Linear Technology DC1721B-B Guida rapida alla configurazione

dc1721bf

DEMO MANUAL

DC1721B-A/DC1721B-B

DESCRIPTION

LTC4000EGN(-1)/LTC3789EGN

14.6V, 5A Battery Charger with

6VIN to 36VIN Buck-Boost Converter

Demonstrationcircuit1721B is a 14.6V, 5A batterycharger

and PowerPath™ manager with 6VIN to 36VIN buck-boost

converter featuring the LTC4000/LTC3789, targeted at

4-cell LiFePO4applications. The output of this demo board

was specifically tailored for a Tenergy 10A-hour battery,

P/N 30207. Other voltages can be set by changing ROFB2

and RBFB2. The desired nominal voltage can be accurately

trimmedbyusingtrimresistors R42 and R43. For example,

for 14.4V battery float voltage, change ROFB2 and RBFB2

to 86.6k, and add 7.5M at R42 and R43 for greater set

point accuracy.

This circuit was designed to demonstrate the high levels of

performance, efficiency, and small solution size attainable

using these ICs in a buck-boost converter battery charger,

intelligent PowerPath manager, and power supply. It oper-

ates at 400kHz and produces a regulated 5A/14.6V battery

charger output as well as a system output of up to 6.25A

from an input voltage range of 6V to 36V: suitable for a

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

PERFORMANCE SUMMARY

wide variety of portableapplications including instruments,

industrial equipment, power tools, and computers. It has

a total footprint area of 12.4cm2(3.6cm2for the LTC4000

circuit only). Synchronous rectification helps to attain

efficiency exceeding 96% at full load and nominal input.

DC1721B-A: The LTC4000 has an input current limit/

regulation loop that prevents overloading sources with

limited output capability.

DC1721B-B: The LTC4000-1 instead has an input voltage

regulation loop for Maximum Power Point (MPP) control.

MPP control extracts near maximum power from high

impedance sources such as solar panels, wind turbines,

or fuel cells.

Design files for this circuit board are available at

http://www.linear.com/demo

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 636V

VIN-MP1Input Regulation Voltage This Is the Input Voltage Lower Limit Set by the LTC4000-1 11.85 V

IIN2Input Current Limit 11 A

VFLOAT Battery Float Voltage 14.4 14.6 14.8 V

Output Regulation Line and Load (6V to 36V, 0A to 5A) ±0.05 %

IBAT Battery Charge Current 5.0 A

VOUT-SYS System Output Voltage 12.3 14.6 15.5 V

IOUT-SYS System Output Current Range 0 6.25 A

FSW Switching (Clock) Frequency 400 kHz

VOUT-SYS P-P System Output Ripple VIN = 24V, IOUT-SYS = 5A (20MHz BW) 50 mVP-P

POUT/PIN System Output Efficiency (See Figure 3) VIN = 24V, IOUT-SYS = 5A 96.5 %

Approximate Size Component Area ×Top Component Height 12.4cm2×0.40cm

1DC1721B-B (LTC4000-1) Only,

2DC1721B-A (LTC4000) Only

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dc1721bf

DEMO MANUAL

DC1721B-A/DC1721B-B

QUICK START PROCEDURE

Demonstration circuit 1721 is easy to set up to evaluate the

performance of the LTC4000/LTC3789. Refer to Figure1

for proper measurement equipment setup and follow the

procedure below:

WARNING:BATTERIESARE POTENTIALLY DANGER-

OUS HIGH ENERGY SOURCES. IMPROPER CON-

NECTION, OVERCHARGE, OR RAPID DISCHARGE

COULD RESULT IN EXPLOSION AND/OR FIRE.

NOTE. When measuringthe outputvoltage ripple, caremust

be taken to avoid a long ground lead on the oscilloscope

probe. Measure the output voltage ripple by touching the

probe tip and ground ring directly across the last output

capacitor as shown in Figure 1.

1. Set MODE jumper to CCM. Set CHARGE jumper to

DISABLE.

2. Set an input power supply that is capable of 6V to 36V

and 12A to 24V. Then turn off the supply.

