SMT Flyback Transformer for
Microsemi PoE PD Power Supply
- Developed for use with Microsemi UC3844 Current Mode Controller and LX1752 Buck Regulator
- T1 on PoE PD Power Supply Evaluation Board (AN-37)
- Designed for 36 V to 57 V input; 200 kHz.
- 1500 Vrms,one minute isolation from primary, auxiliary and reset to secondary;
500 Vrms, one minute isolation from primary and reset to auxiliary - RoHS-compliant. 260°C compatible. Tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations
SPECIFICATIONS
Schematic
Dimensions 
Tape and reel specifications 
3D model
| Part number1 Click to get parts |
L at 0A2 ±10% (µH) |
L at Ipk3 min (µH) |
DCR max4 (Ohms) |
Leakage L max (µH)5 |
Turns ratio | Ipk3 (A) |
Output6 | ||
|---|---|---|---|---|---|---|---|---|---|
| pri : sec | pri : aux | pri : reset | |||||||
| HA3905-CL_ | 27.0 | 24.3 | 0.170 (pri) 0.015 (sec) 0.385 (aux) 0.371 (reset) |
1.9 | 3.75 : 1 | 1.36 : 1 | 1 : 1 | 1.2 | 5 V, 2.5 A |
| 1 | When ordering, please specify termination and packaging codes: e.g. HA3905-CLD | |
| Termination: | L = RoHS compliant tin-silver over tin over nickel over phos bronze Special order, added cost: T = RoHS tin-silver-copper (95.5/4/0.5) or S = non-RoHS tin-lead (63/37). |
|
| Packaging: |
D = 13" reel, machine-ready EIA-481 embossed plastic tape (175parts 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. |
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| 2 | Inductance is for the primary, measured at 250 kHz, 1.0 Vrms, 0. | |
| 3 | Ipk: Peak primary current drawn at minimum input voltage. | |
| 4 | DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator. | |
| 5 | Leakage inductance for the primary is with all secondary pins shorted. | |
| 6 | Output is with the secondary windings connected in parallel. Auxiliary winding output is 12 V, 20 mA. | |
| 7 | Ambient temperature range: | −40°C to +125°C |
| 8 | Storage temperature range: | Component: −40°C to +125°C Tape and reel packaging: −40°C to +80°C |
| 9 | Electrical specifications at 25°C. | |
| Refer to Soldering Coilcraft Components before soldering. | ||
| PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info. | ||
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