178001 WURTH | Alldatasheet
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Output Current Ripple 10mApp typ. Figure 3. Functional Diagram at the power module’s feedback pin maintaining the set output current value.
Figure 4. Bottom Side of the MagI3C LED Driver covered with copper that can be used to heat up the Module’s copper pads for soldering.
4.1 Footprint
Figure 5. Footprint for Soldering the MagI3C LED Driver
DNS002 V2.0 Roland Kratz - August 2019 Page 4/10 Copyright © Würth Elektronik eiSos GmbH & Co. KG 5. Circuit Description In figure 6, C2 is the low impedance input capacitor for the MagI 3C LED Driver. The switching current flows through this capacitor when the power module’s high side FET conducts. It is recommended to choose all input capacitors of the same type (order code) to prevent resonance between capacitors with different impedances – if multiple ceramic capacitors at the input are used, for example, additional capacitors on the motherboard near the MagI 3C LED Driver. C3 is the output capacitor of the MagI 3C LED Driver. It is an MLCC type with very low ESR and assures a low output voltage ripple. The default internal switching frequency of 400kHz is used. To set the LED current, an external dimming (adjusting) voltage is always required for operation. If 0V is applied at the DIM pin, the output current is about 10mA. Increasing the DIM voltage to 5V increases the output current linearly to 1.5A. If the Enable pin is tied to GND, the MagI3C LED Driver is shut down and the output current will be 0A. If no load is applied, the regulation loop increases the output voltage to a level close to the input voltage. The set value of the output current can not be reached as no load is connected. The Power Good Signal (POWERGOOD) is an open drain output and can be used to dectect the no load condition.
5.1 Output Current Regulation
The voltage across the current sense resistor, R3 is proportional to the output current and referenced to the analog ground. This actual value of the output current is passed to the non inverting input (pin3) of the error amplifier IC3-a. The regulation loop maintains the actual value of the output current to t he set value of the output current given by the voltage level at the DIM pin.
5.2 Auxiliary Power
The linear regulator IC2 is used to supply the error amplifier with 3.3V. IC2 is stable with output capacitors with at least 10mΩ ESR, so a 20mΩ resistor, R2 is used to increase the output capacitor’s ESR by 20mΩ.
5.3 Optional Current Setting Using a Microcontroller
The output current can be dynamically set by a PWM signal from a microcontroller applied at the DIM pin. R7 and C10 averages this PWM signal into a DC voltage which acts as the current set value.
5.4 Design Limitations
The maximum operating input voltage of 36V has been chosen to allow the use of 50V ceramic input capacitors and a linear regulator in a very small package. The actual design limitation of 10mA output current at 0V DIM voltage can be overcome and reduced to 0mA, by using a level shift resistor of 1.00MΩ from the 3.3V auxiliary power IC2 pin3 to the error amplifier’s non inverting input IC3-a pin 3. This moves the actual value of the output cur rent out of the input offset’s voltage range of the error amplifier.
Figure 6. Schematic
Figure 7. Assembly Drawing
Figure 8. Bill of Material color mixing, infrared and ultraviolet applications.
9.1 WL-SMDC SMD Mono-color Ceramic LED Waterclear
9.2 WL-SMDC SMD Mono-color Ceramic LED Waterclear for Horticulture
Figure 10. WL-SMDC SMD Mono-color Ceramic LED Waterclear for Horticulture
9.3 WL-SWTC SMD White Top view Ceramic LED
Figure 11. WL-SWTC SMD White Top view Ceramic LED
9.4 WL-SUMW SMD Ultraviolet Ceramic Waterclear
Figure 12. WL-SUMW SMD Ultraviolet Ceramic Waterclear
9.5 WL-SIMW SMD Infrared Ceramic Waterclear
Figure 13. WL-SIMW SMD Infrared Ceramic Waterclear
DNS002 V2.0 Roland Kratz - August 2019 Page 10/10 Copyright © Würth Elektronik eiSos GmbH & Co. KG 10. 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 b y 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 t heir 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. The technical specifications are stated in the current data sheet of the products. Therefore the customers shall use the data sheets and are cautioned to verify that data sheets are current. The current data sheets can be downloaded at www.we - online.com. Customers shall strictly observe any product -specific notes, cautions and warnings. WE reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services. WE DOES NOT WARRANT OR REPRESENT THAT ANY LICENSE, EITHER EXPRESS OR IMPLIED, IS GRANTED UNDER ANY PATENT RIGHT, COPYRIGHT, MASK WORK RIGHT, OR OTHER INTELLECTUAL PROPERTY RIGHT RELATING TO ANY COMBINATION, MACHINE, OR PROCESS IN WHICH WE PRODUCTS OR SERVICES ARE USED. INFORMATION PUBLISHED BY WE REGARDING THIRD -PARTY PRODUCTS OR SERVICES DOES NOT CONSTITUTE A LICENSE FROM WE TO USE SUCH PRODUCTS OR SERVICES OR A WARRANTY OR ENDORSEMENT THEREOF. WE products are not authorized for use in safety -critical applications, or where a failure of the product is reasonably expected to cause severe personal inju ry or death. Moreover, WE products are neither designed nor intended for use in areas such as military, aerospace, aviation, nuclear control, submarine, transportation (automotive control, train control, ship control), transportation signal, disaster prevention, medical, public information network etc. Customers shall inform WE about the intent of such usage before design-in stage. In certain customer applications requiring a very high level of safety and in which the malfunction or failure of an electronic component could endanger human life or health, customers must ensure that they have all necessary expertise in the safety and regulatory ramifications of their applications. 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 AG AINST ANY DAMAGES ARISING OUT OF THE USE OF WE PRODUCTS IN SUCH SAFETY-CRITICAL APPLICATIONS. USEFUL LINKS Application Notes / Reference Design Notes https://www.we-online.com/app-notes REDEXPERT Design Tool https://www.we-online.com/redexpert Toolbox https://www.we-online.com/toolbox MagI3C Product Catalog https://katalog.we-online.com/en/pm CONTACT INFORMATION Technical Support powermodules@we-online.com Würth Elektronik eiSos GmbH & CO. KG Max-Eyth-Str. 1, 74638 Waldenburg Germany Tel.: +49 7942 945 0 Web: we-online.com