3. With power off, connect thesupply to theinput terminals

VIN and GND.

NOTE.

a. Input voltages lower than 6V can keep the converter

from turning on due to the undervoltage lockout feature

of the LTC4000.

b. Ifefficiencymeasurementsaredesired, refer to Figure1

for test setup.

4. Turn on the power at the input.

NOTE. Make sure that the input voltage never exceeds 36V.

5. Check for the proper VOUT-SYS of 15.3V. Turn off the

power at the input.

6. Once the proper output voltages are established, con-

nect a variable load capable of sinking 7A at 16V to the

output terminals VOUT-SYS and GND. Set the current

for 0A.

7. Turn on the power at the input.

NOTE. If there is no output, temporarily disconnect the

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

8. Once the proper VOUT-SYS is again established, adjust

the load and/or source within the operating range and

observe the output voltage regulation, ripple voltage,

efficiency, input and output current limit, and other

desired parameters.

9. Turn off the power at the input.

10.Connect the output load and meters to the BAT output.

11.Set CHARGE jumper to ENABLE.

12.Turn on the power at the input.

13.Once the proper VOUT-SYS is again established, adjust

the load and/or source within the operating range and

observe the battery float voltage regulation and other

desired parameters.

14.Set the load to constant voltage mode to more easily

observe charge current and trickle charge current.

15.(DC1721B-B 0NLY) In order to observe MPP operation,

add a 0.25Ω to 0.3Ω, 10W resistor in series with the

DC source and set the source to 13V. Use a constant

voltage or constant resistance load characteristic. As

the load is increased, the input voltage will be regulated

at the MPP regulation point (11.75V) by reducing the

output of the DC/DC converter.

NOTE. Operation in the Instant-On region (VOUT < 12.5V)

may engage thermal limit circuit to protect Q7 in the linear

region.

NOTE.Theoptionalthermallimitcircuit for Q6 (Q9, RNTC3,

R55-59, and U4) is included to protect Q6 in case of an

extended short circuit on VOUT-SYS underadverse thermal

conditions (TA> 40°C). It may not be needed in applica-

tions with less severe thermal conditions, lower current

available to VOUT-SYS, or where continuous short-circuit

protection on VOUT-SYS is not required.

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dc1721bf

DEMO MANUAL

DC1721B-A/DC1721B-B

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

Figure 2. Proper Noise Measurement Setup

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dc1721bf

DEMO MANUAL

DC1721B-A/DC1721B-B

QUICK START PROCEDURE

Figure 4. LTC4000/LTC3789 System Block Diagram, DC1721B-A

Rsense-input

A10

Rsense-charge

DC - DC CONVERTER

ITH

LTC4000 Gm

LTC3789

NOT ON THE BOARD

GNDGND

RC1RC1

CC1CC1

VOUT-SYSVOUT-SYS

BATBAT

VINVIN

10nF10nF

CC2CC2

Figure 3. Efficiency from VIN to VOUT-SYS

DC1721A LTC4000 and

LTC3789 Efficiency

IOUT (A)

0.5

EFFICIENCY (%)

100

80 2.5 4.51.5 3.5 5.5

VIN = 36V

VIN = 24V

VIN = 6V

VIN = 15V

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dc1721bf

DEMO MANUAL

DC1721B-A/DC1721B-B

Figure 5. LTC4000-1/LTC3789 System Block Diagram, DC1721B-B

A10

Rsense-charge

DC - DC CONVERTER

ITH

LTC4000-1 Gm

LTC3789

NOT ON THE BOARD

GNDGND

RC1RC1

CC1CC1

VOUT-SYSVOUT-SYS

BATBAT

VINVIN

10nF10nF

CC2CC2

QUICK START PROCEDURE

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dc1721bf

DEMO MANUAL

DC1721B-A/DC1721B-B

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC1721B-A Required Circuit Components

