DC2302A - Demo Manual

DEMO MANUAL DC2302A
LTC4123EDC
Low Power Wireless Charger
Demonstration Kit
Description
Demonstration Circuit DC2302A is a kit of the DC2300A
demonstration board, featuring the LTC®4123EDC, and the
DC2301A Single Switch Transmitter demonstration board.
The DC2300A can charge a single NiMH battery at up to
25mA, with an air gap of 0.8mm to 4.0mm. The DC2300A
detects Zinc-Air primary cells and will not charge them.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2302A
L, LT, LTC, LTM, Linear Technology, the Linear logo and TimerBlox are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Performance Summary
Specifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
VIN
DC2301A Voltage Input
IVIN ≤ 0.5A
4.5
5.5
V
IBAT
DC2300A Battery Charger Current
VCC = 3V ~ 5V, DC2300A.R1 = 953Ω
24
26
mA
TYP
MAX
UNITS
AIR GAP
ACIN
Tx COIL
VIN
+
–
TRANSMITTER
CIRCUIT
LRX
13µH
BAT
ICHARGE =
25mA MAX
VCC
LED
LTC4123
CRX
33nF
+
CHRG
CIN
4.7µF
1.5V
NiMH
BATTERY
GND PROG
RPROG
953Ω
4123 TA01
Figure 1. Demonstration Kit with Battery
Figure 2. Typical Application Circuit
dc2302afa
1
DEMO MANUAL DC2302A
Demo Board Procedure
Refer to Figure 5 for the 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 touching the probe tip directly across the signal
and GND terminals. See Figure 6 for proper scope probe
technique.
1.Set PS1 to 1.3V and turn on.
2.Plug a Micro-USB cable into DC2301.J1, the other end
of the cable should go to a computer USB port or a 5V
wall charger.
3.Verify that DC2301A.D1 is lit. DC2301A.D1 is between
the boards, near the front face.
4.The LTC4123EDC spends the first 90s after power up
testing for either a reverse battery or a Zinc-Air primary battery. DC2300A.D1 should be blinking slowly.
AM1should read 25mA. VM1 should read between 3V
and 5V.
The LTC4123EDC tests for a Zinc-Air battery by applying
the programmed charge current, and checking to see
if V(BAT) rises above ≈ 1.65V.
If the battery is absent, reversed or Zinc-Air, DC2300A.
D1 will start blinking rapidly.
5. Turn off and disconnect PS1, AM1 and VM1. Install the
P675 NiMH battery in the DC2300A.BH1 battery holder.
See Figure 4 for proper insertion. Warning: improper
insertion may short battery.
(a) DC2300A Top
(b) DC2301A Top
(c) DC2300A Bottom
(d) DC2301A Bottom
Figure 3. DC2300A and DC2301A Demo Boards
2
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DEMO MANUAL DC2302A
Demo Board Procedure
(a)
(b)
(c)
Figure 4. Proper Insertion of Battery in Demo Kit
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3
DEMO MANUAL DC2302A
Demo Board Procedure
POWER ONLY
MICRO-USB TO HOST OR 5V
WALL CHARGER
–
VM1
–
AM1
+
+
+
–
PS1
2V BIPOLAR SUPPLY
0.1A
DC2302A F03
Figure 5. DC2300A Mounted on Top of DC2301A
Figure 6. Measuring Input or Output Ripple
Note: All connections from equipment should be Kelvin connected directly
to the board pins which they are connected on this diagram and any input or
output leads should be twisted pair.
4
dc2302afa
DEMO MANUAL DC2302A
Theory of Operation
The DC2302A kit demonstrates operation of the
LTC4123EDC Low Power Wireless Charger. The kit is
composed of the DC2300A Wireless Power Transfer (WPT)
receiver and the DC2301A WPT transmitter.
DC2300A – Low Power Battery Charger Board
Featuring the LTC4123EDC
The LTC4123EDC integrates a low power CC-CV linear
charger optimized for NiMH cells. The LTC4123EDC also
contains a low leakage diode for rectifying the output of
the WPT resonant tank. The DC2300A WPT resonant tank
is set to 244kHz. Tested receive coils are listed in Table 1.
The CC-CV charger will operate with a VCC as low as 2.2V,
and charge a NiMH battery to 1.61V (TA = –10°C). The
Charge Voltage is temperature dependent, a temperature
coefficient of –2.5mV/°C, and a typical charge voltage of
1.5075, at room (see Figure 7).
The LTC4123EDC has a fault state machine that checks
for battery reversal and presence of a Zinc-Air primary
cell in the first 90s after VCC is applied.
The WPT for the LTC4123EDC is implemented as resonant power transfer, with the LTC4123EDC rectifying
the resonant tank voltage to generate VCC (see Figure 9).
