LMC555CMX/NOPBCT-ND | DigiCamel IC Datasheet

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sharing’, a reference design board (order code: 178003) is introduced here. Figure 1. MagI³C Current Sharing Reference Design  Input Voltage Range 7V – 50V  Symmetrical current-sharing ± 3% typ.

Figure 3. Current-Sharing Reference Design with two MagI³C Power Modules in Parallel

Figure 6. Features – terminals, test points, adjustment

sharing. This type of parallel connection has the advantage of scalability and is - compared to the other types - inexpensive. To realize this parallel circuitry several steps are necessary, which are explained in detail in the following chapter. than a single module with the same output current. module (36Vmax), which results in a higher usability. interleaved and non-interleaved, which will be explained now. Figure 7. Overview of the Interleaved- and Non-Interleaved-Mode

5.1 Non-Interleaved Mode

The non-interleaved mode means that both PWM signals, which drive the modules, are in phase. This mode can be used if an application has wide limits regarding electromagnetic emission and/or output voltage ripple. But if an application has strict limits the more complex mode must be used, which will be explained in the following.

5.2 Interleaved Mode

If the PWM signals are 180° out of phase , as showing in figure 8 the power modules work in interleaved mode. Running the converter in interleaved manner brings several benefits. From an electromagnetic interference reduction standpoint, the input voltage ripple is reduced because of the phase shift. Therefore, the requirements for an input filter are more relaxed. The 180° phase shifted output voltage ripple results in a smaller superimposed output voltage ripple on the shared output. This smaller ripple also results in smaller value of the required output capacitor.

6.1 Parallel circuitry

capacitor to VIN pin) also apply to each individual power module as recommended in their datasheet.

31 RT/CLK

Figure 9. Circuit Diagram of the Current-Sharing Reference Design

6.2 Clock Generator

For paralleling two Power Modules (171021501) a clock generator with a rectangular signal is essential. Both RT/CLK-Pins have to be synchronized to this rectangular wave. Therefore the power modules can be - as already mentioned - driven in phase (non -interleaved mode) and 180° out -of-phase (interleaved -mode), which has different advantages considering technical issues. The implemented clock generator for interleaving-mode is shown as follows: The clock is generated by the timer LMC555CM. It is configured as a 50% duty cycle oscillator. Due to its limited maximum supply voltage of 15V a linear regulator LM2936HV is used to support supply voltages up to 60V same as the MagI³C module. The phase shift of 180° is realized by the Schmitt-trigger-inverter SN74LVC1614. The particular signal with a 180° phase shift is routed to each Pin RT/CLK of the power module. To reduce disturbances and have short traces, the discrete clock generator is included in the reference design. Therefore short traces and symmetrical distance to the MagI³C power modules are assured, see VIN VCC RESET CVOLT GND OUT DIS TRIGGER THR CLKLMC555CM GND VIN VOUT LM2936HV-5.0 Cbyp 100nF RCLK 10µF 10µF 20mΩ CIN COUT CVCC 100nF 8 3 SN74LVC1G14 RT/CLK (31) RT/CLK (31) CCLK Setting the frequency Figure 10: Clock Generator Circuit

DNS003 Current-sharing with MagI³C Power Modules DNS003 V1.0 Markus Roppel - February 2019 Page 12/21 Copyright © Würth Elektronik eiSos GmbH & Co. KG 7. Filter Suggestions for Conducted EMI The input filter shown in the schematic below is recommended to achieve conducted compliance according to EN55032 Class B. For radiated EMI the input filter is not necessary. It is useful to comply with the setup recommended in the standard. If two or more modules are connected to a single rail, the individual module’s input has to be decoupled by an inductor in each input line in order to avoid mutual oscillations caused by the coupling and additional undesired antenna effect. To decouple these input lines and comply with the standard, two input LC filter designs are recommended:

