F4810/F2410 Input EMI Filter 80V@10A/50V@10A Preliminary Data Sheet The F4810 and F2410 Input Filters minimize the conducted and radiated emissions generated by switchmode DC/DC converters, and allow board designs utilizing di/dt power converters to meet stringent FCC and EN55022 Class B conducted emissions requirements. Using these filters as the primary power-conditioning device && TM Family converters will provide a in front of any of the Q "worry-free" EMI design. Unlike most available off-the-shelf filter modules, the F4810 and F2410, in addition to common mode noise reduction components, are provisioned with a differential LC-filter stage, which virtually guarantees compliance with conducted noise standards across the frequency range from 150 kHz to 30 MHz, including fundamental switching frequency and its harmonics. Test results show headroom of 15-20 dB for conducted noise quasi-peak levels, in relation to Class B requirements. F4810/F2410 filters are designed specifically for distributed F4810 (on left) and F2410 Input Filters Features * Maximum current 10 A with no derating * Maximum operating input voltage 80V (45V for F2410 version) * 100V/50V 100ms transient withstand capability * Differential LC-filter stage * Surface mounted design * Small footprint - less than 1 sq. in. * Low profile: 0.378" [9.6 mm] maximum * Low weight: 0.34 oz [9.5 g] Applications * Operation over -40C to 85C ambient temperature range Differential and Common Mode filtering for DC/DC converters with 48 V and 24 V input: * No airflow required up to 85C * && Family converter compliance with Enables Q EN55022 and FCC Class B requirements conducted emissions * UL 60950 recognition in U.S. & Canada, and DEMKO certification per IEC/EN 60950 (pending) && Family DC/DC conpower solutions in conjunction with Q verters. Low profile and small size (less than 1 sq. in.) in a surface mount package helps the designer save system board real estate, and simplifies the layout. A single filter can be used with multiple converters, and is capable of providing up to 10A to the converter input bus at 85C. When used as specified within this datasheet, these filters do not require airflow and/or derating at high temperatures. * * * Telecommunications Data communications Distributed Power Solutions F4810/F2410 FDS (Preliminary) Ver 2 08-14-03 USA Toll Free 866 WOW-didt Page 1 of 6 F4810/F2410 Input EMI-Filter 10 A Output Preliminary Data Sheet Electrical Specifications Conditions: TA=25C, No Airflow, Vin=48 Vdc, unless otherwise specified. PARAMETER NOTES MIN TYP MAX UNITS 100 Vdc ABSOLUTE MAXIMUM RATINGS Input Voltage (F4810) Continuous (F2810) Continuous 0 0 50 Vdc Operating Ambient Temperature -40 85 C Storage Temperature -55 125 C ELECTRICAL CHARACTERISTICS Operating Input Voltage Range (F4810) (F2410) Maximum Operating Current 0 48 80 Vdc 0 24 45 Vdc 10 Adc 85C ambient, no airflow 0.016 4.5 H For frequencies below 10MHz 6.5 H F4810 57 dB F2410 63 dB F4810 56 dB F2410 57 dB F4810, F2410 24 dB 50 dB 99.7 % DC resistance (total for two legs) Filter differential inductance Filter common mode inductance Differential mode Attenuation at 400 kHz Differential mode attenuation at 30mHz Common mode Attenuation at 400 kHz Common mode Attenuation at 30 mHz 1 1 2 2 Efficiency at Maximum Load F4810, F2410 Vin = 48V @ 10A 99.6 Additional Notes: 1. 50 source and 50 load impedance. See Fig 2 and 3 for differential mode attenuation in 20kHz-100MHz frequency range 2. 50 source and 50 load impedance; external common-mode capacitors 0.1uF (from IN+ and IN- to the common chassis). See Fig. 4 for attenuation in 20kHz-100MHz frequency range. Description The F4810 and F2410 filters contain input and output capacitors, plus differential and common mode inductors. Shown in Fig. 1, the schematic diagrams of both filters are similar, the only difference are changes in C1, C2 capacitor values. The separate differential inductor, L2, allows a 50 differential attenuation of 60 dB across the stated frequency range, a value substantially higher in comparison with other available off-the-shelf filters (typically 25-30 dB). The F4810 can be used in 24V or 48V systems without any limitations; however, in 24V systems the F2410 differential attenuation is better. At low frequencies around 