STEVAL-ISA038V1 STMicroelectronics, STEVAL-ISA038V1 Datasheet - Page 16

• Manufacturer Part Number: STEVAL-ISA038V1
• Description: BOARD EVALUATION W/L6728
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of STEVAL-ISA038V1

• Design Resources: STEVAL-ISA038V1 Schematic STEVAL-ISA038V1 Bill of Material
• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.25V
• Current - Output: 5A
• Voltage - Input: 5 ~ 12V
• Regulator Topology: Buck
• Frequency - Switching: 300kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L6728
• Input Voltage: 5 V to 12 V
• Output Voltage: 1.25 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: L6728D
• Kit Application Type: Power Management - Voltage Regulator
• Application Sub Type: Step Down DC/DC Controller
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: L6728
• Other names: 497-8228; STEVAL-ISA038V1

Application details
16/31
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
⋅
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
)
L6728