Document 465 Planar Transformer For National Semiconductor LM5032 PWM Controller The C1539-AL was developed specifically for the National Semiconductor LM5032 dual interleaved current mode PWM controller. This planar transformer can be used in a dual forward converter or in both interleaved power stages of a high-current converter in applications up to 100 Watts. Its low leakage inductance and excellent dc resistance provide very high efficiency. Primary to secondary isolation is 1500 Vdc. Free evaluation samples of C1539-AL are available by contacting Coilcraft or by visiting www.coilcraft.com. Part number1 C1539-AL_ Output power (W) 100 Output voltage nom (V) 12 Output current (A rms) 8.33 Primary inductance2 min (µH) 320.0 1. When ordering, specify a packaging code: C1539-ALD Packaging: D = 13″ machine ready reel. EIA-481 embossed plastic tape (200 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 inductance3 max (µH) 0.25 C1539-AL 4 5 10 9 8 7 6 Primary 2 9 4 7 Secondary 9 4 0.190 4,83 0.080 Ø 2,03 0.920 max 23,37 0.360 max 9,14 0.006 /0,15 Recommended Land Pattern Weight: 10.2 g Terminations: Matte tin over nickel over brass Tape and reel: 200/13″ reel 44 mm tape width Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2006 Pri/sec Isolation (Vdc) 1500 7 2 0.820 20,83 20,57 Turns ratio pri : sec 2:1 2. Inductance measured on an Agilent/HP 4284 between pins 2 and 4 at 250 kHz, 0.1 Vrms, 0 Adc. 3. Leakage inductance measured between pins 2 and 4 at 100 kHz, 0.1 Vrms, 0 Adc with pins7 and 9 shorted. 4. Storage and ambient operating temperature range: –40°C to +85°C. 5. Electrical specifications at 25°C. Dot indicates pin 1 1 2 0.810 max 3 DCR max (mOhms) pri: 63.0 sec: 15.0 Document 465 Revised 12/06/06