1 4 C1, C2, C16, C17 CAP., X5R, 22μF, 25V, 10% 1210 AVX, 12103D226KAT2A

2 2 C4, C22 CAP., X7R, 0.22μF, 16V, 10% 0603 AVX, 0603YC224KAT2A

3 4 C5, C6, C9, C25 CAP., X7R, 3.3μF, 50V, 10% 1210 AVX, 12105C335KAT2A

4 1 C10 CAP., X5R, 2.2μF, 6.3V, 20% 0603 AVX, 06036D225MAT2A

5 1 C12 CAP., NPO, 390pF, 100V, 5% 1206 AVX, 12061A391JAT2A

6 1 C13 CAP., NPO, 1800pF, 100V, 5% 1206 AVX, 12061A182JAT2A

7 2 C15, CIN CAP., X7R, 1μF, 50V, 10% 1210 AVX, 12105C105KAT2A

8 1 C18 CAP., X7R, 10μF, 10V, 10% 1206 AVX, 1206ZC106KAT2A

9 1 C19 CAP., C0G, 1000pF, 25V, 5% 0603 AVX, 06033A102JAT2A

10 2 C24, CBIAS CAP., X7R, 1μF, 16V, 10% 0603 AVX, 0603YC105KAT2A

11 2 C34, C35 CAP., X7R, 0.01μF, 25V, 5% 0603 AVX, 06033C103JAT2A

12 3 CC2, C14, CTMR CAP., X7R, 0.1μF, 50V, 10% 0603 AVX, 06035C104KAT2A

13 2 CIN1, CIN2 CAP., ALUM., HVH, 56μF, 50V SUN Electronics, 50HVH56M

14 1 CL CAP., X5R, 2.2μF, 25V, 20% 0805 AVX, 08053D225MAT2A

15 2 COUT1, COUT2 CAP., OS-CON, 150μF, 20V, 20% SANYO, 20SVP150M

16 1 CSS CAP., X7R, 0.022μF, 50V, 10%, 0603 AVX, 06035C223KAT2A

17 1 D2 DIODE, SWITCH 75V 350MW SOT23-3 DIODES/ZETEX, BAS16-7-F

18 1 D10 DIODE, ZENER 5.6V 500MW SOD-123 DIODES/ZETEX, BZT52C5V6-7-F

19 2 D4, D7 DIODE, SCHOTTKY 1A 60V POWERDI123 DIODES/ZETEX, DFLS160-7

20 2 D5, D6 DIODE, SCHOTTKY 40V 2A SMA DIODES/ZETEX, B240A-13-F

21 1 D9 DIODE, ZENER 3V 500MW SOD-323 DIODES/ZETEX, BZT52C3V0S-7-F

22 1 F1 FUSE, 6.3A 32V T-LAG 1206 SMD COOPER BUSSMAN, 3216TD6.3-R

23 1 L1 INDUCTOR, 4.7μH TOKO, FDA1254-4R7M

24 2 Q2, Q4 MOSFET, N-Chan., 40V, POWERPAK-8 VISHAY, SiR422DP-T1-GE3

25 2 Q3, Q5 MOSFET, N-Chan., 20V, POWERPAK-8 VISHAY, SiR496DP-T1-GE3

26 2 Q6, Q7 MOSFET, P-Chan., 30V, POWERPAK-8 VISHAY, Si7135DP-T1-GE3

27 2 Q8, Q9 MOSFET, SMALL SIGNAL SOT23 ON SEMI., 2N7002LT1G

28 1 R1 RES., CHIP., 5.6Ω, 0.1W, 5% 0603 VISHAY, CRCW06035R60JNEA

29 2 R2, R18 SENSOR RES 0.008Ω 1W 2% 0815 SMD SUSUMU, RL3720WT-R008-G

30 4 R3, R4, R13, R14 RES., CHIP., 100Ω, 0.1W, 5%, 0603 VISHAY, CRCW0603100RJNEA

31 1 R5 RES., CHIP., 15Ω, 0.125W, 5% 0805 VISHAY, CRCW080515R0JNEA

32 2 R7, R49 RES., CHIP., 100k, 0.1W, 1% 0603 VISHAY, CRCW0603100KFKEA

33 2 R8, R11 RES., CHIP., 10Ω, 0.1W, 5% 0603 VISHAY, CRCW060310R0JNEA

34 2 R9, R10 RES., CHIP., 1.24k, 0.1W, 1% 0603 VISHAY, CRCW06031K24FKEA

