Linear Technology DC2522A Manuale utente

dc2522af

DEMO MANUAL DC2522A

Description

LT8609S

42V, 2A/3A Peak Micropower

Synchronous Step-Down Regulator

Demonstration circuit 2522A is a 42V, 2A/3A peak micro-

power synchronous step-down regulator featuring the

8609S. The demo board is designed for 5V output

from a 5.5V to 42V input. The wide input range allows

a variety of input sources, such as automotive batter-

ies and industrial supplies. The LT8609S is a compact,

high efficiency, high speed synchronous monolithic step-

down switching regulator that consumes only 2.5μA of

quiescent current when output is regulated at 5V. Top

and bottom power switches, compensation components

and other necessary circuits are inside of the LT8609S to

minimize external components and simplify design.

The SYNC pin on the demo board is grounded by default

for low ripple Burst Mode

operation. Move JP1 to PULSE

SKIPPING position can change the operation mode to

pulse-skipping operation. Once JP1 is on SPREAD SPEC-

TRUM position, VCC is applied to the SYNC pin for low

EMI spread spectrum operation. To synchronous to an

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

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

performance summary

external clock, move JP1 to SYNC and apply the external

clock to the SYNC turret. Figure 1 shows the efficiency

of the circuit.

The demo board has an EMI filter installed. The radiated

EMI performances of the board (with EMI filter) are shown

in Figures 2 and 3. The red lines in Figures 2 and 3 are

CISPR25 class 5 peak limit. To use the EMI filter, the input

should be tied to VEMI, not VIN. An inductor L2, which is

a 0Ω jumper on the board by default now, can be added

in the EMI filter to further reduce the conducted emission.

The LT8609S 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 DC2522A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2522A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Voltage Range 5.5 42 V

VOUT Output Voltage 4.8 5 5.2 V

IOUT Maximum Output Current 2 A

fSW Switching Frequency 1.85 2 2.15 MHz

EFE Efficiency at DC VIN = 12V, IOUT = 1A 93.1 %

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dc2522af

DEMO MANUAL DC2522A

Quick start proceDure

DC2522A is easy to set up to evaluate the performance of

the LT8609S. Refer to Figure 4 for proper measurement

equipment setup and follow the procedure below:

NOTE:When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe. See Figure 5 for the proper scope

technique.

1. Set an input power supply that is capable of 42V/2A.

Then turn off the supply.

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

nals VIN and GND.

3. Turn on the power at the input.

NOTE: Make sure that the input voltage never exceeds

42V.

4. Check for the proper output voltage of 5V. Turn off the

power at the input.

5. Once the proper output voltage is established, connect

a variable load capable of sinking 2A at 5V to the output

terminals VOUT and GND. Set the current for 0A.

a. If efficiency measurements are desired, an ammeter

can be put in series with the output load in order to

measure the DC2522A’s output current.

b. A voltmeter can be placed across the output ter-

minals in order to get an accurate output voltage

measurement.

6. Turn on the power at the input.

NOTE: If there is no output, temporarily disconnect the

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

7. Once the proper output voltage is established again,

adjust the load and/or input within the operating range

and observe the output voltage regulation, ripple volt-

age, efficiency and other desired parameters.

8. An external clock can be added to the SYNC termi-

nal when SYNC function is used (JP1 on the SYNC

position). Please ensure that the chosen RT sets the

LT8609S switching frequency to equal or below the

lowest SYNC frequency. See the data sheet section,

Synchronization.

Figure 1. Efficiency vs Load Current at 2MHz Switching Frequency

IOUT (A)

EFFICIENCY (%)

100

50 1.5

DC2522a F01

20.5 1

12V INPUT

24V INPUT

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dc2522af

DEMO MANUAL DC2522A

Quick start proceDure

FREQUENCY (MHz)

VERTICAL POLARIZATION

PEAK DETECTOR

AMPLITUDE (dBµV/m)

FIXED FREQUENCY

SPREAD SPECTRUM MODE

CLASS 5 PEAK LIMIT

0 300200100 700500 900

DC2522a F02

1000600400 800

–10

–5

Figure 2. LT8609S Demo Circuit EMI Performance in CISPR25 Radiated Emission Test, Antenna Polarization:

Vertical (VIN = 14V, VOUT = 5V, IOUT = 2A, 2MHz Switching Frequency)

FREQUENCY (MHz)

VERTICAL POLARIZATION

AVERAGE DETECTOR

FIXED FREQUENCY

SPREAD SPECTRUM MODE

CLASS 5 AVERAGE LIMIT

0 300200100 700500 900

DC2522a F03

1000600400 800

–10

–5

AMPLITUDE (dBµV/m)

