Linear DC2002A Kurzanleitung zur Einrichtung

dc2002af

DEMO MANUAL DC2002A

Description

LTC3774EUHE

High Efficiency Dual Output Step-Down

Converter with Very Low DCR Inductor

Demonstration circuit DC2002A is a dual output synchro-

nous buck converter featuring the LTC3774EUHE. The

demoboardsuppliestworailsof1.5V/30Aand1.2V/30A.

Thepowerstageforeachrailconsistsofa0.33µH0.32mΩ

DCR inductor with a 11mm ×11mm footprint and a

6mm ×6mm DrMOS driven by the PWM outputs of the

LTC3774EUHE at a switching frequency of 400kHz. The

inductor, DrMOS and the local ceramic input and output

capacitors forms the core converter which occupies a

1.1˝ ×1.1˝ area on the top layer. The control circuit is

directly underneath on the bottom layer and occupies an

area of 0.9˝ ×1.1˝. The result is a two sided core converter

with a current density of 50A per square inch and a full

load efficiency of 91.1% for the 1.5V rail and 90.0% for

the 1.2V rail.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap

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

respective owners.

performance summary

Additional features of this demo board include:

• Remote Sensing for Each Output

• PLLIN and CLKOUT Pins

• PGOOD, RUN and TRK/SS Pins for Each Output

• Optional Resistors to Tie the Tw o Outputs Together

• Optional Footprint for Hot Swap™FET on the Input of

Each Phase for MOSFET Failure Protection

• Optional Footprint for an LTC4449 Gate Driver and

Discrete MOSFETs

• Optional Footprint for a Dual Phase Delta Power Block

Design files for this circuit board are available at

http://www.linear.com/demo/DC2002A

PARAMETER CONDITIONS VALUE

Minimum Input Voltage 7V

Maximum Input Voltage 14V

Output Voltage VOUT1 IOUT1 = 0A TO 30A, VIN = 7V to 14V 1.5V ±2%

Output Voltage VOUT2 IOUT2 = 0A TO 30A, VIN = 7V to 14V 1.2V ±2%

VOUT1 Maximum Output Current, IOUT1 VIN = 7V to 14V, VOUT1 = 1.5V 30A

VOUT2 Maximum Output Current, IOUT2 VIN = 7V to 14V, VOUT2 = 1.2V 30A

Nominal Switching Frequency 400kHz

Efficiency

See Figures 2 and 3

VOUT1 = 1.5V, IOUT1 = 30A, VIN = 12V 91.1% Typical

VOUT2 = 1.2V, IOUT2 = 30A, VIN = 12V 90.0% Typical

Specifications are at TA= 25°C, No Airflow

dc2002af

DEMO MANUAL DC2002A

Quick start proceDure

Demonstration circuit 2002A is easy to set up to evaluate

the performance of the LTC3774EUHE. Please refer to

Figure 1 for proper measurement equipment setup and

follow the procedure below.

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

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

and VIN supply to be 0V. For both assemblies, place

the jumpers in the following positions:

JP1 RUN1 ON

JP2 RUN2 ON

JP5 MODE CCM

2. Adjust the input voltage to be between 7V and 14V.

VOUT1 should be 1.5V ±2%.

VOUT2 should be 1.2V ±2%.

3. Next, apply 30A load to each output and re-measure

VOUT.

4. OncetheDCregulationisconfirmed,observetheoutput

voltage ripple, load step response, efficiency and other

parameters.

Note 1. Use the BNC connectors labeled VOUT1 or VOUT2

to measure the output voltage ripple.

Note 2. Do not connect load from the VOS1+turret to the

VOS1–turret or from the VOS2+turret to the VOS2–tur-

ret. This could damage the converter. Only apply load

across the stud connectors on the edge of the board.

Dynamic Load Circuit (Optional)

Demonstration circuit 2002A provides a simple load step

circuit consisting of a MOSFET and sense resistor for each

rail. To apply a load step, follow the steps below.

1. Pre-set the amplitude of a pulse generator to 0.0V and

the duty cycle to 5% or less.

2. Connect the scope to the VOUT1/VOUT2 BNC connectors

for the rail under test with a coax cable. To monitor the

load step current, connect the scope probe across the

ISTEP± turrets for that rail.

3. Connect the output of the pulse generator to the PULSE

GEN turret for the rail under test and connect the return

to the adjacent GND turret.

