Linear Technology DC1587 Guida rapida alla configurazione

dc1587f

DEMO MANUAL DC1587

DESCRIPTION

LTC3105EDD: Step-Up

DC/DC Converter with Power

Point Control and LDO Regulator

Demonstration circuit 1587A is a boost converter op-

timized for relatively high impedance, very low voltage

input power sources. It allows a user to quickly evaluate

the LTC3105 boost converter and LDO regulator. Capable

of operating with an input voltage as low as 250mV and

as high as 5V, the circuit features maximum power point

control (MPPC). Jumpers on the circuit board allow the

user to select several MPPC voltages, three boost output

voltages and three LDO regulator output voltages. Also

included are jumpers for shutdown and for selecting an

external pull-up voltage for the power good status output.

Terminals are provided for input and output connections, 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.

PARAMETER CONDITION VALUE

Start-Up Input Voltage No Load, RMPPC = 22k, Supply ESR = 0.5Ω, See Section 3 250mV Typical

Input Voltage Range After Start-Up 0.2V to 5V

Maximum Boost Output Current VIN = 2V, VOUT = 5V, MPPC = 2V, Resistive Load 125mA

1.8V Boost Output Voltage VIN = 1.5V, 100Ω Load 1.8V ±3%

3.3V Boost Output Voltage VIN = 1.5V, 100Ω Load 3.3V ±3%

5V Boost Output Voltage VIN = 1.5V, 100Ω Load 5V ±3%

1.5V LDO Output Voltage VIN = 1.5V, 500Ω Load 1.5V ±3%

2.2V LDO Output Voltage VIN = 1.5V, 500Ω Load 2.2V ±2%

3V LDO Output Voltage VIN = 1.5V, 500Ω Load 3V ±3%

PERFORMANCE SUMMARY

(TA= 25°C)

power good output and external power good supply input,

shutdown input, and provisions for external MPPC resistor

and MPPC diode input.

This demonstration board is especially designed for low

power solar cell applications. The LTC3105 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.

Design ﬁles for this circuit board are available at

http://www.linear.com/demo

QUICK START PROCEDURE

Equipment required toevaluate the LTC3105 demonstration

circuit include a low voltage bench power supply, digital

voltmeters and suitable load resistors. Refer to Figure 1

for proper measurement equipment setup and follow the

procedure below.

1. Begin by placing jumpers in the following positions.

JP4

PGOOD

JP1

BOOST

JP3

LDO

JP2

MPPC

JP5

SHDN

VPGOOD 5V 3V 0.4V OFF

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dc1587f

DEMO MANUAL DC1587

QUICK START PROCEDURE

2. With the power off, connect a low voltage adjustable

power supply and three voltmeters as shown in Figure1

(ammeters are optional). Switch the power supply on

and adjust the voltage to approximately 450mV, and

move the JP5 jumper to the ON position. With no load

resistor on either output, verify that the BOOST and LDO

output voltages are within the speciﬁcations shown in

Table 1. Increase the input voltage to 1.5V and connect

suitable load resistors to the output terminals to verify

the output voltages under load. The maximum Boost

output current is dependant on VIN and the maximum

LDO output current is 6mA

Maximum power point control (MPPC) prevents the

converter from pulling the input supply voltage down

below a preset voltage level when the maximum input

supply current is reached. The converter does this by

dynamically reducing the converter’s output voltage

and current as the input voltage begins to drop due

to the input power source current limitations. Without

MPPC, a converter would pull the input power source

down to near 0V, resulting in near zero output power.

MPPC is especially useful with power sources that have

relatively high or variable source impedances such as

solar cells and other energy harvesting devices. The

following exercise is to illustrate the MPPC function.

To demonstrate the MPPC function, place a 10Ω, 1W

resistor in series with the demo board input terminal

(VIN) to simulate a high impedance power source. Move

jumper JP2 (MPPC) to the 2V position and jumpers JP1

and JP3 to the 5V and 3V positions respectively and

connect voltmeters to measure VIN and boost VOUT.

