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Shenzhen Dowis Electronics Co.,Ltd
5 Years
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| Brand Name : | Dowis |
| Model Number : | EF25, EFSeries |
| Certification : | CE, UL, RoHs, ISO9001, 16949 |
| Payment Terms : | T/T, L/C |
| Delivery Time : | 3-4Weeks |
10KHz EF25 HF Transformer 280µH
Features:
1. High quality and Competitive price
2. Good after-sale service
3. High-temperature resistant
4. Supply samples free with the short delivery time
5. Suitable for a wide range of switching power supply/power
transformer/ LED driver transformer/current
transformer/distribution transformer
1. Drawing (Unit: mm)
2. Winding Method
3. Winding System Requires
| Winding | Retaining wall | PIN Position | WIRE&DESCRIPTION | TS | Winding Method | Slot Position | Insulation tape | Tube | Into the shaft way | Direction | ||||||||
| Pin1-5 side slot | Pin6-9 side slot | Start | End | Start | End | Tape Specification | TS | Start | End | |||||||||
| N1 | / | / | (2) | 5 | 2UEW-F,φ0.10mm×30 bars(Litz) | 36 | PIN1-5 side slot tightly wind for 5 layers+equally wind for 1 layer | Between Pin1.2 | Between Pin4.5 | 0.025×7mm | 2.1 | 18L×10mm | / | Pin1 towards left | front | |||
| N2 | / | / | 3 | 4 | 2UEW-F,φ0.28mm×1 bars | 4 | PIN1-5 side slot tightly wind in the middle | Between Pin2.3 | Between Pin3,4 | / | / | / | / | |||||
| N3 | / | / | 9 | 7 | 2UEW-F,φ0.10mm×90 bars(Litz) | 4 | PIN6-9 side slot tightly wind, The inlet and outlet wires should be wrapped with 8 × 10mm high temperature adhesive tape for 1 layer | Between Pin8.9 | Between Pin7.8 | / | / | / | / | |||||
| N4 | / | / | 8 | 6 | 2UEW-F,φ0.10mm×90 bars(Litz) | 4 | PIN6-9side slot tightly wind, The inlet and outlet wires should be wrapped with 8 × 10mm high temperature adhesive tape for 1 layer | Between Pin7.8 | Between Pin6,7 | 0.025×7mm (wrap) | 1.1 | / | / | |||||
4. Electrical characteristics
| Item | Test Terminal | Test Condition | Standard Requirement | Equipment | |||||||
| Semi-finished products | Finished Products | QC | |||||||||
| Inductance Test | 2 | 5 | 10KHz,0.1V | 280uH±7% | 280uH±9% | 280uH±10% | TH1062 or Equal | ||||
| Leakage Test | 2 | 5 | 100KHz,0.1V (short circuit Pin6+7+8+9) | 90uH max | 90uH max | 90uH max | |||||
| Capacitance test | Pin2+3+4+5 | Pin6+7+8+9 | 100KHz,0.1V | 9.0pF max | 9.0pF max | 9.0pF max | |||||
| Direct Currency Resistance | 2 | 5 | DC 25℃ | 160mΩ max | 160mΩ max | 160mΩ max | TH2511 or Equal | ||||
| 3 | 4 | 88mΩ max | 88mΩ max | 88mΩ max | |||||||
| 8 | 6 | 6.8mΩ max | 6.8mΩ max | 6.8mΩ max | |||||||
| 9 | 7 | 6.1mΩ max | 6.1mΩ max | 6.1mΩ max | |||||||
| TS Test | All winding | 20KHz,1V | 36:4:4:4(±0.2Ts) | CH3250 or Equal | |||||||
| Short circuit test | Pin6-7 | ||||||||||
| Voltage Test | Pin2+5 to Pin3+4 | AC-50Hz-3mA | 1500V,2 Sec | 1500V,2 Sec | 1500V,5 Sec | CJ2670 or Equal | |||||
| Pin9+7 to pin8+6 | AC-50Hz-3mA | 500V,2 Sec | 500V,2 Sec | 500V,5 Sec | |||||||
| Pri to Core | AC-50Hz-3mA | 1500V,2 Sec | 1600V,2 Sec | 1500V,5 Sec | |||||||
| Pri to Sec | AC-50Hz-3mA | 4000V,2 Sec | 4100V,2 Sec | 4000V,5 Sec | |||||||
| Sec to Core | AC-50Hz-3mA | 2000V,2 Sec | 2100V,2 Sec | 2000V,5 Sec | |||||||
Shenzhen Dowis Electronics Co., Ltd. is a professional manufacturer
of electronic transformers, inductors, and filters integrating
R&D, production, and sales. It is a national high-tech
enterprise and has passed the IATF16949:2016 automotive industry
quality management system certification, the product has passed the
"UL" CQC" and other safety certifications. The products are widely
used in communication equipment, new energy vehicles, industrial
control equipment, high-power LED drives, and other market areas.
The industry has high visibility. In addition to the domestic
market, but also exported to many countries in Europe and the
United States.
In order to further expand production capacity, it has set up a special test area construction area in Zhaoqing YueGui cooperation in 2018 of 14000 square meters of manufacturing center named ZhaoQing Sheng Xiang electronic technology co., Ltd. Its management technical team has rich experience in cooperating with customers from well-known domestic enterprises and overseas. The design of products can fully follow customer’s needs and services with a good quality control system, and it has been recognized by many famous enterprises as the core supplier. We look forward to cooperating with you.
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