STEVAL-ISV009V1 STMicroelectronics, STEVAL-ISV009V1 Datasheet - Page 35

• 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

AN3392
13.9
Note:
Maximum voltage of this capacitor is strictly dependent by the output voltage range.
SPV1020 can support up to 40 V so, suggested maximum voltage for these capacitors is 50
V, or higher.
Low-ESR capacitors are good choices to increase the whole system efficiency.
Suggested minimum output capacitance is 16 μF.
In order to reduce the ESR effect it is suggested split output capacitance into 3 capacitors
placed in parallel.
According with the maximum current (Isc) provided by the PV panel connected at the input,
following formula can be used in order to select the proper capacitance value (Cout) for a
specified maximum output voltage ripple (Vout_rp_max):
It is suggested to split the capacitance in 4 capacitors, each one to be connected to each of
the 4 Vout pins of the SPV1020. This will help in order to balance the impedance of the 4
tracks.
Output voltage partitioning
R3 and R4 are the 2 resistors used for partitioning the output voltage.
Said VOUT_MAX the maximum output voltage of the load, the R3 and R4 must be selected
according to the following rule:
Also, in order to optimize the efficiency of the whole system, when selecting R3 and R4,
their power dissipation has to be taken into account.
Assuming negligible the current flowing through pin Vout_sns, maximum power dissipation
on the series R3+R4 is:
As empiric rule, R3 and R4 should be selected according to:
In order to guarantee the proper functionality of pin V
R3+R4 should be in the range between 20 µA and 200 µA.
P
Doc ID XXXXX Rev 1
vout
Cout ≥
_
P
sn s
vout
R
R
<<
3
4
Isc
_
1
=
sns
%(
*
V
=
Vout
out
V
. 1
(
ou t
00
V
R
Fsw
_
out
max
_
3
_
m ax
+
rp
_
−
max
R
∗
out_sns
_
1
4
I
max
)
o ut
2
_
External component selection
max
current flowing on the series
)
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