18, R29, R65, R72 RES, 4.64k 1% 1/10W 0603 VISHAY, CRCW06034K64FKEA

32 4 R183, R184, R185, R186 RES, 100Ω 1% 1/16W 0603 VISHAY, CRCW0603100RFKEA

33 1 R187 RES, 100Ω 1% 1/10W 0805 VISHAY, CRCW0805100RFKEA

34 1 R19 RES, 30.1k 1% 1/10W 0603 VISHAY, CRCW060330K1FKEA

35 1 R2 RES, 56.2k 1% 1/10W 0603 VISHAY, CRCW060356K2FKEA

36 4 R20, R27, R66, R73 RES, 931Ω 1% 1/10W 0603 VISHAY, CRCW0603931RFKEA

dc2111aabf

DEMO MANUAL

DC2111A-A/-B

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

37 2 R23, R69 RES, 37.4k 1% 1/10W 0603 VISHAY, CRCW060337K4FKEA

38 2 R24, R34 RES, 10Ω 1% 1/10W 0603 VISHAY, CRCW060310R0FKEA

39 4 R3, R32, R56, R78 RES, 1Ω 1% 1/10W 0603 VISHAY, CRCW06031R00FKEA

40 2 R30, R75 RES, 2.2Ω 1% 1/10W 0603 VISHAY, CRCW06032R20FKEA

41 2 R37, R82 RES, 30.1k 1% 1/10W 0603 VISHAY, CRCW060330K1FKEA

42 2 R39, R83 RES, 2.4M 1% 1/10W 0603 VISHAY, CRCW06032M40FKEA

43 18 R4, R10, R15, R21, R28, R31, R33,

R48, R50, R57, R63, R67, R68, R74,

R76, R77, R93, R95

RES, 0Ω JUMPER 0603 VISHAY, CRCW06030000Z0EA

44 2 R41, R85 RES, 38.3k 1% 1/10W 0603 VISHAY, CRCW060338K3FKEA

45 2 R44, R88 RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA

46 18 R5, R6, R7, R9, R11, R17, R22, R35,

R36, R46, R52, R58, R60, R79, R80,

R89, R96, R104

RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA

47 1 R64 RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA

48 4 RS1, RS2, RS3, RS4 RES, 0.007Ω, 1% 1W 2512 VISHAY, WSL25127L000FEA

49 4 U1, U4, U7, U10 MOSFET, DrMOS DC-DC 2MHz QFN-5X5-31 FAIRCHILD, FDMF5820DC

50 4 U2, U5, U8, U11 IC, LTC4352CDD DFN12DD LINEAR TECHNOLOGY, LTC4352CDD#PBF

51 2 U3, U9 IC, LTC3774EUHE UHE-5X6-36P+1 LINEAR TECHNOLOGY, LTC3774EUHE#PBF

52 2 U6, U12 IC, LTC4226CUD-1 QFN16UD-3X3 LINEAR TECHNOLOGY,LTC4226CUD-1#PBF

Bias Supplies

1 1 C66 CAP, 2.2µF 10% 16V X5R 0603 MURATA, GRM188R61C225KE15D

2 2 C52, C57 CAP, 1µF 10% 25V X5R 0805 AVX, 08053D105KAT2A

3 4 C53, C54, C61, C64 CAP, 10µF 20% 6.3V X5R 0805 AVX, 08056D106MAT2A

4 4 C55, C56, C62, C63 CAP, 0.01µF 10% 25V NPO 0603 AVX, 06033C103KAT2A

5 4 R114, R115, R127, R128 RES, 0Ω JUMPER 0603 VISHAY, CRCW06030000Z0EA

6 4 R116, R117, R130, R131 RES, 1M 5% 1/16W 0603 VISHAY, CRCW06031M00JNEA

7 4 R122, R123, R133, R134 RES, 255k 1% 1/10W 0603 VISHAY, CRCW0603255KFKEA

8 4 R125, R126, R137, R138 RES, 73.2k 1% 1/10W 0603 VISHAY, CRCW060373K2FKEA

9 2 U15, U16 IC, LT3027EDD DFN10DD LINEAR TECHNOLOGY, LT3027EDD#PBF

Overvoltage Comparator

1 1 R129 RES, 0Ω JUMPER 0603 VISHAY, CRCW06030000Z0EA

2 2 C58, C59 CAP, 1µF 20% 25V X5R 0603 AVX, 06033D105MAT2A

3 1 U17 IC, LT6656BIS6-25 SOT6 LINEAR TECHNOLOGY, LT6656BIS6-2.5#PBF

4 1 R136 RES, 931k 1% 1/10W 0603 VISHAY, CRCW06039K31FKEA

5 1 R140 RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA

6 1 R132 RES, 1k 1% 1/10W 0603 VISHAY, CRCW06031K0FKEA

7 1 R135 RES, 100k 1% 1/10W 0603 VISHAY, CRCW0603100KFKEA

8 1 R178 RES, 10k 1% 1/10W 0603 VISHAY, CRCW060310K0FKEA

9 1 C65 CAP, 1µF 20% 25V X5R 0603 AVX, 06033D105MAT2A

parts List

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