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L6911E Datasheet(PDF) 20 Page - STMicroelectronics

Part # L6911E
Description  5-Bit programmable step down controller with synchronous rectification
PDF  34 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6911E Datasheet(HTML) 20 Page - STMicroelectronics

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Device description
L6911E
20/34
Considering the previous relationships R2, R3, R8 and R9 may be determined in order to
obtain the desired droop effect as follow:
●
Choose a value for R2 in the range of hundreds of K
Ω to obtain realistic values for the
other components.
●
From the above equations, it results:
Equation 15
Equation 16
Where IMAX is the maximum output current.
●
The component R3 must be chosen in order to obtain R3 << R8//R9 to permit these
and successive simplifications.
Therefore, with the droop function the output voltage decreases as the load current
increases, so the DC output impedance is equal to a resistance ROUT. It is easy to verify that
the output voltage deviation under load transient is minimum when the output impedance is
constant with frequency.
R8
∆V
+
R2
⋅
V
PROG
-----------------------
R
L
I
MAX
⋅
V
DROOP
∆
--------------------------
⋅
=
R9
R8
=
V
DROOP
∆
R
L
I
MAX
⋅
--------------------------
1
1
V
DROOP
∆
R
L
I
MAX
⋅
--------------------------
+
------------------------------------
⋅⋅



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