DC2301A – Wireless Power Transmitter Board
Featuring the LTC6990IDCB
The DC2301A is a wireless power transmitter board using
an LTC6990IDCB TimerBlox®, followed by a zero voltage
switching Class C amplifier.
The LTC6990IDCB is programmed to generate a 244kHz
square wave, but the Class C amplifier tank is resonant at
315kHz, resulting in zero voltage switching (see Figure 8).
Tested transmit coils are listed in Table 2.
M1.g
M1.d
The LTC4123EDC has an on-die temperature sensing that
will shut down the charger if the sensed temperature is
too high or low.
X-AXIS (?)
1.600
Figure 8. DC2301A VIN = 5V, Air Gap = 4mm
CHARGE VOLTAGE
CHARGE VOLTAGE MAX
CHARGE VOLTAGE MIN
1.580
1.560
DC2302A F07
1.540
VBAT (V)
1.520
VCC
1.500
1.480
1.460
ACIN
1.440
1.420
1.400
1.380
RPROG = 23.7kΩ
–5
10
25
40
TEMPERATURE (°C)
55
70
DC2302A F06
Figure 7. Charge Voltage vs Temperature (Placeholder)
X-AXIS (?)
DC2302A F08
Figure 9. DC2300A VIN = 5V, Air Gap = 4mm
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5
DEMO MANUAL DC2302A
Theory of Operation
Operating the DC2302A WPT Kit from a USB Port
The DC2302A WPT Demo Kit to can comply with the
requirements for a USB peripheral. One requirement is
the 50µC inrush charge specification, which drives the
maximum input capacitance. Another requirement is that
a USB peripheral must draw less than 100mA, until negotiating for more. The DC2302A WPT kit does not contain
a microcontroller to negotiate for more than 100mA, so,
it must operate at less than 100mA.
DC2301A.C2 can be changed to 4.7µF, which in parallel
with DC2301A.C1 = 4.7µF, will be less than the 10µF.
The DC2302A will then meet the 50µC inrush charge
specification.
All air gaps mentioned below are the coil face to coil face
distances:
0.8mm USB.VCC current = 102mA @ USB.VCC = 4.5 ~ 5.5V
gap:
300mV of 255kHz ripple on USB.VCC
DC2300A.V(BAT) = 1 ~ 1.4V
2.4mm USB.VCC current = 84mA @ USB.VCC = 4.5 ~ 5.5V
gap:
280mV of 255kHz ripple on USB.Vcc
DC2300A.V(BAT) = 1 ~ 1.4V
4.0mm USB.VCC current = 73mA @ USB.VCC = 4.5 ~ 5.5V
240mV of 255kHz ripple on USB.Vcc
gap:
DC2300A.V(BAT) = 1 ~ 1.4V
So, if the gap is kept greater than ≈ 1.5mm and DC2301A.C2
≤ 4.7μF, the DC2302A should meet the compliance requirements for a USB peripheral. The DC2302A will not support
suspend mode operation.
Parts List
Table 1. Tested LRx Coils
Vendor
Part number
URL
Wurth
760308101208
http://www.we-online.com
Inter-Technical
L4120R19
http://www.inter-technical.com/index.php?page=products#
Sunlord
SWA12R10H17C01B
http://www.sunlordinc.com/
Table 2. Tested LTx Coils
Vendor
Part number
URL
Wurth
760308103206
http://www.we-online.com
Inter-Technical
L41200T23
http://www.inter-technical.com/index.php?page=products#
Sunlord
SWA28R15H08C01B
http://www.sunlordinc.com/
6
dc2302afa
DEMO MANUAL DC2302A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC2300A
Required Circuit Components
1
1
C1
CAP, CHIP, X5R, 4.7µF, ±10%, 10V, 0402
SAMSUNG, CL05A475KP5NRNC
2
1
CRx
CAP, CHIP, C0G, 33nF, ±5%, 50V, 1206/0805
TDK, C2012C0G1H333J125AA
4
1
LRx
RECEIVE ANTENNA, 13µH, ±10%, 10mm
WURTH, 760308101208
5
1
R1
RES, CHIP, 953Ω, ±1%, 1/16W, 0402
VISHAY, CRCW0402953RFKED
6
1
U1
LOW POWER WIRELESS CHARGER, 2mm × 2mm DFN6
LINEAR TECH., LTC4123EDC
Additional Demo Board Circuit Components
