STEVAL-ISA038V1 STMicroelectronics, STEVAL-ISA038V1 Datasheet - Page 12

• Manufacturer Part Number: STEVAL-ISA038V1
• Description: BOARD EVALUATION W/L6728
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of STEVAL-ISA038V1

• Design Resources: STEVAL-ISA038V1 Schematic STEVAL-ISA038V1 Bill of Material
• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.25V
• Current - Output: 5A
• Voltage - Input: 5 ~ 12V
• Regulator Topology: Buck
• Frequency - Switching: 300kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L6728
• Input Voltage: 5 V to 12 V
• Output Voltage: 1.25 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: L6728D
• Kit Application Type: Power Management - Voltage Regulator
• Application Sub Type: Step Down DC/DC Controller
• Kit Contents: Board
• 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: L6728
• Other names: 497-8228; STEVAL-ISA038V1

Over current protection
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Over current protection
The over current function protects the converter from a shorted output or overload, by
sensing the output current information across the low side MOSFET drain-source on-
resistance, R
avoiding the use of expensive and space-consuming sense resistors.
The low side R
node when LS MOSFET is turned on with the programmed OCP thresholds voltages,
internally held. If the monitored voltage is bigger than these thresholds, an over current
event is detected.
For maximum safety and load protection, L6728 implements a dual level over current
protection system:
●
●
When over current protection is triggered, the device turns off both LS and HS MOSFETs in
a latched condition.
To recover from over current protection triggered condition, VCC power supply must be
cycled.
1
PHASE exceeds this threshold, a 1
events are detected in four consecutive switching cycles, over current protection will be
triggered.
2
threshold multiplied by a factor 1.5. If the monitored voltage on PHASE exceeds this
threshold, over current protection will be triggered immediately.
st
nd
level threshold: it is the user externally set threshold. If the monitored voltage on
level threshold: it is an internal threshold whose value is equal to 1
DS(on)
DS(on)
. This method reduces cost and enhances converter efficiency by
current sense is implemented by comparing the voltage at the PHASE
st
level over current is detected. If four 1
st
level
st
level OC
L6728