7.1 LC Input Filter with a Common Filter Capacitor

First of all a LC input filter with one common filter capacitor Cf is recommended: Figure 13: Simplified Schematic with a LC Input Filter (Common Cf) Bill of Material of the Input LC Filter Designator Description Order Code Manufacturer C99 (Cf) Filter ceramic chip capacitor 4.7μF/50V X7R, 1210 885012209048 Würth Elektronik L1, L2 Filter inductor, 4.7µH, PD2 family 744773047 Würth Elektronik C13 C14 Input LC Filter VIN GND MagI³C Power Module 1 VIN GND MagI³C Power Module 2 C10 VIN Cf GND Cin

DNS003 Current-sharing with MagI³C Power Modules DNS003 V1.0 Markus Roppel - February 2019 Page 13/21 Copyright © Würth Elektronik eiSos GmbH & Co. KG Interleaved Mode: Conducted EMI Results measured on the reference design board: Figure 14: Conducted EMI The used filter complies with the standard EN55022 Class B. The reference design board allows also a splitting of the filter capacitor Cf, which is now shown below. 0.15 1 10 Frequency [MHz] Conducted Emissions [dBµV] Conducted Emissions 178003 VIN = 24V, VOUT = 5V, ILOAD = 5A with input filter 4.7µF (885012209048) common and 4.7µH (744773047) Average Quasi peak EN55022 Class B Quasi Peak limit EN55022 Class B Average limit -10 300.5 Test conditions Value Unit Input voltage VIN 24 V Output voltage VOUT 5 V Switching frequency fSW 500 kHz Output current IOUT 5 A Filter capacitor Cf 4.7 µF Filter inductor L1, L2 4.7 µH Ambient temperature TAMB 22 °C

7.2 LC Input Filter with a Filter Capacitor in Each Input Line

A LC input filter with a separated filter capacitor C17, C18 in each input trace: Figure 15: Simplified Schematic with a LC Input Filter (Separated Cf) Bill of Material of the input LC Filter Designator Description Order Code Manufacturer C17, C18 Filter ceramic chip capacitor 2.2μF/100V X7R, 1210 - Various L1, L2 Filter inductor, 4.7µH, PD2 family 744773047 Würth Elektronik C13 C14 Input LC Filter VIN GND MagI³C Power Module VIN GND MagI³C Power Module C10 VIN GND C17 C18

DNS003 Current-sharing with MagI³C Power Modules DNS003 V1.0 Markus Roppel - February 2019 Page 15/21 Copyright © Würth Elektronik eiSos GmbH & Co. KG Interleaved Mode: Test conditions Value Unit Input voltage VIN 24 V Output voltage VOUT 5 V Switching frequency fSW 500 kHz Output current IOUT 5 A Filter capacitor C17, C18 2.2 µF Filter inductor L1, L2 4.7 µH Ambient temperature TAMB 22 °C Conducted EMI Results measured on the reference design board: Figure 16: Conducted EMI Dividing the filter capacitor Cf leads to a minimal (approximately 6-7dBµV) improvement of the EMC. With these results the following final recommendation can be given: With two separated filter capacitors, there is more safety (higher filtering effect) with the layout, if the input lines are not exactly symmetrical because of e.g. space reasons. 0.15 1 10 Frequency [MHz] Conducted Emissions [dBµV] Conducted Emissions 178003 VIN = 24V, VOUT = 5V, ILOAD = 5A with input filter 2.2µF separated and 4.7µH (744773047) Average Quasi peak EN55022 Class B Quasi Peak limit EN55022 Class B Average limit -10 300.5

DNS003 Current-sharing with MagI³C Power Modules DNS003 V1.0 Markus Roppel - February 2019 Page 17/21 Copyright © Würth Elektronik eiSos GmbH & Co. KG Figure 18: Top View CONCLUSION  Symmetrical routing of power paths  Clock generator placed in center  Shunt resistors for current measurements  Input filter option in each path The next two chapters show the “SCHEMATIC” and the “BILL OF MATERIAL” of the reference design.

