Linear Technology LTC7103 Quick setup guide

dc2317af

DEMO MANUAL

DC2317A

DESCRIPTION

LTC7103

105V, 2.3A Low EMI Synchronous

Step-Down Regulator

Demonstration circuit 2317A is a 100V monolithic DC/

DC step-down regulator featuring the LT C

7103. The

demo board is designed for a 5V/2.3A output from a 5V

to 100V input at 400kHz switching frequency. The wide

input range makes it suitable for automotive, industrial,

medical instrument, and telecom applications. This buck

regulator has a peak efficiency of 93.5% at 12VIN, 88.3%

at 48VIN and 81.5% at 100VIN (see Figure 3).

The LTC7103 is a compact, high efficiency synchronous

monolithic step-down switching regulator with fast cur-

rent programming. The power switches, compensation

network and other necessary circuits are inside of the

LTC7103 to minimize external components and simplify

design. The LTC7103 has wide operating range from 4.4V

to 105V. A 40ns minimum on-time, together with 100%

maximum duty cycle allow practical use at any output volt-

age between 1V and VIN. The switching frequency can be

programmed either via an oscillator resistor or an external

clock over a 200kHz to 2MHz range. Additional features

include a fast and accurate output current programming

and monitoring, and ultralow EMI/EMC emissions.

The demo board has an EMI filter installed. The EMI

performance of the board (with EMI filter) is shown in

Figure2. The figure shows that the circuit passes the

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

of Analog Devices, Inc. All other trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

CISPR 25 radiated emission test with a wide margin. To

achieve EMI/EMC performance as shown in Figure 2, the

input EMI filter is required and the input voltage should

be applied at +VIN_EMI turret pin.

The demo board provides current monitor and output

clock signal to interface with an external application cir-

cuit. User selectable mode selection (JP1) is provided and

Burst Mode

operation position is selected by default.

Burst Mode operation increases light load efficiency while

pulse-skipping mode allows constant-frequency operation

to a lighter load. This demo board allows phase-locked

loop (PLL) synchronization to an external clock by select-

ing SYNC mode on JP1 and by providing a clock signal

on CLKIN turret.

The LTC7103 data sheet gives a complete description of

the part, operation and application information. The data

sheet must be read in conjunction with this demo manual

for DC2317A. The LTC7103 is assembled in the 36 (26)

lead QFN package. Proper board layout is essential for

maximum thermal and electrical performance. See the

data sheet sections for details.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2317A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 5 100 V

VOUT Output Voltage 5 V

IOUT Output Current Range, Continuous Free Air 0 2.3 A

fSW Switching (Clock) Frequency 400 kHz

VOUTP-P Output Ripple VIN = 100V, VOUT = 5V, IOUT = 2.3A (20MHz BW) 50 mVP-P

POUT/PIN Efficiency VIN = 12V, IOUT = 1A

VIN = 48V, IOUT = 1A

92.6

88.1

Approximate Size Component Area x Top Component Height 1.0 × 0.7 × 0.3 Inches

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DEMO MANUAL

DC2317A

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

Refer to Figure 1 for proper measurement equipment

setup and follow the procedure below.

Note: When measuring the output voltage ripple, care

must be taken to avoid a long ground lead on the oscil-

loscope probe. Measure the output voltage ripple by

touching the probe tip and ground ring directly across

the last output capacitor as shown in Figure 1.

1. Place SW1 to ON position.

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

+VIN_EMI and GND. If the EMI/EMC performance is

not important, the input EMI filter can be bypassed by

connecting the input power supply to +VIN and GND.

3. With power off, connect loads from +VOUT to GND.

4. Turn on the power at the input. Make sure that the input

voltage does not exceeds 100V.

5. Check for the proper output voltage using a voltmeter.

Output voltage should be within 5.0V ± 0.1V.

Note: If there is no output, temporarily disconnect the

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

6. Once the proper output voltage is established, adjust

the load within the operating ranges and observe the

output voltage regulation, ripple voltage, efficiency and

other parameters.

7. An external clock can be added to the CLKIN terminal

when SYNC mode is used (JP1 on the SYNC position).

See the data sheet Frequency Selection and Phase-

Locked Loop section for details.

