DC1568A - Demo Manual

DEMO MANUAL DC1568A
LT3652EDD
2A Monolithic Multichemistry
Battery Charger for Solar Power
Description
Demonstration circuit 1568A is a 2A monolithic multichemistry battery charger for solar power applications
featuring the LT3652EDD. The LT3652 is a complete
mid-power Li-Ion battery charger that can operate over
a wide input voltage range. The charger employs a 3.3V
float voltage feedback reference that allows the battery
float voltage to be adjusted up to 14.4V. The LT3652 has
an input voltage regulation loop which reduces charge
current if the input falls below a programmed level, set
with a resistor divider. The circuit provides CC/CV charging
with a 2A maximum charge current that is programmed by
Performance Summary
PARAMETER
a sense resistor. A precondition feature trickle charges a
low voltage battery, and bad battery detection provides a
signal if the battery does not respond to preconditioning.
The LT3652EDD is available in a 12-lead (3mm × 3mm)
DFN surface mount package with an exposed pad.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
(TA = 25°C)
CONDITIONS
VALUE
Input Voltage Range
11.5V to 32V
VOUT
8.14V to 8.26V
Output Float Voltage
Constant Voltage Mode
8.2V
Output Current Limit ILIM
VIN_REG Greater Than 2.7V
2A
Operating Principles
LT3652 is a complete monolithic mid-power Li-Ion battery
charger, addressing high input voltage applications with
solutions that require a minimum of external components.
The IC uses a 1MHz constant frequency, average-current
mode step-down architecture.
The LT3652 maximizes efficiency during charging cycles
by using a bootstrapped supply to drive the internal power
switch. When the output voltage is programmed to 8.2V,
the circuit provides full charge over a wide 11.5V to 32V
input range. A precision threshold shutdown pin allows
the incorporation of UVLO functionality using a simple
resistor divider. The IC can also be put into a low current
shutdown mode, in which the input supply bias is reduced
to only 15µA.
The LT3652 charge current control allows maximum
power point tracking (MPPT) use with solar panels. The
overall maximum charge current is set using an external inductor current sense resistor. An input voltage
regulation pin allows the charger to reduce the battery
charge current if necessary so the solar panel produces
the most power.
The LT3652 automatically enters a battery precondition
mode if the sensed battery voltage is very low. In this
mode, the charging current is reduced to 15% of the
programmed maximum, as set by the inductor sense
resistor, RSENSE. Once the battery voltage increases to
the precondition threshold, the IC automatically increases
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DEMO MANUAL DC1568A
Operating Principles
maximum charging current to the full programmed value.
DC1568A programs the output voltage to be 8.2V, and the
5.7V precondition threshold is internally set as a fraction
of the programmed output voltage.
The LT3652 can use a charge current based C/10 termination scheme, which ends a charge cycle when the
battery charge current falls to one-tenth the programmed
maximum charge current. The LT3652 also contains an
internal charge cycle control timer, for timer-based termination. When using the internal timer, the IC combines C/10
detection with a programmable time constraint, during
which the charging cycle can continue beyond the C/10
level to “top off” a battery. The charge cycle terminates
when a specific time elapses, typically three hours. When
the timer based scheme is used, the IC also supports bad
battery detection, which triggers a system fault if a battery
stays in precondition mode for more than one-eighth of
the total charge cycle time.
Once charging is terminated and the LT3652 is not actively
charging, the IC automatically enters a low current standby
mode where supply bias currents are reduced to < 100µA.
If the battery voltage drops 2.5% from the full charge float
voltage, the LT3652 engages an automatic charge cycle
restart. The IC also automatically restarts a new charge
cycle after a bad battery fault once the failed battery is
removed and replaced with another battery.
The LT3652 includes provisions for a battery temperature monitoring circuit. This feature monitors battery
temperature during the charging cycle using a thermistor,
and suspends charging and signals a fault condition if the
battery temperature moves outside a safe charging range
of 0°C to 50°C.
The LT3652 contains two digital open collector outputs,
which provide charger status and signal fault conditions.
These binary coded pins signal battery charging, standby
or shutdown modes, battery temperature faults and bad
battery faults.
Quick Start Procedure
DC1568A is easy to set up to evaluate the performance
of the LT3652EDD.
Using short twisted-pair leads for any power connections,
with all loads and power supplies off, refer to Figure 1 for
the proper measurement and equipment setup.
Follow the procedure below:
1.Jumper and power supply settings:
JP1 = 1
JP4 = 1
JP2 = 1
PS1 = OFF
JP3 = C/10
PS2 = OFF
2.Turn on PS2 and slowly increase the voltage until VBAT
is 5.4V while monitoring the current into the BAT pin.
