AN313 SILABS | Alldatasheet
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Technical content
about 20 W of input power from the PSE. cable resistance will be decreased to support PoE Plus.
12.95 W input and then ne gotiating with the PSE for
the circuit shown in Figure 1. Figure 1. Internal Diode Bridge Bypass will help spread the heat in higher power applications. diodes for half the benefit at half the cost.
Si3400 and Si3401 ISO EVB user's guides.
- Input Ethernet transformer and jack:
commonly not integrated in the Ethernet RJ-45 jack.
- Recommended Options for Higher
isolated supply applications. Table 1. Recommended Options for Higher Power Applications
- EP13 is recommended for short circuit protection.
- Available output power will depend on minimum PSE voltage and maximum UTP cable resistance.
Rev. 0.2 3 5. Conclusion The Si3400 is designed for a maximum input power of 12.95 W, which is consistent with the IEEE 802.3af standard. Taking into acco unt cost-effective dc-dc converter implementations and high-efficiency performance, this results in a maximum output power of 10 W. For applications requiring more than 10 W output power, the Si3401 features an increased hot swap switch current limit of 470 mA (min imum). This allows the Si3401 to support 14 to 16 W applications with a small number of BOM modifications and by selecting an appropriate power supply topology. Si3401-EVB and Si3401IS O-EVB applicat ion boards are available with these recommendations. Complete circuit and performance data are documented in the corresponding user’s guides.
4 Rev. 0.2 DOCUMENT CHANGE LIST Revision 0.1 to Revision 0.2 Si3400 and Si3401 minimum hot swap switch current limits included.
Rev. 0.2 5 NOTES:
6 Rev. 0.2 CONTACT INFORMATION Silicon Laboratories Inc.
400 West Cesar Chavez
Austin, TX 78701 Tel: 1+(512) 416-8500 Fax: 1+(512) 416-9669 Toll Free: 1+(877) 444-3032 Email: PoEinfo@silabs.com Internet: www.silabs.com Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc. Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders. The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from the use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features or parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, rep- resentation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation conse- quential or incidental damages. Silicon Laboratories products are not designed, intended, or authorized for use in applications intended to support or sustain life, or for any other application in which the failure of the Silicon Laboratories product could create a situation where per- sonal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized ap- plication, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages.