Cirrus-logic AN374 Manual do Utilizador descarregar pdf (Página 11)

AN374

AN374REV2 11

Bit STRING in register Config3 at address 7 selects the second stage output channel configuration. When bit

STRING is set to ‘1’ a series configuration is selected. Figure 3 illustrates the process used to select the

second stage flyback mode using the CS163X system design application.

Step 2) Select power train topology

The CS1630/31 supports three possible power train configurations: tapped buck, buck, and flyback (see

Figure 4a, 4b, and 4c). The two most important factors for selecting a power train configuration is whether the

output requires Underwriters Laboratory (UL) approved isolation and the input to output voltage ratio. The

flyback power train can be either isolated or non-isolated. Buck and tapped-buck designs are expected to

always be non-isolated. If isolation is not required, one of the three possible solutions must be selected. If

isolation is required, the design will be a flyback.

Step 2a:

Select Series

vs. Parallel

Step 2b:

Select Flyback,

Buck, or

Tapped Buck

Figure 3. Second Stage String Configuration

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 34 35

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Cirrus-logic AN374 Manual do Utilizador Página 11