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 dc2302afa DEMO MANUAL DC2302A Demo Board Procedure (a) (b) (c) Figure 4. Proper Insertion of Battery in Demo Kit dc2302afa 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 dc2302afa 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 dc2302afa 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 LT 0316 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 2016