Linear Technology LT3091EDE Quick setup guide

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DEMO MANUAL DC2276A

Description

LT3091EDE

–36V, 1.5A Negative Linear Regulator

with Programmable Current Limit

Demonstration circuit DC2276A is a 1.5A low dropout

negativelinearregulatorfeaturingtheLT

3091.This device

is designed for applications requiring negative output volt-

age, high current without a heat sink,output adjustability

to zero and low dropout voltage.

The LT3091 features fast transient response,high PSRR

andoutputnoiseaslowas18µVRMS.TheLT3091 generates

a wide output voltage range (0V to –32V) while maintain-

ing unity gain operation.This yields virtually constant

bandwidth,load regulation,PSRR and noise,independent

of the programmed output voltage.

The LT3091 supplies 1.5A at a typical dropout voltage of

300mV. Operating quiescent current is nominally 1.2mA

and drops to <<1µA in shutdown.A single resistor adjusts

the LT3091’s precision programmable current limit.The

LT3091’s positive or negative current monitor either

BoarD photo

sources a current (0.25mA/A)or sinks a current (0.5mA/A)

proportional to output current.

Built-in protection includes reverse output protection,

internal current limit with foldback and thermal shutdown

with hysteresis.

DC2276A uses the LT3091EDE which is a 14-lead (4mm

x 3mm) plastic DFN package with an exposed pad on the

bottom side of the IC for better thermal performance.

These features make DC2276A an ideal circuit for surface-

mount power supplies,rugged industrial power supplies,

low output voltage supplies and as a post regulator for

switching supplies.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2276A

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.

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DEMO MANUAL DC2276A

performance summary

Specifications are at TA= 25°C

CONDITIONS IOUT

VIN (V) VOUT (V)

MIN* TYP MAX MIN TYP MAX

Shunt at –1.25V for JP1 –10mA –36.0 –1.55 –1.30 –1.25 –1.20

–1.5A –2.75 –1.55 –1.30 –1.25 –1.20

Shunt at –2.5V for JP1 –10mA –36.0 –2.80 –2.6 –2.5 –2.4

–1.5A –4.0 –2.80 –2.6 –2.5 –2.4

Shunt at –5.0V for JP1 –10mA –36.0 –5.30 –5.2 –5.0 –4.8

–1.5A –6.50 –5.30 –5.2 –5.0 –4.8

Shunt at –12V for JP1 –10mA –36.0 –12.3 –12.5 –12.0 –11.5

–1.5A –13.5 –12.3 –12.5 –12.0 –11.5

Shunt at –15V for JP1 –10mA –36.0 –15.3 –15.6 –15.0 –14.4

–1.5A –16.5 –15.3 –15.6 –15.0 –14.4

* The minimum input voltage for –1.5A load current is set by the 50°C temperature rise of LT3091 on the demo circuit without forced-air cooling. Lower

input voltage can be reached if larger copper area or forced-air cooling is applied. The output current is also limited by the differential voltage of input

and output voltage, please refer the data sheet for details.

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DEMO MANUAL DC2276A

Quick start proceDure

DC2276A is easy to set up to evaluate the performance

of the LT3091. Refer to Figure 1 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.Measure the input or output voltage

ripple by touchingthe probe tip directlyacross the terminals

of the input or output capacitors.See Figure 2 for proper

scope probe technique.

1. Use JP2 to set the desired output voltage.

2. Put JP4 on ON position.

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

and GND.

4. Turn on the power at the VIN.

NOTE: Make sure that the VIN voltage does not exceed

–36V.

5. Check for the proper output voltages:

NOTE: If there is no output,temporarily dis-connect

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

or is shorted.

6. Once the proper output voltages are established,adjust

the loads within the operating range and observe the out-

put voltage regulation,efficiency and other parameters.

NOTE: Make sure that the power dissipation is limited

below the thermal limit.

–

LOAD

–

POWER SUPPLY

Figure1. Test Procedure Setup for DC2276A

OR V

OUT

GND

Figure2. Measuring Input or Output Ripple

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DEMO MANUAL DC2276A

positive or negative current monitor anD caBle Drop

compensation configuration

There are both positive and negative current monitors on

the LT3091.The configurations for these two monitors are

different.Pleasecheckfollowingtableforproperconfiguration.

