UCC2808A-1: UCC2808A Wide Input Range

Hirotsugu Kobayashi

Replies: 5

Views: 699

Part Number: UCC2808A-1

Is it possible to achieve a circuit of Fig.2 of ucc2808 data seat?
The input voltage area which is 72V from 36V by Push - Pull system, can it correspond?

Expert 7055 points

John Stevens
- Dec 28, 2016 3:22 AM
Kobayashi-San,
Thank you for your interest here. Please excuse the delays until January 3rd as it is US holiday now.
Figure 2 if the data sheet seems to be a curve for Idd vs. Osc frequency. What circuit figure are you referring to? Your design needs input voltage range from 36-72v , is that correct? What is your output voltage and current?
Regards
John
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Hirotsugu Kobayashi
- Dec 28, 2016 3:47 AM
In reply to John Stevens:

John-san

I'm seeing rebesion SLUS456D of a dataseat.

The circuit which is being asked is attached.

Best Regards,
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John Griffin1
- Jan 3, 2017 2:20 PM
In reply to Hirotsugu Kobayashi:

Hi Kobayashi-san,
The data sheet for this part has recently been revised. The latest revision is now SLUS456E.
The application section is now shown in Fig. 11.
The input voltage varies from 36V to 72V and has a nominal value of 48V.
The output is 5V at 50W max.
This application is detailed as a design example and is not available as a reference design.

Regards,
John Griffin
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Hirotsugu Kobayashi
- Jan 4, 2017 6:42 AM
In reply to John Griffin1:

Hi John
It's mentioned that the input voltage range is from 36V to 72V by a design parameter of Table.2 of a data seat.
But our costomer think it's difficult to correspond to a wide input voltage range with Push-pull topology.

Can UCC2808A correspond to a double input voltage range?

Best Regards,
Kobayashi
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John Griffin1
- Jan 4, 2017 10:12 AM
In reply to Hirotsugu Kobayashi:

Hi Kobayashi-san,

The push pull can be designed for this wide voltage range.

For example if the output duty cycle is 90% at 36V (corresponding to 45% duty cycle on each gate drive) then the required output duty cycle will be 45% at 72V
(corresponding to 22.5% duty cycle on each gate drive)
Does that make sense? Of course it is always difficult to design a power supply with a wide input range but it is possible to do so with the right care and attention to details

Regards,

John
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UCC2808A-1: UCC2808A Wide Input Range

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