35 1 R20 SENSOR RES 0.004Ω 1W 2% 0815 SMD SUSUMU, RL3720WT-R004-G

36 1 R21 RES., CHIP., 121k, 0.1W, 1% 0603 VISHAY, CRCW0603121KFKEA

37 6 R24, R48, R55, R60, RCX, RVM2 RES., CHIP., 10k, 0.1W, 1% 0603 VISHAY, CRCW060310K0FKEA

38 1 R28 RES., CHIP, 5.6Ω, 5%, 1206 VISHAY, CRCW12065R60JNEA

39 1 R29 RES., CHIP, 3.6Ω, 5%, 1206 VISHAY, CRCW12063R60JNEA

40 2 R44, R58 RES., CHIP., 38.3k, 0.1W, 1% 0603 VISHAY, CRCW060338K3FKEA

41 2 R50, R57 RES., CHIP., 20k, 0.1W, 1% 0603 VISHAY, CRCW060320K0FKEA

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dc1721bf

DEMO MANUAL

DC1721B-A/DC1721B-B

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

42 1 R56 RES., CHIP., 68.1k, 0.1W, 1% 0603 VISHAY, CRCW060368K1FKEA

43 1 RC1 RES., CHIP., 14.7k, 0.1W, 1% 0603 VISHAY, CRCW060314K7FKEA

44 1 RCL RES., CHIP., 24k, 0.1W, 5% 0603 VISHAY, CRCW060324K0JNEA

45 1 RCS SENSOR RES., 0.01Ω 1W 2% 0815 SMD SUSUMU, RL3720WT-R010-G

46 1 RFB1 RES., CHIP., 154k, 0.1W, 1% 0603 VISHAY, CRCW0603154KFKEA

47 1 RFB2 RES., CHIP., 8.06k, 0.1W, 1% 0603 VISHAY, CRCW06038K06FKEA

48 1 RIG RES., CHIP., 10M, 0.1W, 5% 0603 VISHAY, CRCW060310MJNEA

49 1 RIL RES., CHIP., 18.2k, 0.1W, 1% 0603 VISHAY, CRCW060318K2FKEA

50 2 RNTC2, RNTC3 THERMISTOR NTC 10k 5% 0603 VISHAY, NTCS0603E3103JMT

51 4 ROFB1, RBFB1, R45, R59 RES., CHIP., 1M, 0.1W, 1% 0603 VISHAY, CRCW06031M00FKEA

52 2 ROFB2, RBFB2 RES., CHIP., 84.5k, 0.1W, 1% 0603 VISHAY, CRCW060384K5FKEA

53 1 RVM1 RES., CHIP., 36.5k, 0.1W, 1% 0603 VISHAY, CRCW060336K5FKEA

54 1 U1 I.C., VOLT. REG. Linear Tech., LTC3789EGN#PBF

55 1 U2 I.C. LTC4000EGN, 28 PIN SSOP Linear Tech., LTC4000EGN#PBF

56 2 U3, U4 NANOPWR COMPARATOR, MSOP8 Linear Tech., LTC1540CMS8#PBF

DC1721B-A Additional Demo Board Circuit Components

57 0 C3, C23, C26, C27 OPT 1210

58 1 C33 CAP., X5R, 4.7μF, 10V, 20% 0603 AVX, 0603ZD475MAT2A

59 1 CBAT CAP., X5R, 2.2μF, 25V, 20% 0805 AVX, 08053D225MAT2A

60 0 CF1, CC1, R6, C7, C8, C11, R12, R22, R27, R30,

R38-R43, R53, R61, R62, CNTC, CF, CCX

OPT 0603 OPT

61 2 CIIMON, CIBMON CAP., C0G, 1000pF, 25V, 5% 0603 AVX, 06033A102JAT2A

62 0 CIN3, CIN4 OPT

63 0 D11 OPT SOD323 OPT

64 1 LED2 LED, DUAL RED/GREEN LiteOn, LTST-C155KGJRKT

65 0 Q10 OPT SOT223 OPT

