AN892 Datasheet, PDF (1/16 Pages) Silicon Laboratories – DESIGN GUIDE FOR ISOLATED DC/DC USING THE

AN892
DESIGN GUIDE FOR ISOLATED DC/DC USING THE
SI882XX/883XX
1. Introduction
The Si882xx/Si883xx products have integrated digital isolator channels with an isolated dc-dc controller. This
application note provides guidance for selecting external components necessary for the operation of the dc-dc
controller.
Digital isolation applications with primary side supply voltage 3.0 V  V_IN  5.5 V and load power requirements of
≤ 2 W can use Si882xx/Si883xx products. These products’ dc-dc controller uses the asymmetric half bridge
flyback circuit topology.
Figure 1 shows the minimum external components required for the asymmetric half bridge flyback. They are a
blocking capacitor C1, input capacitor C2, flyback transformer T1, diode D1, output capacitor C10, voltage sense
resistors R5 and R6, and compensation network components R7 and C11.
Figure 1. Minimum Required External Components
Rev. 0.1 4/15
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AN892