When the positive current monitor is in use, JP1 needs

to be configured on ON position and JP3 needs to be

configured on +3V position.Meantime,a +3V external

power supply needs to be connected to +3V INPUT turret.

When the negative current monitor is in use, JP1 needs

to be configured on OFF position and JP3 needs to be

configured on IMONN ON position.There is no external

power supply needed.

Demo Circuit 2276A also can be configured to evaluate the

cable drop compensation on the LT3091. Note that cable

drop compensation is only using negative current monitor

configuration. JP1, JP3 and R11 shall be configured. JP1

needs to be configured on OFF position. JP3 needs to be

configured on CABLE DROP COMP position. R11 needs

be replaced by a calculated value which has the following

relationship with the total output cable impedance (RCBL)

below. R11 and RCBL are both in Ω: R11 = RCBL •2 k.

JP1 (IMONP) JP3 (IMONN) R11(Ω)

Positive Current Monitor ON +3V 0

Negative Current Monitor OFF IMONN ON 0

Cable Drop Compensation OFF CABLE DROP COMP RCBL(Ω) •2 k

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DEMO MANUAL DC2276A

thermal image

Figure3. Temperature Rise at 2.25W Dissipation (VIN = –2.75V, VOUT = –1.25V, IOUT = –1.5A)

An example thermal image shows the temperature

distribution on the PC board.The test is done in still air

at room temperature with 2.25W power dissipation in

the LT3091 IC.This gives an IC case-to-ambient thermal

resistance of θCA = 22°C/W on the demo circuit.The IC,

at its highest point,reaches 75°C, at –2.75VIN, –1.25VOUT

and 1.5A load current.

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DEMO MANUAL DC2276A

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C1,C2 CAP., X5R, 10µF, 50V, 10%, 1206 MURATA, GRM31CR61H106KA12L

2 1 C3 CAP., X7R, 0.1µF, 25V, 10%, 0603 MURATA, GRM188R71E104KA01D

3 1 C4 CAP., ALUM, 10µF, 50V, 20% SUN ELECT, 50CE10BSS

4 1 C5 CAP., X7R, 1µF, 10V, 10%, 0603 MURATA, GRM188R71A105KA61D

5 1 R1 RES., CHIP, 5.1k, 1/10W, 5%, 0603 VISHAY, CRCW06035K10JNEA

6 1 R2 RES., CHIP, 49.9k, 1/8W, 1%, 0805 VISHAY, CRCW080549K9FKEA

7 1 R3 RES., CHIP, 24.9k, 1/10W, 1%, 0603 VISHAY, CRCW060324K9FKEA

8 1 R4 RES., CHIP, 49.9k, 1/10W, 1%, 0603 VISHAY, CRCW060349K9FKEA

9 1 R5 RES., CHIP, 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA

10 1 R6 RES., CHIP, 243k, 1/10W, 1%, 0603 VISHAY, CRCW0603243KFKEA

11 1 R7 RES., CHIP, 301k, 1/10W, 1%, 0603 VISHAY, CRCW0603301KFKEA

12 1 R9 RES., CHIP, 1.58k, 1/10W, 1%, 0603 VISHAY, CRCW06031K58FKEA

13 1 R10 RES., CHIP, 806, 1/10W, 1%, 0603 VISHAY, CRCW0603806RFKEA

14 1 R11 RES., CHIP, 0, 1/10W, 0603 VISHAY, CRCW06030000Z0EA

15 1 U1 I.C., REGULATOR, DFN14 LINEAR TECH, LT3091EDE#PBF

Additional Demo Board Circuit Components

16 0 C5 (OPT) CAP., OPTION, 1206

17 0 R8, R12, R13 (OPT) RES., OPTION, 0603

Hardware: For Demo Board Only

18 8 E1-E8 TESTPOINT, TURRET, .094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

19 1 JP1 HEADER 2x2 PIN 0.079 DOUBLE ROW WURTH ELEKTRONIK, 62000421121

20 1 JP2 HEADER 6x2 PIN 0.079 DOUBLE ROW SAMTEC, TMM-106-02-L-D

21 2 JP3-JP4 HEADER 3x2 PIN 0.079 DOUBLE ROW WURTH ELEKTRONIK, 62000621121

22 4 XJP1-XJP4 SHUNT, 0.079" CENTER WURTH ELEKTRONIK, 60800213421

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DEMO MANUAL DC2276A

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 DC2276A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2015

LT 0915 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) 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

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