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L6911DTR Fiches technique(PDF) 11 Page - STMicroelectronics

No de pièce L6911DTR
Description  5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION
Download  17 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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L6911D
Figure 6. Output transient response without (a) and with (b) the droop function
As shown in figure 6, 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 6) propor-
tional 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
Ω). So the low-pass filtered inductor voltage (that is the induc-
tor current) is added to the feedback signal, implementing the droop function in a simple way. Referring to the
schematic in figure 7, the static characteristic of the closed loop system is:
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 (
∆VDROOP). Note that the droop effect is equal the ESR drop if:
Figure 7. Compensation network
Considering the previous relationships R2, R3, R8 and R9 may be determined in order to obtain the desired
droop effect as follow:
s
Choose a value for R2 in the range of hundreds of K
Ω to obtain realistic values for the other
components.
VMAX
VMIN
VNOM
(a)
(b)
ESR DROP
ESR DROP
VDROOP
V
OUT
V
PRO G
V
PRO G
R3
R 8 // 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 PR O G
R L
Z F
Z I
V OU T
V PH ASE
V CO M P


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