Document 328-1 Planar Magnetics For National Semiconductor LM5041 IC This planar transformer and inductor pair were designed specifically for National Semiconductor’s LM5041 IC. The A9786-A transformer is engineered for use in highcurrent telecom power supply applications that require high efficiency in a low-profile package.The auxiliary winding can be used to control input current to PWMs. It offers very high current handling capability and extremely low DC resistance in a low profile package. Coilcraft’s A9787-A inductor is designed as the output choke for the LM5041. Planar magnetics offer high power densities along with great reliability and repeatability. Windings are etched into a printed circuit board, ensuring high efficiency and consistency. Request free evaluation samples by contacting Coilcraft or visiting www.coilcraft.com. Transformer Part Output number1 power (W) A9786-AL_ 150 Input voltage range (V) 36 – 75 Output voltage (V) 2.5 Output current (A rms) 60.0 Primary inductance1 min (mH) 1.25 1. When ordering, please specify packaging code: A9786-ALD Packaging: D = 13″ machine-ready reel. EIA-481 embossed plastic tape (125 parts per full reel). B = Less than full reel. In tape, but not machine ready. To have a leader and trailer added ($25 charge), use code letter D instead. Leakage inductance2 max (µH) 0.90 DCR max (mOhms) Primary: 62.5 (1 – 3) Secondary: 0.91 (5,6 – 9,10) 200 (4 – 11) Pri/sec isolation (Vdc) 1100 2. Inductance measured on an Agilent/HP 4284 between pins 1 and 3 at 250 kHz, 0.1 Vrms, 0 Adc. 3. Leakage inductance measured between pins 1 and 3 at 100 kHz, 0.1 Vrms, 0 Adc with all secondary pins shorted. 4. Operating temperature range: –40°C to +85°C. 5. Electrical specifications at 25°C. 5,6 0.45 max 11,43 1T 1 0.004 /0,10 1.48 max 37,59 5 3 4 1.23 max 2 31,24 1 1 0.285 7,24 10 PRI 0.075 쏗 1,91 9,10 4 3 10 11 0.31 7,87 2 5 Recommended Land Pattern AUX 4T 11 4 0.12 3,05 0.175 4,45 Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2008 1T 2 8T 3 11 7,8 SEC 8T 1.32 33,53 1.21 30,73 1.15 29,21 Weight: 33.4 g Terminations: Matte tin over nickel over brass Tape and reel: 125/13″ reel 56 mm tape Document 328-1 Revised 06/09/08 Document 328-2 Planar Magnetics for National Semiconductor LM5041 Output Inductor Inductance2 @ 0 Adc (µH) 57 ±7% Part number1 A9787-AL_ Inductance2 @ 7.5 Adc min (µH) 47.0 DCR max (mOhms) 17.0 1. When ordering, please specify packaging code: A9787-ALD Packaging: D = 13″ machine-ready reel. EIA-481 embossed plastic tape (125 parts per full reel). B = Less than full reel. In tape, but not machine ready. To have a leader and trailer added ($25 charge), use code letter D instead. Typical L vs Frequency Isat4 (A) 8.1 Irms5 (A) 12.0 2. Inductance measured on an Agilent/HP 4284 at 250 kHz, 0.1 Vrms. 3. From pins 1,2 to core. 4. DC current at which inductance drops 10% (typ) from its value without current. 5. Average current for a 40°C rise above 25°C ambient. 6. Operating temperature range: –40°C to +85°C. 7. Electrical specifications at 25°C. Typical L vs Current 1000 Inductance (µH) 1000 Inductance (µH) Isolation3 (Vdc) 1100 100 10 100 10 1 1 1 0.1 10 100 1000 10000 0.1 Frequency (MHz) 10 1 100 Current (A) 1,2 0.45 max 11,43 0.004 /0,10 3,4 For mounting stability only 1.30 max 37,59 1.145 29,08 0.12 3,05 For mounting stability only 1 4 1.23 max 31,24 0.34 8,64 0.30 7,62 4 1 0.075 쏗 1,91 Recommended Land Pattern Weight: 31.0 g Terminations: Matte tin over nickel over brass Tape and reel: 125/13″ reel 56 mm tape Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2008 Document 328-2 Revised 06/09/08