With the power supply set to 3.5V, apply voltage to the

input. With an adjustable load on the boost output,

begin increasing the load on the 5V output.

Figure 1. Proper Measurement Equipment Setup

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dc1587f

DEMO MANUAL DC1587

QUICK START PROCEDURE

Figure 3. Correct Method For Measuring

Input or Output Voltage Ripple

Figure 2. Maximum Power Point Control Programmed for 2V,

Operating from a High Impedance Input Power Source (10Ω)

As the output load current increases, the voltage on

VIN decreases due to the 10Ω input resistor. Figure2

shows VIN, VOUT and PGOOD voltages as the load

current is increased over a 2 second time period with

the MPPC programmed for 2V. The output remains at

a regulated 5V until the input voltage drops to the 2V

MPPC threshold. The MPPC prevents the input voltage

from dropping below 2V by reducing the output volt-

age. Without MPPC, the output voltage would drop to

near 0V resulting in zero output power. Connecting the

MPPC pin to GND will disable the MPPC function. Also

shown in Figure 1 is the Power Good (PGOOD) signal

that pulls low when the Boost output voltage drops

10% below the programmed value.

minal and ground. Connect a resistor of approximately

0.5Ω between the supply output and VIN. Adjust the

supply to approximately 250mV to 300mV and verify

that the boost output is in regulation. Since this DC/DC

converter is designed to operate from relatively high

impedance power sources, some source resistance is

neccessary for proper low voltage start-up. At very low

input voltage, excessive input current may result unless

there is some source resistance.

4. Additional demo board features include the following.

Jumper JP4 allows the PGOOD open drain FET pull-up

resistor to be connected to the LDO output voltage or

to an external voltage applied to the VPGOOD termi-

nal. The converter can be shutdown by pulling SHDN

terminal low. MPPC jumper allows the user to select

several preset MPPC voltages or select the DIODE ter-

minal when using diodes located near the solar panel

for MPPC temperature tracking. A small circular pad

on the board allows the LTC3105 AUX pin to be probed

when evaluating the circuit. Do not connect a load to

this pad.

VIN (V)

3.5

2.5

3.0

2.0

1.5

BOOST VOUT (V)

2 SECONDS

dc1587 F02

VOUT (2V/DIV)

LOAD CURRENT

(20mA/DIV)

