STEVAL-ISV009V1 STMicroelectronics, STEVAL-ISV009V1 Datasheet - Page 23

• 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
10
10.1
10.2
10.3
Voltage regulation
In order to protect both the device itself and the load, SPV1020 implements a dual control
on the output voltage (Vout).
Control on Vout is done through Vout_sns pin, connected to Vout by a resistive partitioning
(see
consists of comparing Vout_sns with the 2 internal thresholds:
1.00V, for Voltage Regulation and
1.04V, for Over-Voltage Protection
When V
output voltage. Limitation consists generating an upper limit for the DC generated by the
MPPT algorithm.
The stability of the loop must be externally regulated connecting a resistor and a capacitor
(pole-zero compensation) between the PZ_OUT pin and SGND pin (see
resistances values).
Overvoltage protection
If the Vout_sns exceeds 1.04V a fault signal is generated and transmitted to the fault
controller which stops the drivers and produces a fault, setting the bit OVV in the status
register. This information is accessible through SPI interface by Read Status command (op
code 0x07). When VOUT_SNS falls down to 1.04 V the DC-DC switched ON again and the
converter restarts the MPP research from the minimum duty cycle (5%).
Overcurrent protection
To guarantee the safety of the whole application, SPV1020 implements an over current
protection on the low side power switches. Indeed, when Lx is accidentally shorted to VIN or
VOUT or when the current flowing through the inductor exceed the peak current limit (4.5A),
the related low side power switch is immediately turned OFF and the linked synchronous
rectifier is enabled to turn ON. The low side power switch is turned ON again at the next
PWM cycle.
In case of overcurrent on branch x [x = 1..4] the related OVC bit of the status register is set.
This information is accessible through SPI interface by Read Status command (op code
0x07).
Currents balance
Different parasitic resistance between the 4 branches of the IL-4 architecture can be the root
cause of a unbalanced current flow between the 4 branches. This event should be avoided
because could imply lower efficiency or damages on the application components (such as
the inductors) and/or on the SPV1020 itself.
A general recommendation is realizing a PCB layout with symmetric paths on the 4
branches and using high matching inductors of the same production lot.
Chapter 13: External component selection on page 30
OUT_SNS
increases up to 1V the output feedback loop enters regulation, limiting the
Doc ID XXXXX Rev 1
for resistances values). Control
Voltage regulation
Chapter 13
for
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