Linear Technology DC2061A Quick setup guide

dc2061af

DEMO MANUAL DC2061A

DESCRIPTION

LTC3784

High Efficiency PolyPhase

Synchronous Boost Converter

Demonstration circuit DC2061 is a DC/DC synchro-

nous boost converter featuring the LT C

3784 con-

stant frequency current mode synchronous boost

controller. The DC2061A operates over a 6V to 60V

input, develops a 48V output and provides 3A to 12A

of output current as shown in Figure 3. The 150kHz

(2 • 150kHz at the output) constant frequency operation

results in a small and efficient circuit. The converter pro-

vides high output voltage accuracy (typically ±3%) over

wide load range with no minimum load requirement. The

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

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

owners.

PERFORMANCE SUMMARY

demonstration circuit can be easily modified to generate

different output voltages.

The DC2061 has a small circuit footprint. It is a high per-

formance and cost effective solution for telecom, auto-

motive and Power over Ethernet applications.

Design files for this circuit board are available at

http://www.linear.com/demo

Specifications are at TA= 25°C

PARAMETER CONDITION VALUE

Minimum Input Voltage IOUT = 0A to 3A 6V

Maximum Input Voltage IOUT = 0A to 12A 60V

VOUT VIN = 6V to 47V, IOUT = 0A to 3A 48V ±3%

Typical Output Ripple VOUT VIN = 6V to 47V, IOUT = 3A 200mVP-P

Nominal Switching Frequency 150kHz

QUICK START PROCEDURE

Demonstration circuit DC2061 is easy to set up to evaluate

the performance of the LTC3784. For proper measure-

ment equipment setup refer to Figure 1 and follow the

procedure below:

Note: When measuring the input or output voltage ripple,

care must be taken to minimize the length of oscilloscope

probe ground lead. Measure the input or output voltage

ripple by connecting the probe tip directly across the VIN

or VOUT and GND terminals as shown in Figure 2.

1. With power off, connect the input power supply to VIN

and GND.

2. Keep the load set to 0A or disconnected.

3. Turn the input power source on and slowly increase

the input voltage. Be careful not to exceed 60V.

Note: Make sure that the input voltage, VIN, does not ex-

ceed 60V. If higher operating voltage is required, power

components with higher voltage ratings should be used.

When the input voltage is set higher than 48V the output

voltage will follow the input voltage.

4. Set the input voltage to 6V and check for the proper

output voltage of 48V. Set the output load to 2A. If there

is no output, temporarily disconnect the load to make

sure that the load is not set too high.

5. Once the proper output voltage is established, adjust

the load and observe the output voltage regulation,

ripple voltage, efficiency and other parameters.

dc2061af

DEMO MANUAL DC2061A

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Input or Output Ripple

QUICK START PROCEDURE

+ –

VOUT GND

COUT

dc2061af

DEMO MANUAL DC2061A

QUICK START PROCEDURE

Changing The Output Voltage

To set the output voltage lower than 48V, change the

bottom voltage divider resistors connected to LTC3784

FB pin (see the Schematic Diagram). To get higher than a

48V output voltage, MOSFETs and capacitors with higher

voltage ratings may be required.

Note that the output voltage will start following the input

voltage when input voltage is greater than the voltage

set by the voltage divider. In this mode (wire mode) the

synchronous output rectifier MOSFET is turned continu-

ously ON. The only losses in this mode are due to the

current sense resistors, inductors and output MOSFETs

DC resistance.

Converter Efficiency And Output Current

The DC2061 output current capability depends on the

input voltage and proper cooling. Typical performance of

DC2061A is shown in Figure 3. As can be seen from Fig-

ure3, the output current capability depends on the input

voltage. Also, when input voltage is equal to, or higher

than the output voltage setting (wire mode) the efficiency

is very high (99%) since the converter is not really running

and the output MOSFET is shorting VIN to VOUT.

Figure 3. High Efficiency of DC2061 Allows the Board to Be Used

in Thermally Critical Applications with Outputs Over 3A

Figure 4. Fast Transient Response of DC2061 is Achieved with a

Small Amount of Output Capacitance

IOUT (A)

EFFICIENCY (%)

82 4 8

26 10

6VIN

9VIN

12VIN

24VIN

Output Load Step Response

The load step response of DC2061A is very good even

though relatively small amount of output capacitance

is present at the output. If higher load steps need to be

handled more output capacitance can be added in order to

keep the voltage transients at the desired level. The load

step transients are shown in Figure 4. Also, note that the

load step response even from 0% load is excellent thanks

to synchronous rectification.

