Linear Technology DC1734A Quick setup guide

dc1734af

DEMO MANUAL DC1734A

DESCRIPTION

LT8582

Dual 3A Boost/Inverting/SEPIC

DC/DC Converter

Demonstration circuit 1734A features the dual channel

8582 in boost and inverting regulator configurations.

The circuit is designed to convert a 5V to 10V input source

to 12V at 900mA and –12V at 590mA as shown in Table 1.

Table 1. Maximum Guaranteed Output Currents

VIN (V) MAX ILOAD1 (mA) MAX ILOAD2 (mA)

4.5 775 540

5.0 900 590

5.5 1000 625

To limit the temperature rise of the chip to 40°C, on the

demo board with no air flow, the maximum combined

output power is 15W. Additional input bulk capacitance

may be needed, subject to source impedance.

DC1734A is designed tosurvive output short circuit events.

On the positive channel an external disconnect MOSFET

protects the boost converter. The negative channel is

based on dual inductor inverting topology and does not

need the external MOSFET as it is inherently output short

protected. The circuit board includes an option to install

the external disconnect MOSFET at the input side of the

positive channel. To use it, remove Q1 and R1 from the

top of the circuit board and install them on the back, in

the location of Q2 and R2. Then, place a jumper from Q1’s

source to drain and cut the top copper as shown in Figure 6.

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.

PERFORMANCE SUMMARY

To change the topology of channel 1 from boost to invert-

ing: Replace D1 with a capacitor similar to C12, replace

C2 with a diode similar to D3, placing the diode so that

its cathode is connected to ground, and replace R16 with

an inductor similar to L3.

To changethe topology ofchannel 2 frominverting toboost:

Replace C12 with a diode similar to D1, placing the diode so

that its anodeis connected toL2, replaceD3 with acapacitor

similar to C2, and replace L3 with a jumper resistor similar

to R16. However, this configuration will not be output short

protected since it lacks the external disconnect MOSFET.

Each channel of the LT8582 includes a 42V master and slave

power switchcombinationwith3Atotalcurrentandcaneasily

beconfiguredasaboost,SEPIC,invertingorflybackconverter.

The LT8582 has a 2.5V to 22V operating input range, UVLO,

soft-start,programmable switchingfrequencyand manyother

features. The LT8582 data sheet gives a complete description

of the part, its operation and application information. The

data sheet must be read in conjunction with this quick start

guide for working on or modifying the demo circuit 1734A.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 510V

VOUT1 Channel 1 Output Voltage Accuracy VIN = 5V to 10V, ILOAD = 900mA 11.6 12 12.4 V

Channel 1 Output Voltage Ripple VIN = 5V, ILOAD = 900mA 60 mVPP

Channel 1 Efficiency VIN = 5V, ILOAD = 900mA 86 %

Channel 1 Efficiency VIN = 10V, ILOAD = 900mA 92 %

VOUT2 Channel 2 Output Voltage Accuracy VIN = 5V to 10V, ILOAD = 590mA –11.5 –12 –12.3 V

Channel 2 Output Voltage Ripple VIN = 5V, ILOAD = 590mA 56 mVPP

Channel 2 Efficiency VIN = 5V, ILOAD = 590mA 83 %

Channel 2 Efficiency VIN = 10V, ILOAD = 590mA 85 %

fSSwitching Frequency 1 MHz

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dc1734af

DEMO MANUAL DC1734A

Figure 1. Proper Measurement Equipment Setup

Demonstration circuit DC1734A is easy to set up to evalu-

ate the performance of the LT8582. Refer to Figure 1 for

proper measurement equipment set-up and follow the

procedure below.

To measure voltage ripple, care must be taken to avoid a

long ground lead on the oscilloscope probe. Remove the

oscilloscope probe end cap and ground lead and set the

bandwidth limit on the oscilloscope. Measure the input

voltage ripple by touching the probe tip and ground directly

across VIN and GND terminals. See Figure 2 for proper

input voltage ripple measurement technique. Measure the

positive output voltage ripple by touching the probe tip

directly across output capacitor C16 terminals, connect-

ing the probe ground terminal to the board’s GND plane.

Measure the negative output voltage ripple by touching the

probe tip directly across output capacitor C9, connecting

the probe ground terminal to the board’s GND plane. See

Figure 3 for proper output voltage ripple measurement

technique.

1. Place the on board jumpers in the following positions:

To activate boost converter: JP1 ON

To activate inverting converter: JP2 ON

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

and GND. Apply 7.5V to the input (source must have

greater than 10A capability).

3. Check for the proper output voltages.

NOTE. If there is no output, temporarily disconnect the

load to make sure that the load is not set too high.

4. Once the proper output voltage is established, adjust

the load and the input voltage within the operating

range and observe the output voltage regulation, ripple

voltage, efficiency and other parameters. The efficiency

graphs of the two channels are provided in Figure 4

and Figure 5.

QUICK START PROCEDURE

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dc1734af

DEMO MANUAL DC1734A

QUICK START PROCEDURE

Figure 2. Proper Input Voltage Ripple Measurement Technique

Figure 3. Proper Output Voltage Ripple Measurement Technique

VIN GND

OSCILLOSCOPE

PROBE

OUTPUT

CAP.

OSCILLOSCOPE

PROBE

SOLDER A SMALL

PIECE OF SOLID WIRE

BOARD GND

PLANE

SOLDER

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DEMO MANUAL DC1734A

QUICK START PROCEDURE

Figure 4. Channel 1 Boost Regulator Efficiency at VIN = 5V

Figure 5. Channel 2 Inverting Regulator Efficiency at VIN = 5V

LOAD CURRENT (A)

EFFICIENCY (%)

100

0.7 0.8 0.90.1 0.2 0.3 0.4 0.5

dc1734a F04

0.6

LOAD CURRENT (A)

EFFICIENCY (%)

100

0.5 0.60.1 0.2 0.3 0.4

dc1734a F05

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DEMO MANUAL DC1734A

SHORT Q1’s SOURCE AND

DRAIN PADS HERE

CUT COPPER

HERE

Figure 6. Using Channel 1 Input Disconnect Option (See Text)

BOARD MODIFICATIONS

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DEMO MANUAL DC1734A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 3 C1, C2 CAP., X5R, 10μF, 16V, 20% 1206 AVX, 1206YD106MAT2A

2 1 C9, C16 CAP., X5R, 22μF, 16V, 20% 1206 TAIYO YUDEN, EMK316BJ226ML-T

3 2 C11, C17 CAP., X5R, 4.7μF, 16V, 20% 1206 TAIYO YUDEN, EMK316BJ475ML-T

4 2 C4, C8 CAP., X7R, 2.2nF, 50V, 10%, 0402 AVX, 04025C222KAT2A

5 2 C5, C10 CAP., NPO, 100pF, 16V, 10%, 0402 AVX, 0402YA101KAT2A

6 2 C6, C7 CAP., X7R, 0.1μF, 16V, 10% 0402 TDK, C1005X7R1C104K

7 1 C12 CAP., X7R, 2.2μF, 25V, 10%, 0805 MURATA, GRM21BR71E225KA73L

8 1 D1 RECTIFIER, DFLS220L, PowerDI-123 DIODES/ZETEX, DFLS220L-7

9 1 D3 RECTIFIER, DFLS130L, PowerDI-123 DIODES/ZETEX, DFLS130L-7

10 1 L1 INDUCTOR, 4.7μH VISHAY, IHLP2525CZER4R7M11

11 1 L2 INDUCTOR, 10μH VISHAY, IHLP2525CZER100M11

12 1 L3 INDUCTOR, 10μH VISHAY, IHLP2020BZER100M11

13 1 Q1 P-CH MOSFET, FDMC510P, POWER-33 FAIRCHILD, FDMC510P

14 1 R1 RES., CHIP, 6.04k, 1/16W, 1% 0402 VISHAY, CRCW04026K04FKED

15 1 R3 RES., CHIP,130k, 1/10W, 1%, 0603 NIC, NRC06F1303TRF

16 2 R4, R11 RES., CHIP, 232k, 1/8W, 1%, 0805 VISHAY, CRCW0805232KFKEA

17 1 R5 RES., CHIP, 8.06k, 1/16W, 1% 0402 VISHAY, CRCW04028K06FKED

18 2 R8, R10 RES., CHIP, 80.6k, 1/16W, 1% 0402 VISHAY, CRCW040280K6FKED

19 3 R6, R9, R13 RES., CHIP, 100k, 1/16W, 5% 0402 NIC, NRC04J104TRF

20 1 R12 RES., CHIP, 16.9k, 1/16W, 1% 0402 VISHAY, CRCW040216K9FKED

21 1 R15 RES., CHIP,143k, 1/10W, 1%, 0603 NIC, NRC06F1433TRF

22 1 R16 RES., CHIP, 0Ω, 1/4W, 1206 NIC, NRC12ZOTR

23 1 U1 IC., LT8582EDKD, DFN-24(7MMX4MM) LINEAR TECH., LT8582EDKD

Additional Demo Board Circuit Components

1 0 C3, C14 CAP., 0603, OPTION

2 0 C13 CAP., 1206, OPTION

3 0 C15 CAP., SMD 8X10.5 & THRU HOLE 8X9.5, OPTION

4 0 D2 DIODE, SOD-323, OPTION

5 0 Q2 MOSFET, POWER-33, OPTION

6 0 R2 RES., CHIP, 0402, OPTION

7 0 R7, R14 RES., CHIP, 0805, OPTION

Hardware for Demo Board Only

1 9 E1-E9 TESTPOINT, TURRET, .094" pbf MILL-MAX, 2501-2-00-80-00-00-07-0

2 2 JP1, JP2 3 PIN 0.079 SINGLE ROW HEADER SAMTEC, TMM103-02-L-S

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

4 4 (STAND-OFF) STAND-OFF, NYLON 0.25" KEYSTONE, 8831(SNAP ON)

5 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1734A

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dc1734af

DEMO MANUAL DC1734A

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

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dc1734af

DEMO MANUAL DC1734A

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 1111 • 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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