STEVAL-ISA039V1 STMicroelectronics, STEVAL-ISA039V1 Datasheet - Page 16
![BOARD EVAL BASED ON L6727](/photos/9/14/91475/steval-isa039v1_sml.jpg)
STEVAL-ISA039V1
Manufacturer Part Number
STEVAL-ISA039V1
Description
BOARD EVAL BASED ON L6727
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Specifications of STEVAL-ISA039V1
Design Resources
STEVAL-ISA039V1 Gerber Files L6727 Eval Board Schematic STEVAL-ISA039V1 Bill of Materials
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
L6727
Input Voltage
5 V to 12 V
Output Voltage
1.25 V
Product
Power Management Modules
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
L6727
Other names
497-8266
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-ISA039V1
Manufacturer:
STMicroelectronics
Quantity:
1
Application details
16/34
Compensation goal is to close the control loop assuring high DC regulation accuracy, good
dynamic performances and stability. To achieve this, the overall loop needs high DC gain,
high bandwidth and good phase margin.
High DC gain is achieved giving an integrator shape to compensation network transfer
function. Loop bandwidth (F
stability, it should not exceed F
has to cross 0dB axis with -20 dB/decade slope.
As an example,
Figure 7.
●
●
Open loop converter singularities:
a)
b)
Compensation Network singularities frequencies:
a)
b)
c)
d)
F
F
F
F
F
F
ESR
Example of type III compensation.
LC
Z1
Z2
P1
P2
compensation
converter gain
loop gain
open loop
EA gain
=
Figure 7
closed
=
=
open loop
=
=
=
------------------------------
2π R
gain
--------------------------------- -
2π L C
---------------------------------------------------- -
2π
------------------------------------------------- -
2π R
------------------------------ -
2π R
------------------------------------------- -
2π C
⋅
Gain
[dB]
0dB
⋅
⋅
⋅
⋅
(
1
R
1
F
1
⋅
F
S
FB
shows an asymptotic bode plot of a type III compensation.
OUT
⋅
⋅
⋅
C
OUT
1
1
⎛
⎝
C
1
+
F
-------------------- -
C
0dB
C
S
⋅
R
F
F
ESR
SW
Doc ID 12933 Rev 4
+
S
⋅
) can be fixed choosing the right R
) C
C
C
⋅
/2π. To achieve a good phase margin, the control loop gain
P
P
⎞
⎠
F
Z1
S
F
F
LC
Z2
F
F
ESR
P1
F
0dB
F
P2
20log (R
F
/R
F
20log (V
/R
FB
Log (Freq)
)
FB
IN
ratio, however, for
/ΔV
OSC
)
L6727