Document 268
with For use ily 8C4x fam IC3 Micrel M
Flyback Transformer – U6939-C
Schematic
1 8
This product is not RoHS-compliant. Contact Coilcraft for current status or possible alternatives. This transformer has been specially designed to meet the requirements of Micrel’s MIC38C4x family of BiCMOS current-mode PWM controllers. Free evaluation samples can be requested by contacting the Coilcraft sales office nearest you.
Part number U6939-C Inductance1 ±8% (µH) 380 DCR max (Ohms) (1-2) 0.580 (3-4) 0.120 (7-8) 0.011 Isolation (Vrms) (1-7,core) 2500 (1-3) 500 (3,7-core) 500
C Pri
Sec
2 3 7
Ter D
4
Recommended Board Layout
A
4 5
E
F B
1. Inductance is for the primary, measured at 100 kHz, 1.0 Vrms, 0 Adc. 2. Operating temperature range -40°C to +85°C. 3. Electrical specifications at 25°C.
1
8
0.047 0,12
A max 0.710 18,03
B max 0.930 23,62
C max 0.810 20,57
D nom 0.280 7,11
E 0.492 1,25
F 0.197 1,50 inches mm
Specifications subject to change without notice.
Document 268
Revised 9/10/01
© Coilcraft, Inc. 2007
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