UC2845: Cost effective controller to generate 50% duty 300K to 500K output

Sheldon He

Expert 8585 points

Part Number: UC2845
Other Parts Discussed in Thread: UCC2800, UCC28700, TL2845,

Hi expert,

Do we have any cost effective part that can output 50% duty signal with good part to part slew and upto 500K?

Customer need this kind of controller to designing aux power supply.

Thanks

Sheldon

over 5 years ago

0 Peter Meaney over 5 years ago

TI__Mastermind 31580 points

Hi Sheldon,

TI has many cost effective PWM controllers that can output 50% duty cycle, UCC28C4x family, UCC281x, UCC2800 .

Can you clarify what you mean by part to part slew rate?

Regards

Peter

0 Sheldon He over 5 years ago in reply to Peter Meaney

TI__Expert 8585 points

Hi Peter,

They'd like to duty cycle and output frequency are less infected by device they are using and the small variation of external components.

Thanks

Sheldon

0 Peter Meaney over 5 years ago in reply to Sheldon He

TI__Mastermind 31580 points

Hi Sheldon,

What is their application and power supply toplogy ?

If they are using flyback then UCC28700 PSR flyback controllers may be a way of reducing component count.

Regards

Peter

0 Sheldon He over 5 years ago in reply to Peter Meaney

TI__Expert 8585 points

Hi Peter,

They implement like below:

Now, they like to know if they can replace UC2845 with tl2845 directly here? By changing RC, they'd like to output PWM at 500K, will that be okay?

Thanks

Sheldon

0 Sheldon He over 5 years ago in reply to Peter Meaney

TI__Expert 8585 points

Hi Peter,

Any updates on your side?

Thanks

0 Peter Meaney over 5 years ago in reply to Sheldon He

TI__Mastermind 31580 points

Hi Sheldon

The TL2845 should work in place of the UC2845.

Regards

Peter

Power management

Power management forum

UC2845: Cost effective controller to generate 50% duty 300K to 500K output