If the current is less than 5mA, turn on PS1. Increase
PS1 until VIN is 12V while monitoring the input current.
3. Verify that the battery charging current, IBAT, is between
250mA and 350mA. The CHRG LED should be on and
the FAULT LED should be off.
4.Increase PS2 until VBAT is 7.2V. Verify that the input
current, IIN, is between 1.3A and 1.7A, the battery current, IBAT, is between 1.775A and 2.225A and that the
CHRG LED is on.
5.Increase PS2 until VBAT is 8.5V. Verify that the battery
charging current, IBAT, is less than 5mA and that the
CHRG LED is off.
6.Decrease PS2 until VBAT is 7.8V. Verify that the battery
current, IBAT, is between 1.775A and 2.225A and that
the CHRG LED is on.
7.Set JP1 to 0. Verify that the charging current, IBAT, is
less than 5mA and that the FAULT LED and the CHRG
LED are off.
8.Set JP1 to 1. Connect a jumper from the NTC pin to
ground. Verify that the charging current, IBAT, is less
than 5mA and that the FAULT LED and the CHRG LED
are on.
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DEMO MANUAL DC1568A
quick start procedure
9. Remove the jumper from NTC to ground. Verify that
the charging current, IBAT, is between 1.775A and
2.225A, that the FAULT LED is off and the CHRG LED
is on.
13.Set JP4 to 0. Setting JP4 to 0 turns off the charge
current when VIN is less than 17.7V. Verify that the
battery charging current is less than 5mA and that
the CHRG LED is off.
10. Turn on LOAD1 and set to 1A. Verify that the voltage,
VSYSTEM, on the SYSTEM LOAD turret is approximately equal to VIN.
14. Increase PS1 until VIN is 17.7V. Verify that the charging
current is between 1.775A and 2.225A and that the
CHRG LED is on. Set JP4 to 1.
11.Set JP2 to 0. Verify that the battery charging current
is less than 5mA and that the CHRG LED is off.
15.Turn off PS1, PS2 and LOAD1.
12. Increase PS1 until VIN is 14V. Verify that the charging
current is between 1.775A and 2.225A and that the
CHRG LED is on. Set JP2 to 1.
NOTE: All connections from equipment should be Kelvinconnected directly to the board pins which they are connected to on the diagram in Figure 1, and any input or
output leads should be twisted pair.
Figure 1. Proper Measurement Equipment Setup for the DC1568A
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DEMO MANUAL DC1568A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
2
C2, C3
CAP., X7R, 4.7µF, 50V, 10%, 1210
MURATA, GRM32ER71H475KA88L
2
1
C4
CAP., X7R, 1µF, 50V, 10%, 0805
MURATA, GRM21BR71H105KA12B
3
1
C6
CAP., X5R, 100µF, 10V, 20%, 1210
TAIYO YUDEN, LMK325BJ107MM-T
4
1
C7
CAP., X7R, 10µF, 10V, 10%, 0805
MURATA, GRM21BR71A106KE51L
5
1
C10
CAP., X5R, 0.68µF, 10V, 10%, 0402
MURATA, GRM155R61A684KE15D
6
2
D1, D2
SMD, SCHOTTKY BARRIER RECTIFIER
CENTRAL SEMI, CMSH3-40MA
7
1
D5
SMD, SCHOTTKY DIODE, SOT-23F
CENTRAL SEMI, CMPSH1-4
8
1
L1
POWER INDUCTOR, 10µH, 20%, 3.5A
VISHAY, IHLP2525CZER100M11
9
1
R1
RES., CHIP, 1M, 1/16W, 1%, 0402
VISHAY, CRCW04021M00FKED
10
1
R4
RES., CHIP, 536k, 1/16W, 1%, 0402
VISHAY, CRCW0402536KFKED
11
2
R5, R6
RES., CHIP, 100k, 1/16W, 1%, 0402
VISHAY, CRCW0402100KFKED
