specifications subject to change without notice. please check our website for latest information. document 328-1 document 328-1 revised 01/27/05 transformer 1. inductance measured on an agilent/hp 4284 between pins 1 and 3 at 250 khz, 0.1 vrms, 0 adc. 2. leakage inductance measured between pins 1 and 3 at 100 khz, 0.1 vrms, 0 adc with all secondary pins shorted. 3. operating temperature range: ?40c to +85c. 4. electrical specifications at 25c. input output primary leakage pri/sec part output voltage output current inductance 1 inductance 2 dcr max isolation number power (w) range (v) voltage (v) (a rms) min (mh) max (h) (mohms) (vdc) A9786-AL 150 36 ? 75 2.5 60.0 1.25 0.90 primary: 62.5 (1 ? 3) 1100 secondary: 0.91 (5,6 ? 9,10) 180.0 (4 ? 11) planar magnetics this planar transformer and inductor pair were designed specifically for national semiconductor?s lm5041 ic. the a9786-a transformer is engineered for use in high- current 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 t he 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. for national semiconductor lm5041 ic 11 4 1 2 5,6 3 9,10 7,8 pri sec 8t 8t 1t 1t 4t aux 0.45 11,43 1.23 31,24 0.285 7,24 0.31 7,87 0.175 4,45 0.12 3,05 1.48 37,59 1.32 33,53 1.21 30,73 1.15 29,21 max max max 0.004 /0,10 recommended land pattern 0.075 0,19 1 1 11 11 10 10 2 2 3 3 4 4 5 5 terminations: nickel/tin over brass
planar magnetics for national semiconductor lm5041 specifications subject to change without notice. please check our website for latest information. document 328-2 document 328-2 revised 01/27/05 output inductor 1. inductance measured on an agilent/hp 4284 at 250 khz, 0.1 vrms. 2. from pins 1,2 to core. 3. dc current at which inductance drops 10% (typ) from its value without current. 4. average current for a 40c rise above 25c ambient. 5. operating temperature range: ?40c to +85c. 6. electrical specifications at 25c. inductance 1 inductance 1 part @ 0 adc @ 7.5 adc dcr max isolation 2 i sat 3 i rms 4 number (h) min (h) (mohms) (vdc) (a) (a) a9787-al 57 7% 47.0 17.0 1100 8.1 12.0 1 10 100 1000 0.1 10 100 1000 10000 1 inductance (h) frequency (mhz) 1 10 1000 100 0.1 1 100 10 current (a) inductance (h) typical l vs frequency typical l vs current 0.45 11,43 1.23 31,24 0.30 7,62 0.34 8,64 0.12 3,05 for mounting stability only for mounting stability only 1.30 37,59 1.145 29,08 1 1 4 4 max max max 0.004 /0,10 recommended land pattern 0.075 0,19 1,2 3,4 terminations: nickel/tin over brass
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