UCD8220: Using UCD8220 without feedback

I need a recommendation for a simpler IC like LM5030 but that can work with low switching frequency 36 KHz and at the same time that contain internal regulator for it's VCC so I use the VIN voltage to the converter

someone on this forum suggested UCCx808-x but it's only supplied with VCC up to 15V.

Do you have any recommendations ?

I am designing a push pull converter with input range of 40-55V and output range of 300-440Vdc , switching frequency of 36 Khz and only interested in openloop configuration but at the same time I Will be controlling the duty cycle without feed back so that I can control the output range.

Hi Hong ,

Thank you for the speedy reply

ok firstly , are there any pspice or TINA models for any of the UCC2808-x family?

secondly , my Input voltage could reach 60V , i guess I should use a Buck converter IC to step down the voltage to bias the IC but if there are any alternatives that won't require such external biasing it would be much better for me

Thank you very much in advance.

it's written in the data sheet that the minium frequency is 175 Khz will it work at 36 KHz?

sorry for the too many questions but I am trying also to simulate LM5030 on pspice for ti since it's the nearest IC I 've found untill this moment in order to get a solid knowledge of the pin functionalities , here is a photo for the schematic and also the signal on the comp pin , I amnot getting any outputs of out1 or out 2 

I know but I am just getting to know the features.

The 20k resistor on RT should set the oscillator frequency for 265KHz but still thevoltage on the comp pin isn't around 5V as supposed to be and no out1 or out2 , Also what's the nearest pspice model available that is near the UCC2808-x family?

ok while designing the UCC2808-x PCB , I don't need current sensing function , can i use comp to control the Duty cycle of the PWM signal without feedback through directly giving it voltage within the range 0 to 5V ?