L6728H STMicroelectronics, L6728H Datasheet - Page 16
L6728H
Manufacturer Part Number
L6728H
Description
Voltage Mode PWM Controllers Sgl Output 300 KHz DFN-10
Manufacturer
STMicroelectronics
Datasheet
1.L6728H.pdf
(32 pages)
Specifications of L6728H
Number Of Outputs
Single Output
Switching Frequency
300 KHz
Operating Supply Voltage
5 V to 12 V
Supply Current
6 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Package / Case
DFN-10
Mounting Style
SMD/SMT
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Application details
16/32
Figure 6.
●
●
To place the poles and zeroes of the compensation network, the following suggestions may
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 some 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
open loop
loop gain
=
EA gain
closed
------------------------------
2π R
---------------------------------------------------- -
2π
open loop
--------------------------------- -
2π L C
------------------------------------------------- -
2π R
------------------------------ -
2π R
F
------------
F
------------------------------------------- -
2π C
gain
0dB
LC
⋅
⋅
⋅
⋅
(
⋅
1
R
Gain
1
[dB]
0dB
F
⋅
1
F
S
⋅
FB
ΔV
------------------ -
OUT
⋅
⋅
⋅
F
C
1
⎛
⎝
C
V
OUT
1
1
/R
+
-------------------- -
C
C
OSC
F
IN
S
F
R
FB
F
⋅
+
ESR
S
⋅
) C
C
C
in order to obtain the desired closed loop regulator bandwidth
Doc ID 15725 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
/ΔV
FB
OSC
are in the range
)
L6728H