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DER-52

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DER-52 数据手册

DER-52

TNY263 Multi Output

April 20, 2005

4 Circuit Description

The schematic in Figure 2 shows an off-line flyback converter using the TNY263P. The

circuit is designed to operate from 85 VAC to 265 VAC input and provides multiple

outputs (i.e. +5V, +9V, +12V).

4.1 TinySwitch-II Primary

AC input power is rectified by a full bridge diodes, consisting of D1 through D4. The

rectified DC is then filtered by the bulk storage capacitors C12 and C1. Inductor L6, C1

and C12 form a pi (π) filter, which attenuates conducted differential-mode EMI noise.

The rectified DC rail is applied to one end of the transformer primary, the other end being

connected to the drain pin of the integrated MOSFET of U4.

To keep the peak DRAIN voltage acceptably below the BV_DSS(700V) of U4, diode D5,

C3, R8, and R2 form a primary clamp. This network clamps the voltage spike seen on

the DRAIN due to primary and secondary reflected leakage inductance.

Capacitor C4 stores energy through the internal high voltage device and provides bias

supply for U4.

4.2 Output Rectification

The secondary has three isolated windings. Each output is rectified and filtered to provide

+5V, +9V & +12V DC outputs. The +5V output has a post filter to reduce the high

frequency output voltage ripple.

4.3 Output Feedback

The regulation is realized with a TL431 shunt regulator to keep the 5V output tolerance

within the specification.

For a relaxed 5V tolerance the TL431 regulation circuit could be replaced with a Zener

diode regulation.

Power Integrations

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