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PMP11303: Can you give me the better comparative material?

Part Number: PMP11303
Other Parts Discussed in Thread: UCC29950, UCC27517, , PMP

Hi member.
I'm proposing UCC29950+UCC27517 to business use printer made by MELCO, now.
Demand Quantity(About):1ku / Month

My customer say it want to downsize the board area.

Therefore, compared The past TI's forward type device and Circuit configuration of UCC29950,I want to appeal that become smaller.
※Appeal's example:The heat sink has become smaller because to improved efficiency.
※The current model uses M51977(made of Renesas) by Forward type circuit.
※Since we are proposing using the document of PMP11303, I want to appeal with 300W class power supply specification substrate area.
※Since the customer's output specification is 400 W, I wnat to appeal "it can relativing about what percentage".

Next model requirement specification
Input Voltage:100~240V@AV(MIN / MAX:85V / 264V)
Output Voltage:30~40V@DC(検討中)
Output power:400W

So, could you give me a document that understands the mounting area of past forward devices?

Could you help us?

Best Regards,