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Forward Mode Transformer

for 25 Watt Applications

RoHS compliant
  • Developed for Texas Instruments TPS23754 PWM Controller
  • Designed for forward topology operating at 250 kHz
Buy Now:
Count Unit price
1 $3.72
175 $2.96
700 $2.58
1400 $2.01
2800 $1.72
5000 $1.57

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

. in stock, ready to ship today.
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Typical Application

Works with Texas Instruments TPS23754

Input Voltage Output 1 Power Fsw
20 V 57 V 5 V , 4.8 A 25 W 250 kHz

Specifications

Electrical specifications at 25°C.

Part number Inductance
min (µH) 2
DCR max (mΩ) 3 Leakage
Inductance
max (µH) 4
Turns Ratio 5 Isolation
Voltage (Vrms) 6
Pri Sec Bias Pri : Sec : Bias
WA8515-ALD 90 146 25 494 0.816 1 : 0.406 : 0.813 1500
Notes
  1. Output is with the secondary windings connected in parallel. Bias winding output is 12 V, 20 mA.
  2. Inductance measured at 250 kHz, 0.1 Vrms, 0 Adc.
  3. DCR for the secondary is measured with the windings connected in parallel. For other operating temperatures, use this DCR at Temperature calculator.
  4. Leakage inductance is for the primary and is measured with the secondary shorted.
  5. Turns ratio is with the secondary windings connected in parallel. 
  6. 1500 Vrms one minute isolation primary and bias to secondary.

Coilcraft.Products.LeadLength:

  • RoHS-compliant. 260°C compatible. Tin-silver-copper over tin over nickel over phos bronze.

Termination:

  • RoHS tin-silver-copper over tin over nickel over phos bronze. Other terminations available at additional cost.
Environmental
Environmental:
RoHS compliant
Ambient temperature range:
−40°C to +85°C
Storage temperature range:
Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
Maximum part temperature:
+125°C (ambient + temperature rise)
Failures in Time (FIT) / Mean Time Between Failures (MTBF):
Calculated per Telcordia SR-322 26,315,789 hours / 38 per billion hours

Schematics

wa8515s.gif
Secondary windings to be connected
in parallel on PC board.

Physical characteristics

wa8515d.gif

dims_inches_mm.gif

Tape and Reel specification

tapereel_pl.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_f.gif
175 330 100 13 38,4 32,4 32 28 4 2 13,4 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, 13.40 mm pocket depth

Soldering/Washing

Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
Max three 40 second reflows at +260°C allowing parts to cool to room temperature between cycles.
Refer to Soldering Coilcraft Components before soldering.
PCB Washing:
Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.