STEVAL-ISV009V1 STMicroelectronics, STEVAL-ISV009V1 Datasheet - Page 32

• Manufacturer Part Number: STEVAL-ISV009V1
• Description: Power Management Modules & Development Tools DUAL STG DC/AC CNVRT DEMO BRD
• Manufacturer: STMicroelectronics
• Series: -r

Specifications of STEVAL-ISV009V1

• Design Resources: STEVAL-ISV009V1 BOM STEVAL-ISV009V1 Schematic
• Main Purpose: DC/DC, Step Up
• Outputs And Type: 1, Non-Isolated
• Power - Output: -
• Voltage - Output: 36V
• Current - Output: -
• Voltage - Input: -
• Regulator Topology: Boost
• Frequency - Switching: -
• Board Type: Fully Populated
• Utilized Ic / Part: SPV1020
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

External component selection
13.3
32/52
Considering the maximum duty cycle (90%):
Taking into account the overcurrent threshold (4.5 A):
Finally, inductance should be chosen according to the following formula:
A safer choice should replace Vmp by Voc of the panel.
Usually, inductances ranging between 22 μH to 100 μH satisfy most application
requirements.
Critical parameters for the inductor choice are inductance (analyzed above), Irms, saturation
current and size.
Irms is a quite important parameter because causes the self rising temperature of the
inductor, affecting the nominal inductance value. So above constraint (I
be violated.
At the same size, small inductance value inductors guarantee both faster response to load
transients and higher efficiency.
Inductor size also affects the maximum current deliverable to the load. In any case, the
saturation current of the choke should be higher than the peak current limit of the input
source. So, suggested saturation current should be > 4.5A.
Inductors with low series resistance are suggested to guarantee high efficiency.
Boost capacitors
C1, C2, C3 and C4 are four capacitors used to guarantee SPV1020 internal functionality.
Their role is to maintain the required voltage level on pins CB1, CB2, CB3 and CB4 even
during the charging phase of the inductors.
Capacitance value is the same for all of the 4 capacitors and is not application dependant.
Suggested value is in the range of 22 nF to 100 nF.
Each capacitor switches synchronously to the related inductor, so at 100 kHz while
maximum voltage is fixed by the internal voltage regulator (~5V).
Low-ESR capacitors are good choices to increase the whole system efficiency.
L
X
I
>
Lx
Doc ID XXXXX Rev 1
(
1
2
pk
*
4
)
5 .
≅
V
−
I
I
mp
Lx
Lx
I
(
*
Lx
pk
(
9
rms
(
μ
)
rms
<
s
)
4
+
5 .
)
=
A
1
2
*
1
2
V
*
Lx
mp
V
4
m p
5 .
*
9
−
*
μ
9
I
s
μ
4
mp
s
LX
(pk)<4.5 A) could
AN3392