Soft-Start Function

The DC2061 features soft-start circuit that controls the

inrush current and output voltage ramp at start-up. The

capacitor C15 (Figure 6) controls the start-up period. The

start-up waveforms are shown in Figure 5. Please note the

small output voltage step at about –2ms mark. The step

is resulting from synchronous MOSFET being turned on.

When the synchronous MOSFET is turned on the voltage

drop across the synchronous MOSFET (body diode) is

reduced from about 0.7V to IOUT • RDS(ON). While the syn-

chronous MOSFET is in off state (prior to –2ms mark) the

synchronous MOSFET body diodes are dissipating about

0.7V • IOUT or about 2.1W with 3A load. Please refer to

the LTC3784 data sheet for details about proper handling

of synchronous MOSFETs in your application.

dc2061af

DEMO MANUAL DC2061A

PARTS LIST

QUICK START PROCEDURE

Figure 5. The DC2061 Ramps the Output Slowly at Start-Up

without Generating an Input Current Surge

Bias Circuit

The LTC3784 can operate with input voltages up to 65V.

However, depending oninput voltage, operating frequency

and MOSFETs that are used the power dissipation in the

part may become too high. In order to provide bias power

at high input voltage the DC2061 circuit is equipped with

high efficiency bias circuit LTC3630A.

If the circuit is to be used with limited input voltage the bias

power can be derived directly from input power source.

Options to power the LTC3784 from VIN or VOUT are

provided on DC2061. Please remove the LTC3630A circuit

in order to use these options. Also, refer to the data sheet

for more information about bias power.

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 5 CIN1, COUT5, COUT10, COUT11, COUT12 CAP., 33µF, 63V, EP-CAP SUN ELECTRONICS, 63HVH33M