4. 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 5mV/Amp.

Single Output/Dual Phase Operation

A single output/dual phase converter may be preferred for

higher output current applications. The optional compo-

nents required to tie the phases together are found on the

lower left of the 1st sheet. To tie the two outputs together,

make the following modifications:

1. Tie the two VOUT shapes together with a piece of copper

or a 0mΩ jumper at R47 and R36. One part to consider

is Tepro RN5326.

2. Tie VOSNS1 to VOSNS2 by stuffing a 0Ω resistor at R53

and tie VOS1–to VOS2–by stuffing a 0Ω resistor at R92.

3. Tie ITH1 to ITH2 by stuffing a 0Ω resistor at R68.

4. Tie RUN1 to RUN2 by stuffing a 0Ω resistor at R54.

5. Tie TK/SS1 to TK/SS2 by stuffing a 0Ω resistor at R48.

Paralleling Boards

Up to 6 DC2002A demo boards can be paralleled to

produce a single output, 12 phase converter. To connect

two or more DC2002A boards together, first tie the two

phases together as described in the Single Output/Dual

Phase Operation section. Next, place the boards side by

side such that header J8 of one board mates with socket

J9 of the other. This will connect the common control

signals together which are the VOSNS, VOS–, ITH, RUN

and TK/SS signals. It will also tie the CLKOUT signal of

one phase to the PLLIN input of the other phase. Next,

tie the VOUT, VIN and GND of the boards together using

the exposed copper on the edges of the board. Figure 6

shows how to tie 2 boards together for a single output,

4 phase converter.

dc2002af

DEMO MANUAL DC2002A

Quick start proceDure

–

VOUT *A

VOUT2 *A

VIN1 *B

–

VIN2 *B

–

IIN IOUT1

VOUT1

LOAD

VIN

SUPPLY

–

IOUT2

VOUT2

LOAD

–

*A MONITOR THE OUTPUT VOLTAGE ACROSS EITHER COUT4 OR COUT9 FOR ACCURATE EFFICIENCY MEASUREMENTS.

*B MONITOR THE VOLTAGE AT VIN1 WHEN MEASURING THE EFFICIENCY OF PHASE 1 AND VIN2 WHEN MEASURING THE

EFFICIENCY OF PHASE 2.

Figure 1. Proper Measurement Equipment Setup

dc2002af

DEMO MANUAL DC2002A

100

0 10 20 30 40

Load Current (Amps)

Efﬁciency (%)

VIN = 7V

VIN = 14V

VIN = 12V

L = Würth 744301033

0.33µH, DCR = 0.32mΩ TYP

FDMF6820A DrMOS

Quick start proceDure

Figure 2. Efficiency Curves for the 1.5V Rail at VIN = 12V, 14V and 7V in CCM.

Figure 3. Efficiency Curves for the 1.2V Rail at VIN = 12V, 14V and 7V in CCM.

1.5V/30A Rail, CCM, fSW = 400kHz

1.2V/30A Rail, CCM, fSW = 400kHz

Load Current (Amps)

Efﬁciency (%)

VIN = 7V

VIN = 14V

VIN = 12V

100

0 10 20 30 40

L = Würth 744301033

0.33µH, DCR = 0.32mΩ TYP

FDMF6820A DrMOS

dc2002af

DEMO MANUAL DC2002A

Quick start proceDure

Figure 4. 50% to 100% to 50% Load Step Response of the 1.5V Rail.

COUT = 3×Sanyo 2R5TPE330M9 || 2×100µF X5R 1206, L = Würth 744301033 (0.33µH), fSW = 400kHz.

Figure 5. 50% to 100% to 50% Load Step Response of the 1.2V Rail.

COUT = 3×Sanyo 2R5TPE330M9 || 2×100µF X5R 1206, L = Würth 744301033 (0.33µH), fSW = 400kHz.