1
0
C2-OPT
CAP, CHIP, X5R, 1µF, ±10%, 16V, 0402
TDK, C1005X5R1C105K
2
1
D1
LED, RED, SMT, 0603
ROHM, SML-311UTT86
3
1
R2
RES, CHIP, 4.7kΩ, ±5%, 1/16W, 0402
VISHAY, CRCW04024K70JNED
Hardware: For Demo Board Only
1
1
BH1
COIN CELL BATTERY RETAINER, 11.6mm
KEYSTONE, 2996
2
7
E1, E2, E3, E4, E5, E6, E7
TURRET, 0.061"
MILL-MAX, 2308-2-00-80-00-00-07-0
DC2301A
Required Circuit Components
1
1
C2
CAP, CHIP, X5R,100µF, ±20%,6.3V,1206
MURATA, GRM31CR60J107ME39L
2
1
CTx1
CAP, CHIP, C0G, 33nF, ±1%, 25V, 1206/0805
KEMET, C0805C333F3GACTU
3
1
CTx2
CAP, CHIP, C0G, 1nF, ±5%, 50V, 0603
TDK, C1608C0G1H102J080AA
4
1
LTx
TRANSMIT ANTENNA, 7.5µH, ±10%, 28mm × 15mm
WURTH, 760308103206
5
1
M1
MOSFET, N-CH 20V, 6A, SOT23-3
VISHAY, SI2312CDS-T1-GE3
6
1
R1
RES, CHIP, 205kΩ, ±1%, 1/16W, 0402
VISHAY, CRCW0402357KFKED
7
1
U1
TimerBlox: VOLTAGE CONTROLLED SILICON OSCILLATOR,
2mm × 3mm DFN6
LINEAR TECH., LTC6990IDCB
Additional Demo Board Circuit Components
1
1
C1
CAP, CHIP, X5R, 4.7µF, ±20%, 6.3V, 0402
TDK, C1005X5R0J475M
2
1
D1
LED, RED, SMT, 0603
LITEON, LTST-C193KRKT-5A
3
1
J1
USB2.0 MICRO-B RECEPTACLE, RT, REVERSED, 1932788-1 TE, 1932788-1
4
1
R2
RES, CHIP, 2.2kΩ, ±5%, 1/16W, 0402
VISHAY, CRCW04022K20JNED
TURRET, 0.061"
MILL-MAX, 2308-2-00-80-00-00-07-0
Hardware: For Demo Board Only
1
2
E1, E2
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7
A
B
C
E3
E2
2.2 - 5.5V
PROG
E4
LRx
13µH +/-10%
ACIN
GND
VCC
E1
5
R2
4.7k
244kHz
CRx
33nF
50V
5%
1206/0805
R1
953
4
1
3
4
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
3
5
SCALE = NONE
GEORGE B.
NC
APPROVALS
7
6
BAT
3
D1
DATE:
N/A
SIZE
LTC4123EDC
DEMO CIRCUIT 2300A
2
10 - 5 - 15
IC NO.
GND
1
SHEET
1
OF
1
2
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
OPT
E5
1uF
16V
LOW POWER WIRELESS CHARGER
TECHNOLOGY
CHRG
BAT
0.8 - 1.7V
C2
25mA
E6
E7
GEORGE B.
BH1
DATE
10 - 5 - 15
APPROVED
DESCRIPTION
1
PRODUCTION FAB
REVISION HISTORY
2
2
1
REV
2
TITLE: SCHEMATIC
-
ECO
LTC4123EDC
U1
CHRG
GND
VCC
2
GND
PROG
ACIN
C1
4.7µF
10V
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
UNLESS NOTED:
RESISTORS: OHMS, 0402, 1%, 1/16W
CAPACITORS: uF, 0402, 10%, 50V
4
2
8
1
D
5
A
B
C
D
DEMO MANUAL DC2302A
Schematic Diagram
dc2302afa
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
5
GND
E2
7
6
GND
GND
1
5
3
2
4
D1
3
2
4
R1
205k
R2
2.2k
SET
DIV
OE
5
C1
4.7uF
6.3V
7
6
4
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
3
SCALE = NONE
GEORGE B.
NC
315kHz
1
DATE:
N/A
SIZE
LTC4123EDC
DEMO CIRCUIT2301A
2
10 - 1 - 2015
IC NO.
1
SHEET
1
OF
SINGLE SWITCH TRANSMITTER FOR LTC4123EDC
TECHNOLOGY
1
1
2
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
LTx
7.5µH +/-10%
C2
100uF
6.3V
1206
Si2312CDS
M1
CTx1
CTx2
33nF
1nF
25V
0603
1206/0805
2
TITLE: SCHEMATIC
244kHz
APPROVALS
OUT
U1
LTC6990IDCB
GNDGND
V+
1
3
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
UNLESS NOTED:
RESISTORS: OHMS, 0402, 1%, 1/16W
CAPACITORS: uF, 0402, 10%, 50V
GND
D+
D-
ID
VBUS
J1
USB Micro B RECEPTACLE
TE, 1932788-1
E1
VIN
4.5 - 5.5 V
0.5A
4
3
2
D
5
A
B
C
D
DEMO MANUAL DC2302A
Schematic Diagram
dc2302afa
9
DEMO MANUAL DC2302A
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
10 Linear Technology Corporation
dc2302afa
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●
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