178004

Reference Design Note MagI3C Power Modules DNS004 MagI3C Current Source 1. Introduction The MagI3C Current Source 178004 demonstrates how a MagI3C Power Module can be used for high current LED applications. An adjustable output current limit can be set up to 3A. An output voltage limit can also be set to predefined values which corresponds to end of charge voltages of some common batteries. Batteries can be charged with a dc current or with a defined charging current waveform, if a digital to analog converter or a PWM output of a microcontroller is used instead of the jumpers for current adjustment. An end of charge voltage can also be set as well as Super Cap charging. High power LEDs can be supplied up to 3A. During the development of a customer’s prototype, the MagI3C Current Source can be implemented into the prototypes housing until the LED driver or batterie/supercap charger is defined for the ready to market product. Figure 1. MagI3C Current Source – Order Code 178004 DNS004 V1.1 Roland Kratz - February 2019 Copyright © Würth Elektronik eiSos GmbH & Co. KG Page 1/6 Reference Design Note MagI3C Power Modules DNS004 MagI3C Current Source 2. Specifications Electrical Specifications § § § § § § Features Input Voltage Range Input Voltage Transients Output Voltage Range Output Current Limit Maximum Output Power Switching Frequency 4V – 18V Max. 20V 0V – 17V 0A – 3A 51W 850kHz § Adjustable Vout Limit § Adjustable Iout limit § External Iout control 1.45 / 3.6 / 4.1 / 4.1 / 6.8 / 14.4V 0.35 / 0.7 / 1.05 / 1.5 / 2 / 3A 0-3.3Vdc or PWM 3. Functional Diagram Power Module L1 T1 CIN T2 Controller IC COUT RLOAD Feedback Rs Error Amplifier Adj. Current Set Value R1 R2 Figure 2. Functional Diagram The output voltage of the MagI3C Power Module is defined by the resistor divider R1 and R2. R2 can be changed by the jumper on the reference design. This adjusted output voltage is the maximum possible voltage which is achievable at the output when the output current is lower than the adjusted current limit, or if the output is not connected to a load. The output current is measured by RS and compared with an internal reference by the external error amplifier. This external error amplifier interacts with the feedback of the power module in a way that the adjusted output current is not exceeded. The output current is maintained to the adjusted set value. DNS004 V1.1 Roland Kratz - February 2019 Copyright © Würth Elektronik eiSos GmbH & Co. KG Page 2/6 Reference Design Note MagI3C Power Modules DNS004 MagI3C Current Source 4. Schematic Figure 3. Schematic DNS004 V1.1 Roland Kratz - February 2019 Copyright © Würth Elektronik eiSos GmbH & Co. KG Page 3/6 Reference Design Note MagI3C Power Modules DNS004 MagI3C Current Source 5. Assembly Drawing Figure 4. Assembly Drawing (Zoomable Vector Graphic) DNS004 V1.1 Roland Kratz - February 2019 Copyright © Würth Elektronik eiSos GmbH & Co. KG Page 4/6 Reference Design Note MagI3C Power Modules DNS004 MagI3C Current Source 6. Bill of Material Designator Value Description Quantity C1,C3 C2 330µ/25V Electrolytic Capacitor 2 22µ/25V/X5R/20% Ceramic Capacitor 1 C4 Not placed C5 1n0/50V/X7R/10% Ceramic Capacitor 1 C6,C8 100n/25V/X7R/10% Ceramic Capacitor 2 C7 100n/10V/X7R/10% Ceramic Capacitor C9,C10 1µ/25V/X5R/20% CF 10µ/25V/X7R/10% R1 R2 Package Manufacturer Order Code Würth Elektronik 860010474012 Würth Elektronik 885012109014 0402 Würth Elektronik 885012205061 0402 Würth Elektronik 885012205018 1 0805 Würth Elektronik 885012207016 Ceramic Capacitor 2 0603 Würth Elektronik 885012106022 Ceramic Capacitor 1 1210 Würth Elektronik 885012209028 0Ω Resistor 1 0805 Rohm Semiconductor TRR10EZPJ000 1.21kΩ /1%/TK100 Resistor 1 0805 Rohm Semiconductor MCR10ERTF1211 R3 0Ω Resistor 1 0402 Rohm Semiconductor PMR01ZZPJ000 R4 1.00kΩ /1%/TK100 Resistor 1 0402 Rohm Semiconductor ESR01MZPF1001 R5,R15 475Ω/1%/TK100 Resistor 2 0805 Rohm Semiconductor MCR10ERTF4750 R6, RFBT 10.0kΩ/1%/TK100 Resistor 1 0402 Rohm Semiconductor TRR01MZPF1002 R7 