1.5V(AC)

50mV/DIV

15A

DC2002A F04

30A

144mV

50µs/DIV

LOAD STEP

5A/DIV

1.2V(AC)

50mV/DIV

15A

30A

136mV

50µs/DIV

LOAD STEP

5A/DIV

DC2002A F05

dc2002af

DEMO MANUAL DC2002A

Quick start proceDure

BOARD #1 BOARD #2

VOUT

VIN

TOP LAYER

BOARD #2 BOARD #1

BOTTOM LAYER

GND

= COPPER FOIL

Figure 6. How to Parallel Tw o Boards for a Single Output, 4 Phase Converter

dc2002af

DEMO MANUAL DC2002A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 CIN1, CIN2 CAP, 180µF, 20%, 16V, OSCON SANYO, 16SVP180MX

2 4 CIN3, CIN4, CIN5, CIN6 CAP, 22µF, 20%, 16V, X5R 1210 MURATA, GRM32ER61C226KE20L

3 6 COUT1-COUT3, COUT6-COUT8 CAP, 330µF, 20%, 2.5V, 7343 SANYO, 2R5TPE330M9

4 4 COUT4, COUT5, COUT9, COUT10 CAP, 100µF, 20%, 6.3V, X5R 1206 MURATA, GRM31CR60J107ME39L

5 6 C1, C9, C36, C37, C38, C40 CAP, 0.22µF, 10%, 25V, X7R 0603 AVX, 06033C224KAT2A

6 2 C2, C13 CAP, 0.1µF, 10%, 25V, X7R 0603 AVX, 06033C104KAT2A

7 4 C3, C11, C34, C35 CAP, 2.2µF, 10%, 16V, X7R 0603 MURATA, GRM188R61C225KE15D

8 2 C5, C10 CAP, 0.01µF, 10%, 25V, X7R 0603 AVX, 06033C103KAT2A

9 2 C6, C14 CAP, 2200pF, 5%, 25V, X7R 0603 AVX 06033C222JAT2A

10 2 C7, C41 CAP, 330pF, 10%, 50V, NPO 0603 AVX 06035A331KAT

11 1 C8 CAP, 4.7µF, 10%, 16V, X7R 0805 AVX, 0805YC475KAT2A

12 1 C12 CAP, 1µF, 20%, 25V, X5R 0603 AVX, 06033D105MAT2A

13 2 C46, C47 CAP, 22pF, 10%, 25V, NPO 0603 AVX, 06033A220KAT2A

14 2 C28, C29 CAP, 10µF, 20%, 6.3V, X5R 0805 AVX, 08056D106MAT2A

15 2 L1, L2 IND., 0.33µH, 0.325mΩ, DCR 20% WÜRTH, 744301033

16 2 R1, R45 RES, 40.2k, 1%, 1/10W, 0603 VISHAY, CRCW060340K2FKEA

17 3 R2, R25, R35 RES, 2.2Ω, 1%, 1/10W, 0603 VISHAY, CRCW06032R20FKEA

18 2 R3, R26 RES, 1Ω, 1%, 1/10W, 0603 VISHAY, CRCW06031R00FKEA

19 12 R4-R7, R9, R29, R30, R40, R41,

R46, R85, R89 RES, 10k, 1%, 1/10W, 0603 VISHAY, CRCW060310K0FKEA

20 1 R8 RES, 15k, 1%, 1/10W, 0603 VISHAY, CRCW060315K0FKEA

21 4 R11, R18, R39, R43 RES, 10Ω, 1%, 1/10W, 0603 VISHAY, CRCW060310R0FKEA

22 3 R12, R21, R22 RES, 0Ω, JUMPER 0603 VISHAY, CRCW06030000Z0EA

23 2 R20, R42 RES, 4.64k, 1%, 1/10W, 0603 VISHAY, CRCW06034K64FKEA

24 1 R23 RES, 37.4k, 1%, 1/10W, 0603 VISHAY, CRCW060337K4FKEA

25 2 R38, R51 RES, 931Ω, 1%, 1/10W, 0603 VISHAY, CRCW0603931RFKEA

26 2 R49, R50 RES, 0.001Ω, 2512, 5% PANASONIC ERJM1WTJMOU

27 2 R73, R88 RES, 100K 1% 1/10W 0603 VISHAY, CRCW0603100KFKEA

28 1 U1 LTC3774EUHE LINEAR TECH., LTC3774EUHE#PBF

29 2 U2, U3 MOSFET, DrMOS DC/DC 3.3V PWM FAIRCHILD, FDMF6820A

30 2 R19, R37 RES, 8.06k, 1%, 1/16W, 0603 VISHAY, CRCW06038K06FKEA

5V BIAS (for DrMOS)

