UC3846 or UC3856 design

ricardourio · 8th December 2008, 03:58 PM

Somebody have a schematic of a power supply using UC3846 or UC3856 with half-bridge topology? I want to make a SMPS with 32V / 25Ah with it.

Thnks

mflorin · 8th December 2008, 09:13 PM

Just a though...

Half bridge current mode control is usually avoided due to the 'equivalent' series capacitor seen in series with transformer primary winding. This tends to make your system unstable.
If half bridge is the topology you want to go, then you better consider a voltage mode control.

ricardourio · 8th December 2008, 11:06 PM

Thanks mflorin. Whats topology that you indicate to a 32V/25A SMPS ? And for Voltage mode, whats PWM IC you indicate ?

mflorin · 12th December 2008, 07:15 PM

you have to give more design data for your 800W SMPS...

sonegatti · 18th December 2008, 02:30 AM

Hello Brazilian Brother, take a look at this thread: Offline full-bridge SMPS....need help

U may find a lot of stuff and references for your SMPS.

8th December 2008, 03:58 PM	#1
ricardourio diyAudio Member Join Date: Jul 2008	UC3846 or UC3856 design Somebody have a schematic of a power supply using UC3846 or UC3856 with half-bridge topology? I want to make a SMPS with 32V / 25Ah with it. Thnks

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8th December 2008, 09:13 PM	#2
mflorin diyAudio Member Join Date: Jun 2005 Location: IASI	Just a though... Half bridge current mode control is usually avoided due to the 'equivalent' series capacitor seen in series with transformer primary winding. This tends to make your system unstable. If half bridge is the topology you want to go, then you better consider a voltage mode control.

8th December 2008, 11:06 PM	#3
ricardourio diyAudio Member Join Date: Jul 2008	Thanks mflorin. Whats topology that you indicate to a 32V/25A SMPS ? And for Voltage mode, whats PWM IC you indicate ?

12th December 2008, 07:15 PM	#4
mflorin diyAudio Member Join Date: Jun 2005 Location: IASI	you have to give more design data for your 800W SMPS...

18th December 2008, 02:30 AM	#5
sonegatti diyAudio Member Join Date: Jun 2006	Hello Brazilian Brother, take a look at this thread: Offline full-bridge SMPS....need help U may find a lot of stuff and references for your SMPS.

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