L6728D STMicroelectronics, L6728D Datasheet - Page 17
L6728D
Manufacturer Part Number
L6728D
Description
IC CTLR PWM 1PH POWERGOOD 10DFN
Manufacturer
STMicroelectronics
Datasheet
1.L6728DTR.pdf
(33 pages)
Specifications of L6728D
Pwm Type
Voltage Mode
Number Of Outputs
1
Frequency - Max
330kHz
Duty Cycle
80%
Voltage - Supply
5 V ~ 12 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
-40°C ~ 125°C
Package / Case
10-DFN
Frequency-max
330kHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
L6728D
Figure 6.
●
●
To place the poles and zeroes of the compensation network, the following suggestions can
be followed:
Open loop converter singularities:
a)
b)
Compensation network singularities frequencies:
a)
b)
c)
d)
a)
Set the gain R
according to the approximated formula (suggested values for R
of a few kΩ):
F
F
F
F
F
F
----------
R
R
LC
ESR
Z1
Z2
P1
P2
FB
F
Example of type III compensation
=
=
=
=
=
=
compensation
converter gain
loop gain
open loop
=
EA gain
closed
------------------------------
2π R
---------------------------------------------------- -
2π
------------------------------------------------- -
2π R
------------------------------ -
2π R
open loop
--------------------------------- -
2π L C
F
------------
F
------------------------------------------- -
2π C
gain
0dB
LC
⋅
⋅
⋅
⋅
(
⋅
1
R
Gain
1
[dB]
0dB
1
F
⋅
F
S
⋅
FB
ΔV
------------------ -
OUT
⋅
⋅
⋅
F
C
⎛
⎝
1
C
V
OUT
1
1
/R
+
-------------------- -
C
OSC
C
F
IN
S
R
F
FB
F
⋅
+
ESR
S
⋅
) C
C
C
in order to obtain the desired closed loop regulator bandwidth
Doc ID 16498 Rev 1
⋅
P
P
⎞
⎠
S
F
Z1
F
F
LC
Z2
F
F
ESR
P1
F
0dB
F
P2
20log (R
F
/R
20log (V
FB
Log (Freq)
)
IN
Application details
/ΔV
FB
OSC
are in the range
)
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