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AN611 Datasheet(PDF) 6 Page - Silicon Laboratories

Part No. AN611
Description  USING THE ISOVOLT DC/DC CONVERTER REFERENCE DESIGN
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Maker  SILABS [Silicon Laboratories]
Homepage  http://www.silabs.com
Logo SILABS - Silicon Laboratories

AN611 Datasheet(HTML) 6 Page - Silicon Laboratories

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AN611
6
Rev. 0.2
2. Adjusting Converter Performance
The gate driver used in this reference design is a general-purpose driver that can be used to drive any high- and
low-side drive with the proper selection of components. The selection of the bootstrap capacitor and resistor is
important (see "1.1. Gate Driver Circuits" on page 2 for details). Increasing the gate drive current requires higher
current drive transistors (e.g. Q1 and Q2 in Figure 2).
2.1. Changing Output Voltage
The dc-dc converter can be adapted for different output voltages by modifying the turns-ratio of the isolation
transformer. The secondary rectifiers (diodes D1 and D2 shown in Figure 1) should be rated for at least twice the
maximum clamped voltage at the input to the linear regulator. In practice, it is recommended to use at least 50%
overhead above this value to accommodate the voltage spikes due to circuit parasitics. The output filter capacitor
should also be rated according to the maximum output voltage generated.


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