2 12 COUT1, COUT2, CIN2, COUT3, CIN3, COUT4,

CIN4, CIN5, COUT6, COUT7, COUT8, COUT9

CAP., X7S, 4.7µF 100V,20% 3225/1210 TDK, C3225X7S2A475M

3 1 C2 CAP., NPO, 100pF, 25V,10%, 0603 AVX, 06033A101KAT

4 1 C3 CAP., X7R, 15nF, 25V, 10%, 0603 AVX, 06033C153KAT

5 5 C4, C9, C16, C17 CAP., X5R, 0.1µF, 25V, 10%, 0603 AVX, 06033D104KAT2A

6 2 C5, C10 CAP., NPO, 1000pF, 25V,10%, 0603 AVX, 06033A102KAT

7 1 C8 CAP., X5R, 4.7µF, 25V, 10%, 0805 TAIYO YUDEN, TMK212BJ475KG-T

8 1 C12 CAP., X7R, 0.1µF, 100V, 10%, 1206 AVX, 12061C104KAT

9 1 C13 CAP., X7R, 47nF, 25V, 10%, 0603 AVX, 06033C473KAT

10 1 C14 CAP., X5R, 22µF, 16V, 10%, 1206 AVX, 1206YD226KAT2A

11 1 C15 CAP., X5R, 1µF, 10V, 10%, 0603 AVX, 06033D104KAT2A

12 3 D1, D2 DIODE, BAS170W SOD323 INFINEON, BAS170W

13 1 D5 DIODE, PDZ6.8B SOD323 NXP, PDZ6.8B

14 2 L1, L2 IND, 10µH COILCRAFT, SER2918H-103KL

15 1 L3 IND, 220µH IND-744775222 WURTH ELEC., 744775222

16 4 Q2, Q4, Q6, Q8 MOSFET, N-Channel, LFPAK INFINEON, BSC028N06LS3

17 4 RSNS1, RSNS2, RSNS3, RSNS4 RES., Chip, 0.006Ω, 1%, 2010 VISHAY, WSL20106L000FEA

18 7 R2, R3, R7, R13, R15, R18, R21 RES., Chip, 0Ω, 1%, 0603 VISHAY, CRCW06030000Z0EA

19 1 R5 RES., Chip, 30.1k, 1%, 0603 VISHAY, CRCW060330K1FKEA

20 1 R6 RES., Chip, 475k, 1%, 0603 VISHAY, CRCW0603475KFKEA

21 2 R8 RES., Chip, 12.1k, 1%, 0603 VISHAY, CRCW060312K1FKEA

22 1 R9 RES., Chip, 15k, 1%, 0603 VISHAY, CRCW060315K0FKEA

dc2061af

DEMO MANUAL DC2061A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

23 2 R17, R23 RES., Chip, 10Ω, 1%, 0603 VISHAY, CRCW060310R0FKEA

24 2 R26, R35 RES., Chip, 100k, 1%, 0603 VISHAY, CRCW0603100KFKEA

25 1 R29 RES., Chip, 47k, 1%, 0603 VISHAY, CRCW060347K0FKEA

26 1 R30 RES., Chip, 523k, 1%, 0603 VISHAY, CRCW0603523KFKEA

27 1 R33 RES., Chip, 150k ,1%, 0603 VISHAY, CRCW0603150KFKEA

28 1 R34 RES., Chip, 38.3k ,1%, 0603 VISHAY, CRCW060338K3FKEA

29 1 R36 RES., Chip, 80.6k, 1%, 0603 VISHAY, CRCW060380K6FKEA

30 1 U1 I.C. LTC3784IUFD QFN28–4 x 5 LINEAR TECH., LTC3784IUFD#PBF

31 1 U2 I.C. LTC3630AEMSE LINEAR TECH., LTC3630AEMSE

Additional Demo Board Circuit Components

1 0 C1, C19, C20 OPT, 0603 OPT

2 0 D3, D4 DIODE, OPT PDS760 POWERID5-2P OPT

3 0 D6 DIODE, OPT SOD123 OPT

4 0 Q1, Q3, Q5, Q7 OPT, LFPAK OPT

5 0 R1, R4, R10, R11, R12, R14, R16, R27, R28,

R31, R32, R37, R38

OPT, 0603 OPT

Hardware-For Demo Board Only

1 11 E1, E5-E8, E11-E15, E21 TURRET, TESTPOINT , 091" MILL-MAX, 2501-2-00-80-00-00-07-0

2 2 E2, E4 JACK BANANA KEYSTONE, 575-4

3 2 E9, E10 STUD, TEST PIN PEM, KFH-032-10

4 4 (E9, E10) x 2 NUT, BRASS NUTS # 10-32 ANY, #10-32

5 2 E9, E10 RING, LUG RING # 10 KEYSTONE, 8205

6 2 E9, E10 WASHER, #10, TIN PLATED BRASS ANY, #10 EXT BZ TN

7 1 JP1 HEADER, 6 PINS 2 x 3 100 Ctrs. SAMTEC, TSW-106-07-L-D

8 2 JP2, JP4 HEADER, 3 Pins 2mm CTRS. SULLINS, NRPN031PAEN-RC

9 1 JP3 HEADER, 4 Pins 2mm CTRS. SULLINS, NRPN041PAEN-RC

10 3 XJP2, XJP3, XJP4 SHUNT, 2mm CTRS. SAMTEC, 2SN-BK-G

11 1 XJP1 SHUNT, 100 CTRS. SAMTEC SNT-100-BK-G

12 4 MTGS HEX STANDOFF 6-32 NYLON 3/4" KEYSTONE, 1903D

13 4 MTGS SCREW, PAN PHILLIPS 6-32 B & F, PMSSS 632 0038 PH

14 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2061A

15 2 STENCILS TOP AND BOTTOM STENCIL DC2061A

dc2061af

DEMO MANUAL DC2061A

SCHEMATIC DIAGRAM

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NOTES:

- SEE QSG

1. ALL RESISTORS ARE IN OHMS, 0603.

ALL CAPACITORS ARE IN MICROFARADS, 0603.

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2. INSTALL SHUNTS AS SHOWN.

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











































 

 









TECHNOLOGY



























































  

 



  

 



  

 





























 































 



























































































 



















 



























































 



























 



 

















  

 

 





 





































































 

 

 

 

 

 

 

 

 

 

 

 

 

 







 















































































 







































 



















































































































































 



 

















































 

















































































 



 

















































dc2061af

DEMO MANUAL DC2061A

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 DIAGRAM

 





 



  

 





 

 









TECHNOLOGY





























































 

 









TECHNOLOGY





























































 

 









TECHNOLOGY

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dc2061af

DEMO MANUAL DC2061A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2014

LT 0314 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LT C 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC2061A

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