PGOOD SIGNAL

VIN

3. To verify very low voltage start-up (250mV to 300mV)

it is necessary to do the following; remove jumper JP2

and add an external 22k resistor between the MPPC ter-

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dc1587f

DEMO MANUAL DC1587

PARTS LIST

ITEM QUANTITY REFERENCE PART DESCRIPTION MANUFACTURER, PART NUMBER

Required Circuit Components

1 1 C1 Capacitor, X5R, 10μF, 6.3V, 10%, 0805 AVX, 08056D106KAT2A

2 1 C3 Capacitor, X5R, 10μF, 16V, 10%, 0805 Taiyo Yuden, EMK212BJ106KG-T

3 1 C5 Capacitor, NPO, 33pF, 25V, 5%, 0402 AVX, 04023A330JAT2A

4 1 C8 Capacitor, X5R, 1μF, 16V, 10%, 0603 AVX, 0603YD105KAT2A

5 1 L1 Inductor, 10μH Sumida, CDRH3D18NP-100N

6 1 R1 Resistor, Chip, 392k, 1/16W, 1%, 0402 Vishay, CRCW0402392KFKED

7 1 R4 Resistor, Chip, 499k, 1/16W, 1%, 0402 Vishay, CRCW0402499KFKED

8 1 R6 Resistor, Chip, 40.2k, 1/16W, 1%, 0402 Vishay, CRCW040240K2FKED

9 1 R10 Resistor, Chip, 100k, 1/16W, 1%, 0402 Vishay, CRCW0402100KFKED

10 1 U1 IC, LTC3105EDD, 3mm ×3mm DFN Linear Technology, LTC3105EDD

Additional Circuit Components

1 0 C2 Tantalum, OPT

2 1 C4 Capacitor, X5R, 1μF, 16V, 10%, 0805 AVX, 0805YD105KAT2A

3 1 C6 Capacitor, NPO, 33pF, 25V, 5%, 0402 AVX, 04023A330JAT2A

4 1 C7 Capacitor, X5R, 4.7μF, 16V, 10%, 0805 Taiyo Yuden, EMK212BJ475MG-T

5 1 C10 Capacitor, X7R, 10nF, 50V, 10%, 0603 AVX, 06035C103KAT2A

6 1 R2 Resistor, Chip, 750k, 1/16W, 1%, 0402 Vishay, CRCW0402750KFKED

7 1 R3 Resistor, Chip, 845k, 1/16W, 1%, 0402 Vishay, CRCW0402845KFKED

8 1 R5 Resistor, Chip, 0, 0402 Vishay, CRCW04020000JKED

9 1 R7 Resistor, Chip, 200k, 1/16W, 1%, 0402 Vishay, CRCW0402200KFKED

10 1 R8 Resistor, Chip, 402k, 1/16W, 1%, 0402 Vishay, CRCW0402402KFKED

11 1 R9 Resistor, Chip, 549k, 1/16W, 1%, 0402 Vishay, CRCW0402549KFKED

12 1 R11 Resistor, Chip, 274k, 1/16W, 1%, 0402 Vishay, CRCW0402274KFKED

13 1 R12 Resistor, Chip, 1.1M, 1/16W, 1%, 0402 Vishay, CRCW04021M10FKED

Hardware

1 12 E1-E12 Testpoint, Turret, 0.095" Mill-Max, 2501-2-00-80-00-00-07-0

2 2 JP4, JP5 0.079 Single Row Header, 3-Pin Samtec, TMM-103-02-L-S

3 1 JP2 2mm Double Row Header 4mm ×2mm Samtec, TMM-104-02-L-D

4 2 JP1, JP3 2mm Double Row Header 2mm ×3mm Samtec, TMM-103-02-L-D

5 5 JP1-JP5 Shunt Samtec, 2SN-BK-G

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dc1587f

DEMO MANUAL DC1587

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 representation

that the interconnection of its circuits as described herein will not infringe on existing patent rights.

SCHEMATIC DIAGRAM

D D

C C

B B

A A

CDRH3D18NP-100N

MPPC

0.4V

DIODE

VPGOOD

VLDO

PGOOD SHDN

OFF

0805

BOOST

1.8V

3.3V

LDO

1.5V

2.2V

1.8V / 3.3V / 5V

1.5V / 2.2V / 3V

@6mA

0805

0805 0805

0.2V - 5V

2. INSTALL SHUNTS AS SHOWN.

1. ALL RESISTORS ARE IN 0402

ALL CAPACITORS ARE IN 0402

NOTE: UNLESS OTHERWISE SPECIFIED

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E12

GND

E12

GND

1uF

16V

1uF

16V

200K

VPGOOD

549K

E10

SHDN

E10

SHDN

JP2JP2

1 2

3 4

5 6

4.7uF

16V

4.7uF

16V

40.2K

499K

10uH

R12

1.1M

R12

1.1M

R10

100K

R10

100K

402K

JP4JP4

C10

10nF

C10

10nF C6

33pF

R11

274K

R11

274K

750K

845K

GND

+VIN

GND

JP1JP1

1 2

3 4

5 6

JP5JP5

1uF

16V

1uF

16V

BOOST OUTPUT

33pF

Exposed Pad

Solder Side

LTC3105EDD

Exposed Pad

Solder Side

LTC3105EDD

FB 1

SW 7

PGOOD

VIN

GND

AUX 10

SHDN

FBLDO 3

VOUT 9

LDO 2

MPPC

E11

DIODE

E11

DIODE

TANT

(OPT.)

TANT

(OPT.)

392K

JP3JP3

1 2

3 4

5 6

GND

10uF

6.3V

10uF

6.3V

10uF

16V

10uF

16V

MPPC

LDO OUTPUT

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

dc1587f

DEMO MANUAL DC1587

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 1210 • 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 direc-

tive 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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