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Product(s)

- Obsolete

Product(s)

AN1645 - APPLICATION NOTE

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Figure 21d: Board Layout - Bottom Tracks

13. HOW TO USE THE BOARD

The demo board is meant to implement synchronous rectification in a Forward converter. If diodes are

mounted on the board, they must be removed. Connect the Demo Board as depicted in figure 22. If Vout

is equal or higher than 5V connect Vsupply to Vout (as in the figure). If Vout is lower than 5V, connect

Vsupply together with FW Drain. This last configuration is preferable because, even during short circuit

conditions, the device drives the two mosfets avoiding body diode conduction and consequently

excessive power dissipation.

Figure 22: Connecting the Board to a Forward Converter

Vin

Vout

TRANSFORMER

INDUCTOR

Cout

SCHOTTKY

SCHOTTKY

PWM

Feedback

Loop

FR Drain

Vsupply

SGLGND

PWRGND

FW Drain

Vin

Vout

TRANSFORMER

INDUCTOR

Cout

SCHOTTKY

SCHOTTKY

PWM

Feedback

Loop

FR Drain

Vsupply

SGLGND

PWRGND

FW Drain