66 4 R25, R51, R52, R54 RES., 0Ω 1/16W 1A 0603 VISHAY, CRCW06030000Z0EA

67 1 R46 RES., CHIP., 2.2k, 0.1W, 5% 0603 VISHAY, CRCW06032K20JNEA

68 1 R47 RES., CHIP., 4.7k, 0.1W, 5% 0603 VISHAY, CRCW06034K70JNEA

69 0 RIFB1 OPT 0603 OPT

DC1721B-A Hardware: For Demo Board Only

70 6 E1, E2, E15, E17, E18, E20 TESTPOINT, TURRET, 0.061" PbF MILL-MAX, 2308-2-00-80-00-00-07-0

71 12 E3-E14 TESTPOINT, TURRET, 0.094" PbF MILL-MAX, 2501-2-00-80-00-00-07-0

72 5 J1, J2, J3, J4, J5 CONNECTOR, BANANA JACK KEYSTONE, 575-4

73 2 JP1, JP2 HEADER, 3 PIN 0.079 SINGLE ROW SAMTEC, TMM-103-02-L-S

74 4 MH1-MH4 STAND-OFF, NYLON 0.5" KEYSTONE, 8833 (SNAP ON)

75 2 XJP1, XJP2 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

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dc1721bf

DEMO MANUAL

DC1721B-A/DC1721B-B

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC1721B-B Required Circuit Components

1 4 C1, C2, C16, C17 CAP., X5R, 22μF, 25V, 10% 1210 AVX, 12103D226KAT2A

2 2 C4, C22 CAP., X7R, 0.22μF, 16V, 10% 0603 AVX, 0603YC224KAT2A

3 4 C5, C6, C9, C25 CAP., X7R, 3.3μF, 50V, 10% 1210 AVX, 12105C335KAT2A

4 1 C10 CAP., X5R, 2.2μF, 6.3V, 20% 0603 AVX, 06036D225MAT2A

5 1 C12 CAP., NPO, 390pF, 100V, 5% 1206 AVX, 12061A391JAT2A

6 1 C13 CAP., NPO, 1800pF, 100V, 5% 1206 AVX, 12061A182JAT2A

7 2 C15, CIN CAP., X7R, 1μF, 50V, 10% 1210 AVX, 12105C105KAT2A

8 1 C18 CAP., X7R, 10μF, 10V, 10% 1206 AVX, 1206ZC106KAT2A

9 1 C19 CAP., C0G, 1000pF, 25V, 5% 0603 AVX, 06033A102JAT2A

10 2 C24, CBIAS CAP., X7R, 1μF, 16V, 10% 0603 AVX, 0603YC105KAT2A

11 2 C34, C35 CAP., X7R, 0.01μF, 25V, 5% 0603 AVX, 06033C103JAT2A

12 3 CC2, C14, CTMR CAP., X7R, 0.1μF, 50V, 10% 0603 AVX, 06035C104KAT2A

13 2 CIN1, CIN2 CAP., ALUM., HVH, 56μF, 50V SUN Electronics, 50HVH56M

14 1 CL CAP., X5R, 2.2μF, 25V, 20% 0805 AVX, 08053D225MAT2A

15 2 COUT1, COUT2 CAP., OS-CON, 150μF, 20V, 20% SANYO, 20SVP150M

16 1 CSS CAP., X7R, 0.022μF, 50V, 10%, 0603 AVX, 06035C223KAT2A

17 1 D2 DIODE, SWITCH 75V 350MW SOT23-3 DIODES/ZETEX, BAS16-7-F

18 2 D4, D7 DIODE, SCHOTTKY 1A 60V POWERDI123 DIODES/ZETEX, DFLS160-7

19 2 D5, D6 DIODE, SCHOTTKY 40V 2A SMA DIODES/ZETEX, B240A-13-F

20 1 D9 DIODE, ZENER 3V 500MW SOD-323 DIODES/ZETEX, BZT52C3V0S-7-F

21 1 D10 DIODE, ZENER 5.6V 500MW SOD-123 DIODES/ZETEX, BZT52C5V6-7-F