Document 439

Flyback Transformers

For Texas Instruments TPS23750
PoE Powered Device Controller• Isolated synchronous flyback transformers developed for Texas
Instruments PMP929 reference design.
• Operates up to 500 kHz with 18 – 72 V input• 1500 Vrms, one minute isolation primary and bias to secondaryCore material Ferrite
Terminations RoHS tin-silver (96.5/3.5) over tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight 5.0 – 5.3 g
Ambient temperature –40°C to +125°CStorage temperature Component: –40°C to +125°C.
Tape and reel packaging: –40°C to +80°C
Resistance to soldering heat Max three 40 second reflows at+260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /85% relative humidity)
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
Packaging 200 per 13″ reel Plastic tape: 44 mm wide,
0.35 mm thick, 28 mm pocket spacing, 9.6 mm pocket depth
PCB washing Tested to MIL-STD-202 Method 215 plus an additionalaqueous wash. See Doc787_PCB_Washing.pdf.

Leakage L5				 L at 0 A2 L at Ipk3					 max (µH)		
Turns ratio 	 Part±10%min		DCR max (Ohms)
Ipk3
number1 (µH)(µH)
pri
sec4 drive bias pri  drive pri: sec6 pri : drive pri : bias (A)C1173-AL_ 166.5
C1174-AL_ 150.0
GA3562-BL_166.5

150.0
135.0
150.0

0.770 0.020 0.523 1.12 2.50
0.515 0.023 0.570 0.88 2.00
0.740 0.100 0.456 1.15 2.050.400
0.4000.245

1. When ordering, please specify packaging code:
Packaging:

C1174-ALD
D = 13″ machine ready reel. EIA-481 embossed plastic
tape (200 per full reel). Quantities less than full reelavailable: in tape (not machine ready) or with leader
and trailer ($25 charge).
B = Less than full reel. In an effort to simplify our partnumbering system, Coilcraft is eliminating the needfor multiple packaging codes. When ordering, simply
change the last letter of your part number from B to D.

2.0 : 1
1.2 3.3 V, 3 A 5.6 V, 10 mA
2.25 : 1 	 1.2 5.0 V, 2 A 7.5 V, 10 mA
2.0 : 1
1.2 12 V, 0.83 A 6.0 V, 10 mA

2. Inductance is for the primary, measured at 100 kHz, 0.1 Vrms.
3. Peak primary current drawn at minimum input voltage.
4. DCR for secondary is with windings connected in parallel.
5. Leakage inductance for the primary is with the secondary and drive
windings shorted; leakage inductance for the drive winding is with thesecondary windings shorted.
6. Turns ratio is with both secondary windings connected in parallel.
7. Output of the secondary is with the windings connected in parallel. Bias
winding output is 10 V, 20 mA.
8. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.

1211C117x-AL

Primary

Secondary

XXXX Y52

9108Bias

Drive

17

1

12

6

70.865 max
21,97

0.135
3,430.028
0,72

10.0982,50.665
16,88

12

Recommended
Land Pattern

0.07
1,790.098
2,5Parts manufactured priorto December 2011 may
be marked differently.

0.335 max
8,510.590
14,980.079
2,013.7 : 1
3.2 : 14.0 : 1Driveoutput

3Dot indicates pin 1

0.677 max
17,20

6.5 : 1
5.0 : 12.0 : 1

Output7

0.693
17,60

The secondary windings are to beconnected in parallel on the PC board.

0.004 /0,10

Dimensions are ininchesmm

US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg

Document 439

Revised 12/21/11© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.