Linear DC1194A Guide de configuration rapide

dc1194af

DEMO MANUAL DC1194A

DESCRIPTION

LTM8020

36V, 200mA DC/DC

µModule Regulator

Demonstration circuit DC1194A features the LTM

8020, a

200mA DC/DC step-down μModule

regulator. The board

is preset to deliver a 3.3V output at up to 200mA load

current from an input voltage of up to 36V. The output

voltage may be modified by simply changing one resis-

tor. The LTM8020 data sheet must be read in conjunction L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of

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

with this demo manual prior to working on or modifying

demo circuit DC1194A.

Design files for this circuit board are available at

http://www.linear.com/demo

BOARD PHOTO

PERFORMANCE SUMMARY

PARAMETER CONDITIONS / NOTES VALUE

Input Voltage Range VOUT = 3.3V, Device 0perating 4.5V to 36V

Output Voltage, VOUT R1 = 30.1k 3.3V

Maximum Output Current 200mA

Efficiency VIN = 5V, VOUT = 3.3V, IOUT = 100mA 85% (See Figure 2)

Light Load Power Loss VIN = 12V, VOUT = 3.3V, IOUT = 100μA 400μW

dc1194af

DEMO MANUAL DC1194A

LOAD CURRENT (mA)

3.0

INPUT VOLTAGE (V)

3.5

4.0

4.5

5.0

50 100 150 200

DC1194A F03

5.5

6.0

SHDN CONTROL

TO START

TO RUN

DESCRIPTION

Figure 3. LTM8020EV Typical Minimum VIN 3.3VOUT

IOUT (mA)

POWER LOSS (mW)

1000

100

0.1

0.1 10 100 1000

DC1194A F02

5VIN

12VIN

24VIN

36VIN

Figure 2. LTM8020EV Power Loss 3.3VOUT

ILOAD (mA)

EFFICIENCY (%)

0.1 10 100 1000

DC1194A F01

5VIN

12VIN

24VIN

36VIN

Figure 1. LTM8020EV Efficiency 3.3VOUT

dc1194af

DEMO MANUAL DC1194A

QUICK START PROCEDURE

Figure 4. Proper Measurement Equipment Setup

Demonstration circuit 1194A is easy to set up to evalu-

ate the performance of the LTM8020. Refer to Figure 4

for proper measurement equipment setup and follow the

procedure below:

NOTE: Do not hot-plug the VIN terminal at high input

voltage. The absolute maximum voltage on VIN is 40V

and hot-plugging a power supply through wire leads to

the demonstration circuit can cause the voltage on the

extremely low ESR ceramic input capacitor to ring to

twice its DC value. In order to protect the IC, a higher

ESR aluminum electrolytic capacitor is placed at the input

terminals. This may protect against some, but not all, input

transients due to hot-plugging with a power supply. See

Application Note 88 for more details.

1. Connect the power supply (with power off), load, and

meters as shown in Figure 4.

2. After all connections are made, turn on input power

and verify that the output voltage is 3.3V.

NOTE: If the output voltage is too low, temporarily

disconnect the load to make sure that the load is not

set too high.

3. Once the proper output voltage is established, adjust

the load within the operating range and observe the

output voltage regulation, ripple voltage, efficiency and

other parameters.

–

OPTIONAL

DC1194A F04

–+

LOAD

dc1194af

DEMO MANUAL DC1194A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER’S PART NUMBER

Required Circuit Components

1 1 C1 CAP, 1210 2.2μF 10% 50V X7R TDK C3225X7R1H225K

5 1 R1 RES, 0402 301k 1% 1/16W VISHAY CRCW0402301KFKED

6 1 R2 RES, 0402 100k 5% 1/16W VISHAY CRCW0402100KJNED

7 1 U1 IC, MODULE LINEAR TECH. LTM8020EV#PBF

Optional Electrical Components

2 1 C2 CAP, 0805 22μF 20% 6.3V X7R TAIYO YUDEN JDK212BJ226MD-T

3 1 C3 CAP, 10μF 20% 50V ALUM SANYO 50CE10BJ (Now SUNCON 50CE10BJ)

Hardware

4 6 E1, E2, E3, E4, E5, E6 TURRET MILL-MAX 2501-2-00-80-00-00-07-0

dc1194af

DEMO MANUAL DC1194A

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

dc1194af

DEMO MANUAL DC1194A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0311 • 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

Mouser Electronics

Authorized Distributor

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

Analog Devices Inc.:

DC1194A

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