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| 型号： | 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： | 11/34页 |
| 文件大小： | 558K |
| 代理商： | L6911ETR |
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L6911E
Device description
19/34
As shown in Figure 8 on page 18, the ESR drop is present in any case, but using the droop
function the total deviation of the output voltage is minimized. In practice the droop function
introduces a static error (Vdroop in Figure 8 on page 18) proportional to the output current.
Since a sense resistor is not present, the output DC current is measured by using the
intrinsic resistance of the inductance (a few m
). So the low-pass filtered inductor voltage
(that is the inductor current) is added to the feedback signal, implementing the droop
function in a simple way. Referring to the schematic in Figure 9, the static characteristic of
the closed loop system is:
Equation 13
Where VPROG is the output voltage of the digital to analog converter (i.e. the set point) and
RL is the inductance resistance. The second term of the equation allows a positive offset at
zero load (
V+); the third term introduces the droop effect (V
DROOP). Note that the droop
effect is equal the ESR drop if:
Equation 14
Figure 9.
Compensation network
V
OUT
V
PROG
V
PROG
R3
R8 // R9
+
R2
-------------------------------------
R
L
R8 // R9
R8
---------------------------------- I
OUT
–
+
=
R
L
R8 // R9
R8
----------------------------------
ESR
=
C1 8
C2 0
R 4
R3
R9
L2
ES R
C6 - 1 5
R8
R2
PW M
C2 5
V IN
V PRO G
R L
Z F
Z I
V OU T
V P H ASE
V CO M P
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