EVAL5985 STMicroelectronics, EVAL5985 Datasheet - Page 18
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EVAL5985
Manufacturer Part Number
EVAL5985
Description
BOARD EVAL FOR L5985
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Specifications of EVAL5985
Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
3.3V
Current - Output
2A
Voltage - Input
3.3 ~ 18V
Regulator Topology
Buck
Frequency - Switching
500kHz
Board Type
Fully Populated
Utilized Ic / Part
L5985
Input Voltage
2.9 V to 18 V
Output Voltage
0.6 V to 16 V
Product
Power Management Modules
Silicon Manufacturer
ST Micro
Silicon Core Number
L5985
Kit Application Type
Power Management - Voltage Regulator
Application Sub Type
Step Down Switching Regulator
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
L5985
Other names
497-6387
EVAL5985
EVAL5985
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Application information
18/37
The transfer function on the LC filter is given by:
Equation 13
where:
Equation 14
Equation 15
As seen in
following paragraph the guidelines to select the Type II and Type III compensation network
are illustrated.
Figure 9.
V
V
FB
FB
REF
REF
Chapter 4.3
Error amplifier, PWM modulator and LC output filter
E/A
E/A
f
Q
LC
=
=
----------------------------------------------------------------------------------------- -
----------------------------------------------------------------------- -
2π
V
V
two different kind of network can compensate the loop. In the two
R
S
S
COMP
COMP
OUT
⋅
L
L C
G
+
⋅
⋅
LC
L C
C
Doc ID 13006 Rev 5
OUT
⋅
s ( )
OUT
G
G
1
PW0
PW0
OUT
=
⋅
⋅
R
------------------------------------------------------------------------ -
1
OUT
PWM
PWM
1
⋅
+
(
+
R
----------------------------
2π Q f ⋅
-------------- -
R
OUT
ESR
⋅
OUT
E SR
1
⋅
s
+
+
,
------------------------- -
2π f
ESR
LC
⋅
f
s
+
zESR
zESR
)
⎛
⎝
,
------------------ -
2π f
V
V
CC
CC
s
=
⋅
OUT
OUT
LC
------------------------------------------- -
2π ESR C
R
⎞
⎠
OUT
⋅
2
G
G
1
=
LC
LC
⋅
V
--------------
I
L
L
OUT
OUT
OUT
ESR
ESR
C
C
OUT
OUT
L5985