1 1 R59 RES, 0Ω, JUMPER 1206 VISHAY, CRCW12060000Z0EA

2 1 U4 I.C., BUCK REGULATOR LT3470ETS8 LINEAR TECH., LT3470ETS8#PBF

3 1 C17 CAP, 0.22µF, 10%, 25V, X7R 0603 AVX, 06033C224KAT2A

4 2 C18, C26 CAP, 1µF, 20%, 25V, X5R 0603 AVX, 06033D105MAT2A

5 1 L3 IND., 33µH, -53DLC TOKO, A914BYW-330M=P3

6 1 C19 CAP, 22µF, 20%, 16V, X5R 1210 MURATA, GRM32ER61C226KE20L

7 1 C21 CAP, 22pF, 10%, 25V, NPO 0603 AVX, 06033A220KAT2A

8 1 R61 RES, 604k, 1%, 1/10W, 0603 VISHAY, CRCW0603604KFKEA

9 1 R63 RES, 200k, 1%, 1/10W, 0603 VISHAY, CRCW0603200KFKEA

dc2002af

DEMO MANUAL DC2002A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Dynamic Load Circuits

1 2 R56, R58 RES, 10k, 1%, 1/10W, 0603 VISHAY, CRCW060310K0FKEA

2 2 Q1, Q2 MOSFET, N-Channel 30-V VISHAY, SUD50N03-12P-E3

3 2 R57, R60 RES 0.005Ω, 1%, 0.5W, 2010 VISHAY, WSL20105L000FEA

Additional Components

1 0 CIN7-CIN12, CIN13, CIN14, C25 CAP, 1210 OPT

2 0 COUT15-COUT20 (OPT) CAP, 7343 OPT

3 0 COUT11-COUT14 CAP, 1206 OPT

4 0 C16 CAP, 0805 OPT

5 0 C15, C20, C22-C24, C27, C30-C33,

C39, C42, C43, C44-C48 CAP, 0603 OPT

6 0 D1 DIODE SOT23 OPT

7 0 D2, D3 DIODE SOD-323 OPT

8 0 L4 IND, -53DLC OPT

9 0 PB1 POWER BLOCK, D12S1R845A OPT

10 0 Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10 MOSFET, PG-TDSON-8 OPT

11 0 RN1, RN2 RES, NTC, 0805 OPT

12 0 R10, R14, R15, R24, R27, R28,

R31, R33, R44, R48, R52-R55,

R62, R65-R72, R74-R84, R86, R87,

R90, R91, R92

RES, 0603 OPT

13 0 R16, R32, R17, R34 RES, 0603 OPT

14 0 R36, R47 RES, 2512 OPT

15 0 R64 RES, 1206 OPT

16 0 U5 OPT, BUCK REGULATOR LT3470ETS8 OPT

17 0 U8, U9 GATE DRIVER, LTC4449EDCB OPT

18 0 E28 OPT, TESTPOINT, TURRET, .095" OPT

19 0 JP4 HEADER, 3 PIN, 0.079 SINGLE ROW OPT

Hardware

1 25 E1-E13, E16-E25, E29, E30 TESTPOINT, TURRET, .095" MILL MAX, 2501-2-00-80-00-00-07-0

24 JP1, JP2, JP3, JP5 HEADER, 3 PIN 0.079 SINGLE ROW SULLINS, NRPN031PAEN-RC

3 4 XJP1, XJP2, XJP3, XJP5 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G

4 6 J1, J2, J3, J4, J5, J6 STUD, TEST PIN PEM, KFH-032-10

5 12 (J1, J2, J3, J4, J5, J6)x2 NUT, BRASS PL #10-32 ANY, 10-32M/S BR PL

6 6 J1, J2, J3, J4, J5, J6 RING, LUG #10 KEYSTONE, 8205

7 6 J1, J2, J3, J4, J5, J6 WASHER, TIN PLATED BRASS ANY, #10EXT BZ TN

8 2 J7, J10 CON, BNC, 5 PINS CONNEX, 112404, 7 Trays

9 1 J8 Header, Dbl Row, RT Angle, 2 ×4, 8 Pin MILL-MAX, 802-10-008-20-001000

10 1 J9 Socket, Dbl Row, RT Angle, 2 ×4, 8 Pin MILL-MAX, 803-43-008-20-001000

dc2002af

DEMO MANUAL DC2002A

schematic Diagram

dc2002af

DEMO MANUAL DC2002A

schematic Diagram

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