Characteristic
The above transformers are widely used in switching power supply and have the following characteristics：
Use frequency：25-500kHZ
Power range：10-500W
High permeability, high efficiency, low leakage, good heat dissipation, small electromagnetic interference
Magnetic core：EE、EC、EI、EF、EER、ED、EFD、PQ、RM
Magnetic core material：SP3、SP4、SP4A
Installation: can be designed according to customer requirements
Applications
Various switching power supply: dc-dc, ac-dc-ac, dc-ac,UPS power supply, etc
Circuit form: forward excitation, back excitation, push pull, half bridge, full bridge circuit, etc
Used for power supply of communication, TV, air conditioner and computer. Switching power supply in all kinds of electronic equipment。
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EC28 vertical 10-pin transformer | EC35 horizontal 14-pin transformer |
Series specification sheet
model | A±2.0 | B±2.0 | D±2.0 | F±0.3 | G±0.5 | PIN |
EC25-1 | 25.0 | 22.0 | 20.0 | 5.0 | 12.5 | 4+4 |
EC28/28-1 | 29.0 | 30.0 | 23.0 | 5.0 | 17.5 | 5+5 |
EC28-28-2 | 30.0 | 24.5 | 30.0 | 5.0 | 25.0 | 6+6 |
EC28/34-1 | 30.0 | 36.0 | 24.0 | 5.0 | 17.5 | 5+5 |
EC28/34-2 | 30.0 | 27.0 | 39.0 | 5.0 | 30.0 | 6+6 |
EC35-1 | 40.0 | 46.5 | 30.5 | 5.0 | 25.0 | 8+8 |
EC35-2 | 36.5 | 29.5 | 41.5 | 5.0 | 34.0 | 7+7 |
EC39/40-1 | 40.5 | 45.0 | 29.5 | 5.0 | 25.0 | 7+7 |
EC40-1 | 40.5 | 48.0 | 31.0 | 5.0 | 25.0 | 8+8 |
EC40-2 | 40.0 | 27.5 | 44.0 | 5.0 | 35.0 | 8+8 |
EC42/15-1 | 45.0 | 48.0 | 31.0 | 5.0 | 25.0 | 9+9 |
EC40/20-1 | 45.0 | 48.0 | 37.5 | 5.0 | 32.0 | 9+9 |
EC42-1 | 44.0 | 35.0 | 45.0 | 5.0 | 35.0 | 8+8 |
EC49/42-1 | 50.5 | 47.5 | 37.5 | 5.0 | 28.0 | 9+9 |
EC49/52-1 | 52.0 | 59.5 | 38.5 | 5.0 | 28.0 | 9+9 |
ETD34-1 | 34.5 | 26.5 | 35.5 | 5.0 | 25.5 | 7+7 |
ETD34 Double-groove | 35.5 | 25.0 | 35.5 | 5.0 | 28.0 | 6+6 |
ETD44 Double-groove | 36.5 | 26.0 | 44.5 | 5.0 | 37.5 | 7+7 |
ETD49 Double-groove | 51.5 | 34.5 | 50.5 | 5.0 | 43.0 | 10+10 |
ETD49 | 55.0 | 42.5 | 57.0 | 5.0 | 40.5 | 10+10 |
（1）典型电路
在开关电源电路中，常用的典型电路拓扑有：正激式、反激式、推挽式、半桥式（全桥）等。典型的三路输出正激变换器拓扑如下图。在直流输入电压为60-200V，输出功率为200W的场合，正激变换器可能是应用最广泛的拓扑。
三端输出正激变换器拓扑
反激变换器的典型电路图如下图，在5-150W的低成本电源应用中非常广泛，其最大优点就是不需要次级输出电感。
反激变换器拓扑
全桥变换器的典型拓扑如图所示，其广泛应用于输入网压为220V或更高应用场合，其主要优点是可以将变压器初级侧的漏感电压尖峰钳位于直流母线电压，且将漏感能量回馈到输入母线中。
全桥变换器拓扑
采用国际标准的质量体系认证、安全体系认证，让客户在使用中获得更大的质量与安全保障
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UL安全认证（公司系统、原料） |
RoHS环保认定（产品、原料） |