12
1
R7
RES., CHIP, 0.05Ω, 1/2W, 1%, 1206
SUSUMU, RL1632R-R050-F
13
1
R10
RES., CHIP, 619k, 1/16W, 0.1%, 0603
NIC, NTR06B6193DTRF
14
1
R11
RES., CHIP, 417k, 1/16W, 0.1%, 0603
NIC, NTR06B4173DTRF
15
1
R12
RES., CHIP, 0.1Ω, 1/2W, 1%, 1206
SUSUMU, RL1632R-R100-F
16
1
U1
MULTICHEMISTRY 2A BATTERY CHARGER FOR
SOLAR POWER
LINEAR TECHNOLOGY, LT3652EDD
Optional Demo Board Circuit Components
1
1
C1
CAP., SMT, 390µF, 50V, 20%
SUNCON, 50CE390BS
2
0
C5
CAP, OPT, 0402
CUSTOMER SELECTABLE
3
2
C8, C9
CAP, CHIP, X7R, 0.022µF, ±10%, 16V, 0402
AVX, 0402YC223KAT2A
4
1
D3
LED, RED
PANASONIC, LNJ208R8ARA
5
1
D4
LED, GREEN
LITE-ON, LTST-C190KGKT
6
0
D6
SMD, SCHOTTKY BARRIER RECTIFIER
CENTRAL SEMI, CMSH3-40MA
7
2
R2, R3
RES., CHIP, 5.1k,1/4W, 1%, 1206
VISHAY, CRCW12065K10FKEA
8
1
R8
RES., CHIP, 20 ,1/16W, 5%, 0402
VISHAY, CRCW040220R0JNED
9
1
R9
RES., CHIP, 0 ,1/16W, 5%, 0402
VISHAY, CRCW04020000Z0ED
Hardware, for Demo Board Only
1
7
E1-E7
TESTPOINT, TURRET, 0.095"
MILL-MAX, 2501-2-00-80-00-00-07-0
2
0
J1
HEADER, 3 PINS
HIROSE ELECTRIC, DF3A-3P-2DSA
3
4
JP1-JP4
2MM SINGLE ROW HEADER, 3 PIN
SAMTEC, TMM-103-02-L-S
4
4
JP1-JP4
SHUNT
SAMTEC, 2SN-BK-G
5
4
STAND-OFF, NYLON, 0.625" TALL (SNAP ON)
KEYSTONE, 8834 (SNAP ON)
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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.
A
B
C
D
1
1
0
1
JP2
5
UVLO
1
RUN
C1
390uF
50V
20%
CMSH3-40MA
JP1
GND
E2
11.5V - 32V
D1
1
+
0
1
X
0
SHDN
2
2
1
3
JP1
2
R1
1.0Meg
0
1
R2
5.1K
1206
FAULT
JP2
2
TIMER
R6
100K
R3
5.1K
1206
C/10
D3
RED
CHRG
C10
0.68uF
JP3
2
D4
GRN
4
0
1
4
1
3
E1
1
3
6
3
5
4
2
TIMER
SHDN
FAULT
13
GND
SW
VIN
VIN_REG
CHRG
12
1
Unless noted:
Resistors: Ohms
0402
1%
1/16W
Capacitors:
0402
10%
10V
R5
100K
JP4
2
R4
536K
R9
0
D5
CMPSH1-4
OPT
C5
2
C4
1uF
50V
0805
20
5%
R8
TP1
CUSTOMER NOTICE
8
7
9
10
C2
4.7uF
50V
1210
0603
0.1%
R11
417K
R10
619K
0603
0.1%
C3
4.7uF
50V
1210
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1
L1 10uH
CMSH3-40MA
J.Drew
Monday, March 18, 2013
DESIGNER
ENGINEER J.Drew
APPROVED
CHECKED
DRAWN
APPROVALS
CONTRACT NO.
TP2
2
IHLP-2525CZ-11
D2
R7
0.05
1206
1/4W
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
NTC
VFB
BAT
SENSE
BOOST
11
U1
LT3652EDD
3
1
2
VIN
1
3
3
1
2
1/19/09
4/16/09
C6
100uF
10V
1210
20%
C7
10uF
10V
0805
10%
BAT
GND
NTC
E6
OPT
J1
GND
E7
NTC
DF3-3P-2DSA
1
2
3
BAT
GND
8.2V
2A
E5
E4
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
C9
0.022uF
16V
TECHNOLOGY
C8
0.022uF
16V
OPT
E3
SYSTEM LOAD
CMSH3-40MA
D6
1
SCALE:
FILENAME:
SIZE CAGE CODE
DWG NO
1
SHEET
1
DC1568A
OF
LT3652EDD
Multi-Chemistry 2A Battery Charger for Solar Power
TITLE
R12
0.1
1206
1/2W
DATE
2
1
2
5
A
1
REV
A
B
C
D
DEMO MANUAL DC1568A
Schematic Diagram
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DEMO MANUAL DC1568A
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 application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
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6
Linear Technology Corporation
LT 0313 REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2011
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