100-200 kHz the difference is 20dB, but at high frequencies the plots are close to identical F4810/F2410 FDS (Preliminary) Ver 2 08-14-03 Absolute maximum voltage and maximum operating voltage in Electrical Specifications Table are for the filter itself; check maximum rating for corresponding DC/DC converters. Filter will not be damaged by reversed input voltage, or by applying voltage to the output pins. R1 49.9 VIN+ VOUT+ L1-1 L2 4.2 H C2 4 F C1 3 F VIN- VOUTL1-2 Fig. 1: Schematic diagram for F4810, F2410. Capacitor values shown are for F4810; for F2410 C1=10 F; C2=13 F. USA Toll Free 866 WOW-didt Page 2 of 6 F4810/F2410 Input EMI-Filter 10 A Output Differential attenuation plots for the F4810 and F2410 filters in the extended frequency range of 20 kHz-100 MHz are shown in Fig. 2 and Fig. 3, respectively, and can be seen to be flat (around 55-60 dB) from 0.35 MHz to 40 MHz. Fig. 2: F4810 - Differential mode attenuation, 0.2-100MHz. Source and load resistances are 50 . Vertical scale: 10dB/div, with zero level marked by arrow. No load, 25C Fig. 4 shows Common mode attenuation with 50 source and load. The attenuation is the same for both filters, and depends on the value of external Y-capacitors, connected between input pins and frame or a reference ground. Preliminary Data Sheet All filter attenuation measurements shown are made with standard 50 source and load resistances. Due to system impedances, differences in actual system attenuation values for the filter/system can be significant after integration into the user application. Therefore, the listed values should be used only for comparison of different filters. Fig. 4: F4810/F2410 - Common Mode attenuation, 0.2100MHz. Source and load resistances are 50 . Two 0.1uF Y-caps to common line. Vertical scale: 10dB/div, with zero dB level marked by arrow. Thermal Considerations Because of low series internal DC resistance, the F4810/F2410 filters generally do not require airflow and/or derating to ambient temperatures up to 85C, if placed and interconnected as described below. Good thermal design is consistent with appropriate placement to gain additional heat exchange through the I/O pins to the system board. For high temperature operation in low airflow environments, use of 1-2 oz copper for the external connection pads and provision for some extra copper at all four I/O pins is encouraged. Thermal Derating data shown were taken on special thermal board with each input and output pin connected to 0.5 sq. in pad of 2 oz copper. Fig. 3: F2410 - Differential mode attenuation, 0.2-100MHz. Source and load resistance 50 . Vertical scale: 10dB/div, with zero level marked by arrow. No load, 25C F4810/F2410 FDS (Preliminary) Ver 2 08-14-03 To check filter thermal characteristic in an actual system environment, attach a thermocouple to the top of differential inductor, L2; it is the INDUCTOR closest to OUT+ pin. The maximum temperature at this test point should not exceed 120C, and a minimum of 5-10C headroom is suggested for better reliability. USA Toll Free 866 WOW-didt Page 3 of 6 F4810/F2410 Input EMI-Filter 10 A Output Preliminary Data Sheet A typical application schematic is shown in Fig. 5. Either filter can be used to power one or more converters. Maximum filter output current should be limited 10A - or less - depending upon system thermal environment. where: IREQ'd(filter) Pi,OUT(converter) The required filter current drawn by the converter loads, IREQ'd(Filter), will be the sum of the loads of all connected converters: IREQ'd(filter) = [Pi,OUT/(VIN, min * i, min)] [A] maximum required filter current converter output power, i=1, 2... = Vi,OUT(converter) * Ii,OUT(converter) VIN, min converter input voltage i, min converter minimum efficiency, i=1, 2,... For applications requiring a filter current greater than 10A, divide the converters into smaller groups and use multiple filters. Do not connect filters in parallel. C4 VIN+ P1 +Vout +48V P3 Vin (+) F4810 + C1 C2 Input Filter (Top View) VIN- P2 -48V QmaX TM Series Converter (Top View) ON/OFF -Vout Vout (+) SENSE (+) TRIM C8 Rload1 C9 Rload2 P4 SENSE (-) F1 12A Vin (-) Vout (-) C5 C6 For further information regarding connection of CM capacitors and other pertinent layout and EMC information, please refer to di/dt Application