10.0kΩ/1%/TK100 Resistor 1 0805 Rohm Semiconductor KTR10EZPF1002 R8 not placed Resistor 1 0805 R9 12.4kΩ/1%/TK100 Resistor 1 0805 Rohm Semiconductor KTR10EZPF1242 R10,R12 2.37kΩ/1%/TK100 Resistor 2 0805 Rohm Semiconductor KTR10EZPF2371 R11 2.43kΩ/1%/TK100 Resistor 1 0805 Rohm Semiconductor KTR10EZPF2431 R13 1.33kΩ/1%/TK100 Resistor 1 0805 Rohm Semiconductor KTR10EZPF1331 R14 590Ω/1%/TK100 Resistor 1 0805 Rohm Semiconductor KTR10EZPF5900 R16 316Ω/1%/TK100 Resistor 1 0805 Rohm Semiconductor KTR10EZPF3160 R17 232Ω/1%/TK100 Resistor 1 0805 Rohm Semiconductor SFR10EZPF2320 R18 162Ω/1%/TK100 Resistor 1 0805 Rohm Semiconductor KTR10EZPF1620 R19 107Ω/1%/TK100 Resistor 1 0805 Rohm Semiconductor KTR10EZPF1070 R20 53.6Ω/1%/TK100 Resistor 1 0805 Rohm Semiconductor KTR10EZPF53R6 R21 not placed 1 0805 R22,R23 47.5kΩ/1%/TK100 Resistor 2 0603 Rohm Semiconductor TRR03EZPF4752 R24 100Ω/1%/TK100 Resistor 1 0402 Rohm Semiconductor TRR01MZPF1000 RENT 100kΩ/1%/TK100 Resistor 1 0402 Rohm Semiconductor TRR01MZPF1003 RENB not placed 1 0402 RSHUNT 50mΩ Shunt Resistor 1 2010 Isabellenhütte VMP-R050-1.0 LF 4.7µ Indcutor WE-PD2 1 7850 Würth Elektronik 744775047 D1 BAS70 Diode 1 0402 Diodes Inc. BAS70LP-7B IC1 171031801 MagI3C Power Module 1 LGA16 Würth Elektronik 171031801 IC2 MAX15006A Linear Regulator 1 6TDFN Maxim MAX15006AATT IC3 LM258 Operational Amplifier 1 DFN8 ST Microelectronics LM258QT CON1,CON2 Terminal Block 2 Würth Elektronik 691502710002 CON3,CON4 Pin Header 2*7 2 Würth Elektronik 61301421121 CON5,CON6 Pin Header 1*2 2 Würth Elektronik 61300211121 TP1-TP6 Test Pin 6 Stelvio Kontek 3110325000500 J1,J2,J3 Jumper 3 Würth Elektronik 609976302001 1210 0402 Figure 5. Bill of Material DNS004 V1.1 Roland Kratz - February 2019 Copyright © Würth Elektronik eiSos GmbH & Co. KG Page 5/6 Reference Design Note MagI3C Power Modules DNS004 MagI3C Current Source 7. Important Notes This Reference Design Note / Application Note is based on our knowledge and experience of typical requirements concerning these areas. It serves as general guidance and should not be construed as a commitment for the suitability for customer applications by Würth Elektronik eiSos GmbH & Co. KG. The information in the Application Note is subject to change without notice. This document and parts thereof must not be reproduced or copied without written permission, and contents thereof must not be imparted to a third party nor be used for any unauthorized purpose. Würth Elektronik eiSos GmbH & Co. KG and its subsidiaries and affiliates (WE) are not liable for application assistance of any kind. Customers may use WE’s assistance and product recommendations for their applications and design. The responsibility for the applicability and use of WE Products in a particular customer design is always solely within the authority of the customer. Due to this fact it is up to the customer to evaluate and investigate, where appropriate, and decide whether the device with the specific product characteristics described in the product specification is valid and suitable for the respective customer application or not. 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Customers acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of WE products in such safety-critical applications, notwithstanding any applications-related information or support that may be provided by WE. CUSTOMERS SHALL INDEMNIFY WE AGAINST ANY DAMAGES ARISING OUT OF THE USE OF WE PRODUCTS IN SUCH SAFETY-CRITICAL APPLICATIONS. USEFUL LINKS CONTACT INFORMATION Application Notes / Reference Design Notes https://www.we-online.com/app-notes Technical Support powermodules@we-online.com REDEXPERT Design Tool https://www.we-online.com/redexpert Würth Elektronik eiSos GmbH & CO. KG Max-Eyth-Str. 1, 74638 Waldenburg Germany Toolbox https://www.we-online.com/toolbox Tel.: +49 7942 945 0 Web: we-online.com MagI3C Product Catalog https://katalog.we-online.com/en/pm DNS004 V1.1 Roland Kratz - February 2019 Copyright © Würth Elektronik eiSos GmbH & Co. KG Page 6/6