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参数资料
| 型号： | L6726ATR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 297 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 9/35页 |
| 文件大小： | 986K |
| 代理商： | L6726ATR |
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L6726A
Application details
Doc ID 12754 Rev 4
17/35
Type II compensation relies on the zero introduced by the output capacitors bank to achieve
stability. Thus, a needed condition to successfully apply type II compensation is
(usually true when output capacitor is based on electrolytic, aluminium electrolytic or
tantalum capacitor).
To define compensation network components values, the below suggestions may be
followed:
a)
Set the output resistor divider in order to obtain the desired output voltage:
Usual values of RFB and ROS ranges from some hundreds of Ω to some kΩ
(consider trade-off between power dissipation on output resistor divider and offset
introduced by FB bias current).
If the desired output voltage is equal to internal reference, ROS has to be NC and
FB pin can be directly connected to VOUT.
b)
Set RF in order to obtain the desired closed loop regulator bandwidth according to
the approximated formula:
If VOUT = VREF, just consider (RFB+ROS)/ROS factor equal to 1.
c)
Place FZ below FLC (typically 0.2FLC):
d)
Place FP at 0.5FSW:
e)
Check that compensation network gain is lower than open loop transconductance
EA gain.
f)
Estimate phase margin obtained (it should be greater than 45°) and repeat,
modifying parameters, if necessary.
F
ESR
F
0dB
<
R
FB
R
OS
-----------
V
OUT
V
REF
--------------
1
–
=
R
F
0dB
F
ESR
F
LC
2
-------------------------------
ΔV
OSC
V
IN
-------------------
1
gm
--------
R
FB
R
OS
+
R
OS
----------------------------
=
C
F
5
2
π R
F
LC
---------------------------------
=
C
P
C
F
π R
F
C
F
SW
1
–
----------------------------------------------------
1
π R
F
SW
-------------------------------
=
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