关于SN6501应用问题

请问可以用SN6501设计出5V输入/5V输出 300ma电流   副边带LDO稳压输出电源吗？请推荐伍尔特变压器型号和稳压LDO型号，或者电路设计参考？

Fery Feng：

你好，

该应用是可以满足的，可以考虑使用金升阳模块。LDO可以参考我们的TLV702系列，或者直接在www.ti.com.cn上面找合适的LDO。

Johnsin Tao：

回复 Fery Feng:

Hi初级开关电流在5V输入时最大是350mA, 输出要做到300mA有困难吧，按照datasheet上示意图，建议在100mA输出。

Robin Liu：

您好！以下是来自产品线的答复，谢谢！

1) For the desired specs,  especially the 300mA load, the SN6501 will be too tight, since it's max current capability @ 5V is only 350mA.  Since we need to use a step-up transformer to account for drops across diodes and the LDO,  we need more margin in the spec.  For this reason, I'd recommend the SN6505 solution. It can provide up to 1A and therefore is an excellent solution.

2) For the transformer, do you know if you need basic isolation or reinforced isolation? For Basic Isolation (2.5-kVrms)  you can use the following transformer from Wuerth : 750315371 and for reinforced (5 Kvrms)  you can refer to 750315240, also by the same  company. These are for examples only. You/your customer can pick a similar spec transformer from their preferred vendor.

3) For the LDO, you can use a TI TPS76350 or TPS76701QD, or some other TI LDO with similar specs.

For convenience, the SN6505 EVM  and User Guide for the above solution (including schematics and full BOM) is available here: 

Table 3 in the SN6505 Datasheet is also a good source for transformer part numbers (Page 24).