–

+–

LOAD

IOUT

VOUT

IIN

VIN

–

+–

POWER

SUPPLY

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DEMO MANUAL

DC2317A

Figure 2. EMI Performance in CISPR 25 Radiated Emission Test (48VIN from +VIN_EMI Turret Pin, 5VOUT/2A, fSW = 400kHz)

VERTICAL POLARIZATION

CLASS 5 PEAK LIMIT

LTC7103

FREQUENCY (MHz)

100

200

300

400

500

600

700

800

900

1000

AMPLITUDE (dBµV/m)

dc2017a F02a

HORIZONTAL POLARIZATION

CLASS 5 PEAK LIMIT

LTC7103

FREQUENCY (MHz)

100

200

300

400

500

600

700

800

900

1000

AMPLITUDE (dBµV/m)

dc2017a F02b

QUICK START PROCEDURE

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DEMO MANUAL

DC2317A

Figure 3. Efficiency at Various Input Voltages (Conditions: Burst Mode Operation)

QUICK START PROCEDURE

Figure 4. Efficiency at Various Input Voltages (Conditions: Pulse-Skipping Mode)

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DEMO MANUAL

DC2317A

QUICK START PROCEDURE

Figure 5. Output Ripple at 100VIN, 5VOUT and 2.3AOUT (50mV, 500ns/DIV, 20MHz Bandwidth)

Figure 6. Transient Response Waveform at 48VIN, 5VOUT and 1.1AOUT to 2.3AOUT to 1.1AOUT (1A, 200mV, 50μs/DIV, 20MHz Bandwidth)

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DEMO MANUAL

DC2317A

Figure 7. Thermal Plots (without Forced Air)

Conditions: 12VIN, 5VOUT at 2.3AOUT Conditions: 24VIN, 5VOUT at 2.3AOUT

Conditions: 48VIN, 5VOUT at 2.3AOUT Conditions: 100VIN, 5VOUT at 2.3AOUT

QUICK START PROCEDURE

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DEMO MANUAL

DC2317A

Figure 8. Board Photo

QUICK START PROCEDURE

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DEMO MANUAL

DC2317A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 3 C1, C13, C16 CAP, X7R 4.7µF, 100V, 20% 1210 MURATA, GRM32ER72A475KE14

2 1 C2 CAP, X7R, 0.1µF, 100V, 10%, 0805 MURATA, GCM21BR72A104KA37L

3 1 C3 CAP, X7R, 0.1µF, 25V, 10%, 0603 MURATA, GRM188R71E104KA01D

4 1 C5 CAP, X6S, 100µF, 6.3V, 20%, 1210 MURATA, GRM32EC80J107ME20L

5 1 C7 CAP, X7R, 1µF, 16V, 10%, 0805 AVX, 0805YC105KAT2A

6 1 C14 CAP, 33µF, 100V, 200mA PANASONIC, EEEFK2A330P

7 1 C18 CAP, X7R, 1µF, 50V, 10%, 0603 YAGEO.,CC0603KRX7R9BB105

8 1 C20 CAP, X7R, 0.22µF, 100V, 10%, 0805 TAIYO YUDEN,HMK212B7224KGHT

9 1 L1 IND, 15µH COILCRAFT, XAL6060-153ME

9 0 L1 (ALTERNATE) IND, 15µH WURTH, 74439346150

10 1 R1 RES, 10MEG, 1%, 0805 VISHAY, CRCW080510M0FKEA

11 5 R2, R5, R6, R14, R24 RES, 0Ω, JUMPER 0603 VISHAY, CRCW06030000Z0EA

12 1 R8 RES, 1k, 1%, 0603 VISHAY, CRCW06031K00FKEA

13 1 R13 RES, 100k, 1%, 0603 VISHAY, CRCW0603100KFKEA

14 1 R15 RES, 8.87k, 1%, 0603 VISHAY, CRCW06038K87FKEA

15 1 R16 RES, 17.8k, 1%, 0603 NIC, NRC06F1782TRF

16 1 U1 LTC7103EUHE32, QFN 5mm × 6mm LINEAR TECH.CORP. LTC7103EUHE#PBF

Additional Demo Board Circuit Components

18 0 C4, C6, C8–C12, C15, C17, C19, C21 CAP, OPTIONAL OPTIONAL

19 0 L2 IND, OPTIONAL OPTIONAL

20 0 R3, R4, R7, R12, R17, R21–R23, R25–R27 RES, OPTIONAL OPTIONAL

Hardware for Demo Board Only

22 11 E1–E4, E6–E12 TESTPOINT, TURRET 0.095" MILLMAX, 2501-2-00-80-00-00-07-0

23 2 FB1, FB2 FERRITE BEAD, 120Ω AT 100MHz, 1206 MURATA., BLM31PG121SN1

24 1 FB3 RES, 0Ω, SHUNT,1206 VISHAY, CRCW12060000Z0EA

25 1 JP1 HEADER, 4-PIN DBL ROW 2mm SAMTEC, TMM-104-02-L-D

26 1 XJP1 SHUNT SAMTEC, 2SN-BK-G

27 1 SW1 SWITCHE, SUB MINIATURE SLIDE SWITCHE C&K.,JS202011CQN

28 4 (STAND-OFFS) STAND-OFF, NYLON 0.5" TALL KEYSTONE, 8833 (SNAP ON)

29 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2317A

30 2 STENCILS TOP AND BOTTOM STENCIL DC2317A

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DEMO MANUAL

DC2317A

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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DEMO MANUAL

DC2317A

 LINEAR TECHNOLOGY CORPORATION 2017

LT 0617 • 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 application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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