ST1S14 datasheet(20/46 Pages) STMICROELECTRONICS

20 / 46 page

Closing the loop

ST1S14

20/46

DocID17977 Rev 2

where:

6.4

Total loop gain

In summary, the open loop gain can be expressed as:

Equation 15

Example: VIN = 12 V, VOUT = 3.3 V, ROUT = 2 Ω.

The resistor divider is R1=5.6 K, R2=3.3 K.

CR1=150 nF implements a leading network (fZ=190 kHz, fP=510 kHz).

Selecting L = 8.2 µH, COUT = 100 µF, and ESR = 75 mΩ, the gain and phase bode

diagrams are plotted respectively in Figure 12 and 13 over input voltage range (VIN=6

V to 48 V, IOUT=3 A).

Figure 12. Module plot

DIV s

()

--------------------

⋅⋅

()

⋅

---------------------

⋅⋅

⎝⎠

⎛⎞

-----------------------------------------------------------------

⋅

π R

⋅⋅

⋅

----------------------------------------------

⋅

---------------------

⋅⋅

⋅

-------------------------------------------------------------

()

DIV s

() G

CO s

() A

0 s

()

⋅⋅

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