Comparison of LAN Transformer With Chip Lan
In recent years, LAN ports have come standard not only for IT equipment such as computers, but also for everything from digital TVS
On AV devices. LAN transformer is the key component of LAN port. It's the key to transmitting pulse signals at high speeds
Function.
The new split transformer (CHIP LAN) is a solution for typical Ethernet applications. The innovative design uses equivalence
The circuit replaces the traditional LAN transformer. All components in the circuit can be manufactured automatically, and are SMD type, reducing the product
The model also eliminates the complicated process of the traditional network transformer.
Zhuhai Eastever Electronic Co., Ltd. applies and develops the technology accumulated in wound common mode inductor products, which is newly developed using all self
The dynamic winding process of the new separation transformer (CHIP LAN), to provide customers with more LAN port device supporting options.
| Functional characteristics | Chip LAN | Chip LAN | Traditional LAN | Notes |
| Signal transmission | Capacitor dc isolation | Electro magnetic coupling | Electromagnetic coupling | Chip Lan (capacitive type) : Signal propagation is carried out by means of capacitive isolation of DC signal and pulse signal principle Traditional LAN transformer &Chip LAN (inductive type) : Signal transmission is carried away by the electromagnetic coupling of the main transformer |
| High voltage isolation | / | Transformer | Transformer | Chip Lan (capacitive) : This function cannot be satisfied The traditional LAN transformer is met by insulated wire and insulating glue in the main transformer winding Chip LAN (inductive type) : meets through insulated wires in the main transformer windings |
| Impedance matching | Equivalent circuit of capacitor/common-mode inductor/self-coupling transformer | Transformer coil ratio | Transformer coil ratio | Chip Lan (capacitive) : CAP+CMC+AUTO C"FMR combined equivalent circuit Traditional LAN transformer &Chip LAN (inductive type) : primary and secondary winding turns ratio of the main transformer |
| Noise suppression | Common-mode inductor/self-coupling transformer | Center tap/ common mode inductor | Center tap/ common mode inductor/self - coupling transformer | The Chip Lan(capacitive)/ Traditonal LAN transformer /Chip Lan(inductive) is the same |
| POE Support | N/A | IEEE802.3af IEEE802.3af IEEE802.3bt | IEEE802.3af IEEE802.3at IEEE802.3bt | The traditional LAN transformer /Chip Lan (inductive type) is the same |
| Surger Protect | Self-coupled transformer | Transformer Bob Smith Circuit | Transformer Bob Smith Circuil | Chip Lan(capacitive) uses a self-coupled transformer to provide a low impedance conduction to a Surge common-mode pulse The traditional LAN transformer / Chip Lan (inductive type) uses the transformer for isolation, 2Kv capacitor protection TVS should be added to clamp if necessary. |
Automatic winding & spot welding Automatic dispensing & Assembly & baking Automatic test package
一、Test scheme
1. Traditional 10/100Base-Tx transformer: ES16503G
2. Inductive LAN transformer: CMF-4532B-201MGN+LC-2012A-801T0
3.Capacitive LAN transformer:CMF-3216A-600M0+LC-2012A-801T0
Quantity: 10 groups of data each.
二、Test method
1. Traditional transformer: direct single unit test.
2. Inductive LAN transformer & Capacitive LAN transformer: inductive network becomes a 4532 and a 2012 combined to form a whole, capacitive network becomes a 3216 and a 2012 combined to form a whole, so it needs to be welded on the PCB board for testing as shown in the figure below:
Traditional Transformer Inductive LAN transformer Capacitive LAN transformer
| Test Item | OCL/LX(uH) | LK(uH) | ||||||||
Test Conditions | 100KHZ,0.1V with 8mA DC Bias | 100KHZ,0.1V | ||||||||
traditional type (sensing value of main transformer) | 621 | 535 | 592 | 581 | 531 | 0.15 | 0.18 | 0.14 | 0.13 | 0.16 |
| 559 | 592 | 521 | 540 | 569 | 0.17 | 0.13 | 0.15 | 0.14 | 0.17 | |
Inductive type (sensing value of main transformer) | 288 | 284 | 301 | 260 | 287 | 0.30 | 0.22 | 0.28 | 0.26 | 0.25 |
| 298 | 317 | 278 | 293 | 280 | 0.24 | 0.24 | 0.23 | 0.22 | 0.25 | |
Capacitive type (sensing value of main transformer) | 252 | 258 | 255 | 260 | 258 | NA | ||||
| 260 | 251 | 253 | 254 | 254 | ||||||
| Test Item | DCR(Ω） | |||||||||
| Test Conditions | Because the inductance and capacitance products are welded to the PCB test board for testing, the measured resistance values include the parasitic parameters on the PCB board | |||||||||
| Traditional type | 0.55 | 0.55 | 0.55 | 0.55 | 0.53 | 0.55 | 0.53 | 0.54 | 0.53 | 0.54 |
Inductive type | 2.39 | 2.39 | 2.51 | 2.42 | 2.69 | 2.42 | 2.38 | 2.53 | 2.47 | 2.40 |
| Capacitive type | 2.43 | 2.55 | 2.46 | 2.60 | 2.56 | 2.60 | 2.50 | 2.45 | 2.49 | 2.50 |
Notes：For low frequency parameters, the access inductance & resistance of the traditional LAN transformer is better than that of inductive and capacitive schemes.
Sum up:
According to the above data comparison of traditional Lan transformer, inductive Lan transformer and capacitive Lan transformer:
1. In terms of low-frequency parameters, the parameters of the traditional Lan transformer access system are better than those of capacitive and inductive Chip Lan schemes;
2. From the perspective of high-frequency data,
a. Consistency: inductive and capacitive data consistency is better than traditional Lan transformers;
b. Parameter performance: The performance of plug loss and return loss parameters capacitive and inductive Lan transformers is better than that of traditional Lan transformers, and the performance of CMRR parameters traditional Lan transformer is better than the other two.
3. POE performance
a. Chip Lan inductance scheme has the same performance as conventional transformers, up to 90W depending on selection.
b. The Chip Lan capacitor scheme is not usually used in POE circuits.
4. Surge Protect
A. Chip Lan(capacitive) uses a self-coupled transformer to provide low-impedance ground conduction for Surge common-mode pulses, with the lowest cost protection solution and up to 6Kv support.
b. The traditional network transformer /Chip Lan(inductive type) uses the transformer for isolation, and TVS should be increased when necessary for 2Kv capacitor protection
Row clamp, relatively high cost.