DNS003 Current-sharing with MagI³C Power Modules DNS003 V1.0 Markus Roppel - February 2019 Page 18/21 Copyright © Würth Elektronik eiSos GmbH & Co. KG 9. Schematic Figure 19: Schematic of the Reference Design

DNS003 Current-sharing with MagI³C Power Modules DNS003 V1.0 Markus Roppel - February 2019 Page 20/21 Copyright © Würth Elektronik eiSos GmbH & Co. KG 11. Bill of Material Designator Description Quantity Order Code Manufacturer IC3, IC4 MagI³C Power Module 2 171021501 Würth Elektronik R2, R3 SMD bridge 0Ω resistance 2 - Various R8, R9 4.7kΩ for VOUT = 2,5V 2 - Various 3.2kΩ for VOUT = 3,3V 2 - Various 1.9kΩ for VOUT = 5V 2 - Various 976Ω for VOUT = 9V 2 - Various 714Ω for VOUT = 12V 2 - Various 563Ω for VOUT = 15V 2 - Various C9, C10, C13, C14 Ceramic chip capacitor 2.2µF/100V, X7R, 1210 4 - Various C7, C8, C11, C12 Ceramic chip capacitor 22µF/25V, X7R, 1210 4 - Various C15 (Cin), C16 (Cout) Aluminium electrolytic capacitor 27µF/100V 2 860040874001 Würth Elektronik R10 (Rin1), R11 (Rin2) Shunt resistor 1mΩ 2 - Various R12 (Rout1), R13 (Rout2) Shunt resistor 1mΩ 2 - Various C25 Ceramic chip capacitor 100pF/10V, X7R, 0805 1 885012207004 Würth Elektronik Clock generator components: Designator Description Quantity Order Code Manufacturer IC1 Timer 1 LMC555CMX/NOPBCT- ND Texas Instruments IC2 Schmitt-Trigger Inverter 1 SN74LVC1G14DBVR Texas Instruments IC5 Linear Voltage Regulator 1 LM2936HVMAX- 5.0/NOPBCT-ND Texas Instruments C1 Ceramic chip capacitor 1nF/50V, X7R, 0805 1 885012207086 Würth Elektronik 823Ω for f = 500kHz 1 - Various 632Ω for f = 600kHz 1 - Various 503Ω for f = 700kHz 1 - Various 410Ω for f = 800kHz 1 - Various 342Ω for f = 900kHz 1 - Various 289Ω for f = 1000kHz 1 - Various C2, C20 Ceramic chip capacitor 100nF/50V, X7R, 0805 2 885012207098 Würth Elektronik C3, C4 Ceramic chip capacitor 470pF/10V, C0G, 0805 2 885012007007 Würth Elektronik R4, R5 1kΩ 2 - Various C5 Ceramic chip capacitor 2.2µF/100V, X7R, 1210 1 - Various C6 Ceramic chip capacitor 10µF/10V, X7R, 0805 1 885012207026 Würth Elektronik R6, R7 Shunt resistor 20mΩ 2 - Various

DNS003 Current-sharing with MagI³C Power Modules DNS003 V1.0 Markus Roppel - February 2019 Page 21/21 Copyright © Würth Elektronik eiSos GmbH & Co. KG Important Notes The 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 informatio n 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. 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 I NTELLECTUAL 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 SERV ICES OR A W ARRANTY 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 injury or death. Moreover, WE products are neither designe d 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, custom ers 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 AGAINST 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 we-online.com

Product Information

LMC555CMX/NOPBCT-ND specifications and overview.

Summary

MagI3C Power Modules DNS003 Current-sharing with MagI쨀C Power Modules V1.0

Description

MagI3C Power Modules DNS003 Current-sharing with MagI쨀C Power Modules V1.0

Source title LMC555CMX/NOPBCT-ND Datasheet(PDF) - Analog Technologies, Inc.

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