UCC28220, UCC28221

SLUS544C − SEPTEMBER 2003 − REVISED OCTOBER 2007

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APPLICATION INFORMATION

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DEVICE

DESCRIPTION

PACKAGE OPTION

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References and Resources:

An evaluation module and an associated user’s guide are available. The UCC28221 is used in a two-channel

interleaved Forward design converting from 36-V to 76-V dc input voltage to a regulated 12-V dc output. The

power module has two isolated 100 W forward power stages operating at 500 kHz, which are operating 180

degrees out of phase with each other allowing for output current ripple cancellation and smaller magnetic

design. This design also takes advantage of the UCC28221’s on-board 110-V internal JFET start up circuit that

removes the need of an external trickle charge resistor for boot strapping. This circuit turns off after auxiliary

power is supplied to the device conserving power.