STEVAL-ISA026V1 STMicroelectronics, STEVAL-ISA026V1 Datasheet - Page 16

• Manufacturer Part Number: STEVAL-ISA026V1
• Description: EVAL BOARD 20A 250KHZ L6732
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of STEVAL-ISA026V1

• Design Resources: STEVAL-ISA026V1 Gerber Files STEVAL-ISA026V1 Schematic STEVAL-ISA026V1 Bill of Material
• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 3.3V
• Current - Output: 20A
• Voltage - Input: 4.5 ~ 14V
• Regulator Topology: Buck
• Frequency - Switching: 250kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L6732
• Input Voltage: 4.5 V to 14 V
• Output Voltage: 3.3 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: L6732
• Kit Application Type: Power Management - Voltage Regulator
• Rohs Compliant: No
• 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: L6732
• Other names: 497-5869

Device description
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Driver section
The high-side and low-side drivers allow using different types of power MOSFETs (also
multiple MOSFETs to reduce the R
The low-side driver is supplied by V
pin. A predictive dead time control avoids MOSFETs cross-conduction maintaining very
short dead time duration in the range of 20 ns. The control monitors the phase node in order
to sense the low-side body diode recirculation. If the phase node voltage is less than a
certain threshold (-350 mV typ.) during the dead time, it will be reduced in the next PWM
cycle. The predictive dead time control doesn't work when the high-side body diode is
conducting because the phase node doesn't go negative. This situation happens when the
converter is sinking current for example and, in this case, an adaptive dead time control
operates.
Monitoring and protections
The output voltage is monitored by means of pin FB. If it is not within ±10 % (typ.) of the
programmed value, the Power good (PGOOD) output is forced low.
The device provides over-voltage-protection: when the voltage sensed on FB pin reaches a
value 20% (typ.) greater than the reference, the low-side driver is turned on as long as the
over voltage is detected (see
Figure 10. OVP
It must be taken into account that there is an electrical network between the output terminal
and the FB pin and therefore the voltage at the pin is not a perfect replica of the output
voltage. However due to the fact that the converter can sink current, in the most of cases the
low-side will turn-on before the output voltage exceeds the over-voltage threshold, because
the error amplifier will throw off balance in advance. Even if the device doesn't report an
over-voltage, the behavior is the same, because the low-side is turned-on immediately. The
following figure shows the device behavior during an over-voltage event. The output voltage
Figure
DS(on)
CCDR
10.).
while the high-side driver is supplied by the BOOT
maintaining fast switching transitions.
LGate
FB
L6732