STEVAL-ISF002V1 STMicroelectronics, STEVAL-ISF002V1 Datasheet - Page 12

• Manufacturer Part Number: STEVAL-ISF002V1
• Description: BOARD EVALUATION
• Manufacturer: STMicroelectronics

Specifications of STEVAL-ISF002V1

• Main Purpose: *
• Embedded: *
• Utilized Ic / Part: *
• Primary Attributes: *
• Secondary Attributes: *
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-10422

STEVAL-ISF002V1 hardware description
3.3
3.3.1
3.3.2
3.3.3
12/62
Dimensioning the power components
This section describes how to dimension the power components relating to the power
section shown in
Preliminary definition
Based on the electrical characteristics listed in
are calculated.
Equation 1
Equation 2
Equation 3
Rectifier
The following equation is a calculation of the power rate for the bridge rectifier.
Equation 4
Input capacitor
A ripple of 20% has been chosen for the inductor current I
ripple is 6%.
Therefore:
Equation 5
Equation 6
Equation 7
This capacitor has to be in class X2 so its value must be 0.22 µF.
Figure 5
C
V
in
I
in(ripple)
in(rms)
P
=
Bridge
8
⋅
and the electrical characteristics shown in
=
f
sw
=
⋅ η
=
I
. 0
ripple
⋅
Doc ID 16854 Rev 1
2
V
06
V
I
in(avg)
⋅
I
in(ripple)
in(min)
in(pk)
V
I
P
ripple
⋅
F
out
V
⋅
in(pk)
I
in(avg)
=
=
⋅
=
PF
I
=
2
in(rms)
0
max
⋅
2 .
8
I
=
in(pk)
=
⋅
=
⋅
80
I
. 0
π
(
in(pk)
⋅
2
(
. 0
95
Section
⋅
⋅
⋅
10
2
06
. 2
0
8 .
⋅
1400
2
28
=
=
185
3
⋅
11
⋅
265
. 2
=
⋅
. 7
22
28
. 7
.
⋅
24
38
3.1, the following maximum values
. 0
.
24
⋅
49
A
)
99
A
W
L
2
A
μF
and it is assumed that the Vin
)
A
=
V
11
=
=
=
. 0
. 8
22
6 .
158
05
.
W
49
Section
A
μF
V
3.1.
UM0877