Linear Technology DC1831A Manuale utente

dc1831af

DEMO MANUAL DC1831A

DESCRIPTION

LT3763

High Power Constant Current,

Constant Voltage Synchronous

Buck Controller

Demonstration circuit 1831A is a high power constant

current, constant voltage synchronous buck controller

featuring the LT

3763. The input of the demo board is

up to 60V. The output is optimized for 10V, 10A as a

LED driver. As an LED driver, the output current is being

regulated until the output voltage reaches a programmed

voltage limit. The voltage limit on the demo board is set to

around 15V by R11 and R14. The load to be used with this

demo board is high current LEDs or laser diodes. Smaller

LEDs may not be able to handle the high current, even for

a short period of time. It is necessary to mount the LED

load on a proper heat sink. A fan may become necessary

to avoid exceeding LED’s maximum temperature rating.

The input voltage range of the LT3763 itself is 6V to 60V.

The demo board input range is 12V to 60V, therefore, the

demo board utilizes 80V MOSFETs. If an application has

a maximum input voltage of 48V, 60V MOSFETs such as

BSC100N06LS3, can be used for better efficiency at lower

voltage range. The typical efficiency of the demo board is

95% from a 24V input to a 10V, 10A load. The lower the

input voltage, thehigher the efficiencytends to befor a given

load. At an output power level of 100W, even a one percent

efficiency improvement is a big advantage in minimizing

temperature rise. If an efficiency measurement is needed

in an application, the output voltage must be measured

at the output capacitors instead of at the LED load. This

prevents cable loss from being counted as a loss of the

board. The LT3763 turns off unnecessary circuits during

PWM off period to minimize power losses. As a result,

efficiency in many PWM dimming applications is high.

In most applications, input voltage reaching the maximum

specification is a transient event. However, a fan helps the

circuit to stay cool if running at or near peak input voltage

at full load in steady state. If running in steady state at

or near maximum input voltage and full load is required,

please contact LTC applications engineering.

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.

The demo circuit 1831A achieves fast current rise time

from 0A to 10A. To see the real rise time, connecting wires

between the LED and the board should be as short as

possible to minimize the wire inductance and resistance.

The cathode of the LED should return to LED– with R17

populated with a resistor in a few mΩ. It is recommended

to measure the voltage on R17 with a short 50Ω coax cable

directly into a BNC connector on the oscilloscope. The

current can be calculated from the measured voltage. A

current probe adds more delays to the rise time so using

a current probe is not recommended. If fast rise time is

not required, the cathode of the LED can be connected to

GND as shown in Figure 2.

The LT3763 data sheet gives a complete description of

the part, operation and application information. The data

sheet must be read in conjunction with this quick start

guide for demo circuit 1831A.

Design files for this circuit board are available at

http://www.linear.com/demo

VIN (V)

EFFICIENCY (%)

100

DN1831A F01

90 20 30 40 60

LED CURRENT = 5A

LED CURRENT = 10A

Figure 1. Demo Board Efficiency

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DEMO MANUAL DC1831A

QUICK START PROCEDURE

Demonstration circuit 1831A is easy to set up to evalu-

ate the performance of the LT3763. Refer to Figure 2 for

proper measurement equipment setup and follow the

procedure below:

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

and GND. Note: make sure VIN is below 60V.

2. With power off, connect the LED load to VOUT and

GND (without PWM dimming) or VOUT and LED– (with

PWM dimming).

PERFORMANCE SUMMARY

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 12 60 V

VOUT Maximum Output Voltage 15 V

IOUT Output Current 9.4 10 10.6 A

fSW Switching Frequency 380 430 480 kHz

EFF Efficiency at DC IOUT = 10A, VOUT = 10V 95 %

3. When measuring input and output voltage, measure at

test points TP1 to TP4.

