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SN6505B-Q1: Different between SN6505B-Q1 and LM5160-Q1

Jamie Tseng
Intellectual 2405 points
Part Number: SN6505B-Q1
Other Parts Discussed in Thread: LM5160-Q1, LM5160

Hi Team,

What’s the difference of output-regulation-performance between Flybuck and Push-pull ?

The use-case is CANbus module as below shows:

A simple comparison table between two devices , LM5160-Q1 and SN6505B-Q1, will be highly appreciated.

Thanks and best regards,

Jamie

  • 0
    TI__Mastermind 49545 points

    Hi Jamie,

    LM5160 doesn't come from the same product line as SN6505, hence, I won't be able to give you a detailed comparison table between the two devices. I will share you the major differences between the two devices to help you make a decision in selection.

    I think LM5160 Flybuck topology achieves secondary output regulation through primary output control and doesn't require a feedback from secondary output. This regulation maybe sufficient for many applications but for better secondary output regulation, you may need an isolated feedback network from secondary to primary. LM5160 transformer needs to be carefully designed to meet your output requirements.

    SN6505 is an open-loop push-pull transformer driver which has a fixed duty cycle and no feedback network. Based on the transformer turns-ratio, it generates a fixed output voltage and doesn't strictly regulate the output. Hence, the output voltage is expected to drop as the load increases as this is an open-loop device and there is no feedback network to regulate the output.
    Please note that SN6505 family is developed to offer a cost effective solution with minimal design requirement. The transformer design is fairly simple and the turns-ratio decides the output voltage. Off the shelf standard turns-ratio transformers will work just fine with SN6505 while a Flybuck would need a custom transformer for a given design. To regulate the output of SN6505 based solution, we recommend using an LDO as shown in the diagram you have shared. This makes the solution really cost effective and quick to design.

    For more information on LM5160, please do reach out to the DC/DC converters team. Thanks.

    Regards,
    Koteshwar Rao