Linear Technology DC1428A Guida rapida alla configurazione

dc1428af

DEMO MANUAL DC1428A

DESCRIPTION

LT3645

0.5A, 36V Step-Down

Regulator with LDO

Demonstration circuit 1428A features the LT

3645. The

circuit is designed to convert a 5V to 36V input source to

3.3V at 300mA and 2.5V at 200mA. JP1 and JP2 enable and

disable the 3.3V output and the 2.5V output respectively.

LDO only operates if both, EN/UVLO and EN2 are greater

than 1.2V. Demo board includes an optional resistor, R8,

for easy implementation of UVLO. The LT3645 data sheet

gives a complete description of the part, its operation and

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.

PERFORMANCE SUMMARY

application information. The data sheet must be read in

conjunction with this quick start guide for working on or

modifying the demo circuit 1428A.

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 5 36 V

3.3VOUT Buck Output Voltage Accuracy VIN = 5V to 36V, ILOAD = 500mA 3.226 3.3 3.374 V

2.5VOUT LDO Output Voltage Accuracy VIN = 5V to 36V, ILOAD = 200mA 2.444 2.5 2.556 V

Efficiency VIN = 5V, ILOAD = 500mA for Buck, 0mA for LDO 83 %

VIN = 5V, ILOAD = 300mA for Buck, 200mA for LDO 75 %

Buck VOUT Ripple VIN = 5V, ILOAD = 500mA 10 mV

LDO VOUT Ripple VIN = 5V to 36V, ILOAD = 200mA 1 mV

fSSwitching Frequency 750 kHz

dc1428af

DEMO MANUAL DC1428A

QUICK START PROCEDURE

Demonstration circuit 1428A is easy to set up to evaluate

the performance of the LT3645. Refer to Figures 1 and 2

for proper measurement equipment setup and follow the

procedure below:

To measure the input or output voltage ripple, care must

be taken to avoid a long ground lead on the oscilloscope

probe. Measure the input or output voltage ripple by touch-

ing the probe tip directly across the VIN or VOUT and GND

terminals. See Figure 2 for proper scope probe technique.

1. Place jumpers in the following position:

JP1 ON

JP2 ON

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

and GND. Apply 5V to input and 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.

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.

LOAD CURRENT (mA)

EFFICIENCY (%)

100 200 300 400 500

VIN = 7V

VIN = 12V

VIN = 24V

Efficiency VOUT = 3.3V

dc1428af

DEMO MANUAL DC1428A

Figure 1. DC1428A Proper Equipment Set-Up

Figure 2. Proper Input/Output Ripple Measurement Technique

GND

VOUT

dc1428af

DEMO MANUAL DC1428A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 Capacitor, X7R, 0.1μF, 10V, 10%, 0603 AVX, 0603ZC104KAT2A

2 1 C2 Capacitor, Tantalum, 10μF, 63V Suncon, 63CE10BS

3 1 C3 Capacitor, X7R, 1μF, 50V, 10%, 1206 Murata, GCM31MR71H105KA55L

4 1 C4 Capacitor, X5R, 10μF, 6.3V, 0805 AVX, 08056D106MAT2A

5 1 C5 Capacitor, X5R, 2.2μF, 6.3V, 10%, 0603 AVX, 06036D225KAT2A

6 1 D1 Schottky Barrier Rect., 1A, power, DI323 Diodes Inc. PD3S140

7 1 L1 Inductor 10μH Taiyo Yuden, NRH3012T100MN

8 2 R1, R4 Resistor, 10k, 1/16W, 5%, 0402 Vishay, CRCW040210K0JNED

9 1 R2 Resistor, 31.6k, 1/16W, 1%, 0402 Vishay, CRCW040231K6FKED

10 2 R3, R7 Resistor, 10k, 1/16W, 1%, 0402 Vishay, CRCW040210KFKED

11 1 R5 Resistor, 21.5k, 1/16W, 1%, 0402 Vishay, CRCW040221K5FKED

12 1 R6 Resistor, 100k, 1/16W, 5%, 0402 Vishay, CRCW04021003JKED

13 1 U1 IC, LT3645EMSE Linear Technology, LT3645EMSE

14 1 Fab, Printed Circuit Board Demo Circuit 1428A

Additional Demo Board Circuit Components

1 2 C11, C12 Capacitor, X7R, 0.1μF, 10V, 10%, 0603 AVX, 0603ZC104KAT2A

2 0 C13 (OPT) Capacitor, 0402

3 0 R8 (OPT) Resistor, 0402

Hardware/Components (For Demo Board Only)

1 7 E1-E7 Testpoint, Turret, 0.094" Mill-Max, 2501-2-00-80-00-00-07-0

2 2 JP1, JP2 Header, 3-Pin, 1 Row, 0.079CC Samtec, TMM-103-02-LS

3 2 XJP1, XJP2 Shunt, 0.079" Center Samtec, 2SN-BK-G

dc1428af

DEMO MANUAL DC1428A

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.

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dc1428af

DEMO MANUAL DC1428A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0611 • 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.:

DC1428A

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