4. Turn on the power at the input.

5. Carefully evaluate other design parameters as needed.

(TA= 25°C)

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DEMO MANUAL DC1831A

QUICK START PROCEDURE

Figure 2. Proper Measurement Equipment Setup

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DEMO MANUAL DC1831A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 Cap., Alum, 33μF,100V, 10.3x10.3 Sun Elect., 100CE33FS

2 2 C2, C5 Cap., X7R, 2.2μF, 100V, 10%, 1210 Murata, GRM32ER72A225KE35L

3 1 C6 Cap., X7R, 1μF, 100V, 10%, 1206 Murata, GRM31CR72A105KA01L

4 1 C7 Cap., X7R, 0.22μF, 10V, 10%, 0603 Murata, GRM188R71A224KA01D

5 2 C8, C10 Cap., POSCAP, 68μF, 16V Sanyo, 16TQC68MYF

6 2 C9, C11 Cap., X7R , 22μF, 25V, 10%, 1210 Murata, GRM32ER71E226KE15L

7 1 C12 Cap., X5R, 22μF, 6.3V,10%, 0805 Murata, GRM21BR60J226ME39L

8 1 C13 Cap., C0G, 2nF, 50V, 5%, 0603 Murata, GRM1885C1H202JA01D

9 2 C14, C19 Cap., X7R, 1000pF, 50V, 10%, 0603 AVX, 06035C102KAT2A

10 1 C15 Cap., X7R, 10nF,16V, 0603 Murata, GRM188R71C103KA01D

11 1 C17 Cap., X7R, 5.1nF, 10%, 25V, 0603 Murata, GRM188R71E512KA01

12 1 D1 1.0A Schottky Diode, DFLS160 Diodes/Zetex, DFLS160-7

13 1 D2 2.0A Schottky Diode, DFLS260 Diodes/Zetex, DFLS260-7

14 1 L1 Inductor, 2.8μH WE., 7443551280

15 4 Q1, Q2, Q3, Q4 MOSFET Renesas, RJK0851DPB

16 1 Q5 MOSFET Infineon, BSC014N03LS G

17 1 R1 Res., Chip, 374k, 1%, 0603 Vishay, CRCW0603374KFKEA

18 1 R2 Res., Chip, 124k, 1%, 0603 Vishay, CRCW0603124KFKEA

19 6 R3, R5, R8, R24, R25, R27 Res., Chip, 100k, 1%, 0603 Vishay, CRCW0603100KFKEA

20 1 R4 Res., Chip, 0.005Ω, 1W, 1%, 2512 Vishay, WSL25125L000FEA

21 1 R7 Res., Chip, 45.3k, 1%, 0603 Vishay, CRCW060345K3FKEA

22 1 R11 Res., Chip, 5.62k, 1%, 0603 Vishay, CRCW06035K62FKEA

23 1 R12 Res., Chip, 680K, 1%, 0603 Vishay, CRCW0603680KFKEA

24 1 R14 Res., Chip, 487Ω, 1%, 0603 Vishay, CRCW0603487RFKEA

25 1 R15 Res., Chip, 30.9k, 1%, 0603 Vishay, CRCW060330K9FKEA

26 1 U1 I.C. LT3763EFE, 20-Pin TSSOP Linear Tech., LT3763EFE

Additional Demo Board Circuit Components

1 0 C3, C4 Cap., 1210, Opt

2 0 C16, C18, C20 Cap., 0603, Opt

3 2 R6, R17 Res., Chip, 0Ω, 2512 Vishay, CRCW25120000Z0EG

4 0 R9, R20, R21 Res., 1206, Opt

5 8 R10, R13, R16, R18, R19, R22,

R23, R26

Res., Chip, 0Ω, 0603 Vishay, CRCW06030000Z0ED

Hardware–For Demo Board Only

1 5 J1, J2, J3, J4, J5 Jack, Banana Keystone, 575-4

2 10 E1-E8, E10, E11 Testpoint, Turret, 0.094" Mill-Max, 2501-2-00-80-00-00-07-0

3 4 Stand-Off, Nylon 0.5" tall Keystone, 8833 (Snap On)

dc1831af

DEMO MANUAL DC1831A

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 DC1831A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 1012 • 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.:

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