Figure 3. LT8609S Demo Circuit EMI Performance in CISPR25 Radiated Emission Test, Antenna Polarization:

Horizontal (VIN = 14V, VOUT = 5V, IOUT = 2A, 2MHz Switching Frequency)

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dc2522af

DEMO MANUAL DC2522A

Quick start proceDure

Figure 4. Proper Measurement Equipment Setup

Figure 5. Measuring Output Ripple

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dc2522af

DEMO MANUAL DC2522A

Quick start proceDure

Figure 6. DC2522A Output Ripple (VIN = 12V, VOUT = 5V, IOUT = 2A, 2MHz Switching Frequency)

500ns/DIV DC2522a F06

VOUT

5mV/DIV

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dc2522af

DEMO MANUAL DC2522A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C2 CAP, X7R, 4.7µF, 50V, 10% 1206 MURATA, GRM31CR71H475KA12L

2 1 C4 CAP, X7R, 1µF, 25V, 10%, 0603 MURATA, GRM188R71E105KA12D

3 1 C5 CAP, C0G, 10pF, 25V, 5%, 0603 AVX, 06033A100JAT2A

4 1 C6 CAP, X7R, 47µF, 10V, 10%, 1210 MURATA, GRM32ER71A476KE15L

5 1 C8 CAP, X7R, 0.01µF, 16V, 10%, 0603 AVX, 0603YC103KAT2A

6 1 L1 IND, 2.2µH COILCRAFT, XFL4020-222ME

7 1 R2 RES, CHIP, 18.2k, 1/10W, 1%, 0603 VISHAY, CRCW060318K2FKEA

8 1 R3 RES, CHIP, 49.9k, 1/10W, 1%, 0603 VISHAY, CRCW060349K9FKEA

9 2 R1, R4 RES, CHIP, 1M, 1/10W, 1%, 0603 VISHAY, CRCW06031M00FKEA

10 1 R5 RES, CHIP, 182k, 1/10W, 1%, 0603 VISHAY, CRCW0603182KFKEA

11 1 U1 IC, REGULATOR, LQFN-16 LINEAR TECHNOLOGY, LT8609SEV#PBF

Additional Demo Board Circuit Components

1 1 C1 CAP, ALUM 22µF 63V SUN ELECT, 63CE22BS

2 2 C3, C10 CAP, X7R, 4.7µF, 50V, 10% 1206 MURATA, GRM31CR71H475KA12L

3 1 C9 CAP, X7R, 4.7µF, 16V, 10%, 0805 MURATA, GRM21BR71C475K73L

4 1 C11 CAP, X7R, 1µF, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12L

5 1 C12 CAP, X7R, 0.1µF, 50V, 10%, 0603 MURATA, GRM188R71H104KA93D

6 1 FB1 FERRITE BEAD 0805 TDK, MPZ2012S331AT000

7 1 L2 RES, CHIP, 0Ω, 3/4W, 2010 VISHAY, CRCW20100000Z0EF

8 0 R6 (OPT) RES, 0603

Hardware: For Demo Board Only

1 9 E1 TO E9 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 E10 (OPT) TESTPOINT, TURRET, 0.094"

3 1 JP1 DOUBLE ROW HEADER 2 × 4 0.079" SULLINS, NRPN042PAEN-RC

4 1 XJP1 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

5 4 MH1 TO MH4 STAND-OFF, NYLON 0.50" TALL KEYSTONE, 8833(SNAP ON)

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dc2522af

DEMO MANUAL DC2522A

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

C C

B B

A A

ALL CAPACITORS ARE 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE 0603.

SUNCON

63CE22BS

(2MHz)

SYNC

SPREAD SPECTRUM

PULSE SKIPPING

BURST

VCC

EN/UV

18.2k

SYNC

1.00M

22µF

63V

2.2µH

XFL4020-222MEC

GND

TR/SS

47µF

10V

1210

C11

1µF

50V

0805

0.01µF

C10

4.7µF

50V

1206

(Opt)

E8 PG

49.9k

JP1

1 2

VOUT

5V / 2A

GND

10pF

182k

1.00M

0 2010

4.7µF

50V

1206

VEMI

5.5V - 42V

FB1

4.7µF

50V

1206

C12

0.1µF

50V

LT8609S

VIN

SYNC

VCC

TR/SS

FB 13

PG 12

SW 5

GND

3GND

SW 6

GND

VIN

GND

1uF

E10

VIN

5.5V - 42V

GND

4.7µF

16V

0805

VOUT

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dc2522af

DEMO MANUAL DC2522A

 LINEAR TECHNOLOGY CORPORATION 2017

LT 0517 • 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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