ST1S14 datasheet(19/46 Pages) STMICROELECTRONICS

Part #	ST1S14

Description	Power good open collector output

PDF	46 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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DocID17977 Rev 2

19/46

ST1S14

Closing the loop

Equation 10

whereas the zero is defined as:

Equation 11

The embedded compensation network is RC=200 K, CP=24 pF, CC=211 pF and CO can be

considered negligible, so the singularities are:

Equation 12

6.3

Voltage divider

The contribution of a simple voltage divider is:

Equation 13

Figure 11. Leading network example

A small signal capacitor in parallel to the upper resistor (see Figure 11.) of the voltage

divider implements a leading network (fzero < fpole), sometimes necessary to improve the

system phase margin:

Equation 14

P HF

π R

()

⋅⋅

⋅

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

π R

⋅⋅

⋅

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

3 77 kHz

P LF

301 Hz

P HF

33 16 kHz

DIV s

()

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

ST1S14 Datasheet(PDF) 19 Page - STMicroelectronics