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HA3905 Flyback Transformer

for Microsemi PoE PD Power supply

RoHS compliant
  • Developed for use with Microsemi UC3844 Current Mode Controller and LX1752 Buck Regulator
  • T1 on PoE PD Power Supply Evaluation Board (AN-37)
Buy Now:
Count Unit price
1 $2.07
175 $1.98
700 $1.65
1400 $1.37
2800 $1.20
5000 $1.04

For high volume or non-stock items, request a quote.

. in stock, ready to ship today.
Request a Sample:

Typical Application

Works with Microsemi UC3844

Input Voltage Output 1 Power Fsw
Sec Aux
36 V 57 V 5 V , 2.5 A 12 V , 0.02 A 12.5 W 200 kHz

Specifications

Electrical specifications at 25°C.

Part number 2
(Hover for schematics)
Inductance
at 0A (µH) 3
(Tolerance: ±10%)
Inductance
min at   1.2 A (µH)
DCR max (Ω) Leakage
Inductance
max (µH) 4
Turns Ratio Isolation
Voltage (Vrms) 5
Pri Sec Aux Reset Pri : Sec : Aux : Reset
HA3905-CL_ 27.0 24.3 0.170 0.015 0.385 0.371 1.9 1 : 0.267 : 0.735 : 1 1500
Notes
  1. Output of the seconday is with the windings connected in parallel.
  2. When ordering, please specify packaging code: HA3905-CLD.
  3. Inductance is for the primary, measured at 250 kHz, 0.1 Vrms, 0 Adc.
  4. Leakage inductance measured on the primary winding with all secondary pins shorted.
  5. 1500 Vrms,one minute isolation from primary, auxiliary and reset to secondary;
    500 Vrms, one minute isolation from primary and reset to auxiliary

Termination:

  • RoHS-compliant. 260°C compatible. Tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations. Other terminations available at additional cost.

Packaging:

  • D = 13″ machine-ready reel. EIA-481 embossed plastic tape (175 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
  • B = Less than full reel. In an effort to simplify our part numbering system, Coilcraft is eliminating the need for multiple packaging codes. When ordering, simply change the last letter of your part number from B to D.
Environmental
Environmental:
RoHS compliant
Ambient temperature range:
-40°C to +85°C
Storage temperature range:
Component: –40°C to +85°C.
Tape and reel packaging: –40°C to +80°C
Failures in Time (FIT) / Mean Time Between Failures (MTBF):

Schematics

ha3905s.gif

Secondary windings to be connected
in parallel on the PC board

Physical characteristics

ha3905d.gif


dims_inches_mm-(6).gif

Tape and Reel specification

tapereel_pl-(1).gif
 
Parts per reel Reel dimensions (mm) Tape dimensions (mm) Orientation
13" (330 mm) A B C D E W P Po P1 H T part_or_c-(9).gif
175 330 100 13 38,4 32,4 32 28 4 2 12,93 0,5

General specification

Core Material:
Ferrite
Weight:
6.7 g
Packaging:
175 per 13″ reel Plastic tape: 32 mm wide, 0.5 mm thick, 28 mm pocket spacing, 12.93 mm pocket depth

Soldering/Washing

Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
t Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles
Refer to Soldering Coilcraft Components before soldering.
PCB Washing:
Only pure water or alcohol recommended

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