UCC28750: PWM Controller recommendation

Hello,

My customer is looking for a PWM controller under the following conditions.

    - topology :  Isolated Flyback

    - VIN : DC 700~800V

    - VOUT : Use 4 to 5 values between DC 5V and 12V (ex 12V, 5V, etc.)

    - Power : 30~40W

    - External FET

    - They do not prefer products with small packages due to concerns about heat generation.

Could you please recommend a suitable product among TI products?

Thank you.

JH