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参数资料
| 型号： | E-L6911ETR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | SO-20 |
| 文件页数： | 13/35页 |
| 文件大小： | 563K |
| 代理商： | E-L6911ETR |
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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
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
V
DROOP
R
L
I
MAX
--------------------------
+
------------------------------------
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