notes AN100 and AN101. Vin (+) C3 QmaX TM Series Converter (Top View) Vout (+) SENSE (+) TRIM ON/OFF SENSE (-) Vout (-) Vin (-) C7 Fig. 5: F4810 - Typical application For additional information regarding layout and EMC, refer to di/dt Application notes AN100 and AN101. The following bulleted items are considerations regarding the external components for the typical application shown in Fig. 5. F4810/F2410 FDS (Preliminary) Ver 2 08-14-03 * Input electrolytic capacitor C1. We recommend 1-2 F/W for 48V applications, and 2-4 F/W for 24V applications. This capacitor is needed to ensure stability of converters in presence of their negative input impedance characteristic. Note that electrolytic capacitors at -40C have 3-5 times less capacitance than at room temperature, and therefore it is good practice to check the power system at worst case conditions from this point of view, i.e. lowest USA Toll Free 866 WOW-didt Page 4 of 6 F4810/F2410 Input EMI-Filter 10 A Output If connection of capacitors between input and output is prohibited because of system restrictions, connect Ycapacitors only from each input pin to system ground. The value of these capacitors in this case is "the bigger the better" (preferably 0.1F or larger). Voltage rating of Y-capacitors depends on the system isolation and safety requirements. ambient temperature, minimum input voltage, and maximum load. If electrolytic capacitors are restricted for use in the system, please contact the factory. * Input capacitors C2, C3 are optional; they decrease input ripple current and improve EMI. One or two of the following ceramic chip capacitors, as required, per converter are recommended: TDK C4532X7R2A105, 1.0 F, 100V - for 48V applications TDK C4532X7R1H475, 4.7 F, 50V - for 24V applications * Common-mode capacitor (Y-cap) values and their EMI attenuation effects depend on system grounding and layout (they are not shown on Fig. 5). In EMI testing with the filter, ceramic capacitors between input and output of the converter (C4 - C7) were very helpful. Typical values for the capacitor between Vin- and Vout- are 3,300pF - 5,100pF, and for the capacitor between Vin+ and Vout+, 0 to 3,300pF. Preliminary Data Sheet * Output capacitors C8, C9 are optional to reduce output ripple. Addition of one-two 47F ceramic capacitors, for example, for low voltage applications 3.3V and below, significantly decreases output ripple from 25-40mV peakto-peak to 5-10mV. Recommended capacitor for these low voltage applications is C3225X5ROJ476 from TDK. * UL testing was performed with a 12A fuse (R451012 from Littelfuse). Fuses larger than 12A should not be used. Smaller value fuses can be used as required for protection to a lower power limit. Physical Information Pin Connections TOP VIEW Pin # +IN -IN -OUT +OUT +IN Function Vin (+) Vin (-) Vout (-) Vout (+) +OUT -OUT -IN SIDE VIEW F4810/F2410 FDS (Preliminary) Ver 2 08-14-03 * All dimensions are in inches [mm] * Connector Material: Copper * Connector Finish: Gold over Nickel Optional: Tin/Lead over Nickel * Converter Weight: 0.34 oz [9.5 g] * Recommended Surface-Mount Pads: Min. 0.080" x 0.112" [2.03 x 2.84] USA Toll Free 866 WOW-didt Page 5 of 6 F4810/F2410 Input EMI-Filter 10 A Output Preliminary Data Sheet Filter Part Numbering Scheme Product Series Input Voltage Rated Load Current F 48 10 Filter Module 48: 80 V 24: 45 V 10 Adc Connector Finish - S Tape and Reel - R No letter Gold Plated No letter Bulk S Tin/Lead Plated R Tape and Reel The example above describes P/N F2410-S-R: 0-45 V input, 10 A output current, Tin/Lead plated connector, tape and reel. Please consult factory regarding availability of a specific version. For more information please contact di/dt, a Power-One company 1822 Aston Avenue ** Carlsbad, CA ** 92008 ** USA USA Toll Free 866-WOW-didt (969-3438) www.didt.com ** support@didt.com The information and specifications contained in this data sheet are believed to be accurate and reliable at the time of publication. However, di/dt, Inc. assumes no responsibility for its use or for any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of di/dt, Inc. Specifications are subject to change without notice. (c)Copyright di/dt, Inc. 2003 F4810/F2410 FDS (Preliminary) Ver 2 08-14-03 USA Toll Free 866 WOW-didt Page 6 of 6