STEVAL-ISA026V1 STMicroelectronics, STEVAL-ISA026V1 Datasheet - Page 17

• 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

L6732
rises with a slope of 100 mV/µs, emulating in this way the breaking of the high-side
MOSFET as an over-voltage cause.
Figure 11. OVP: the low-side MOSFET is turned-on in advance
The device realizes the over-current-protection (OCP) sensing the current both on the
high-side MOSFET(s) and the low-side MOSFET(s) and so 2 current limit thresholds can be
set (see OCH pin and OCL pin in
The peak current protection is active when the high-side MOSFET(s) is turned on, after a
masking time of about 100 ns. The valley-current-protection is enabled when the low-side
MOSFET(s) is turned on after a masking time of about 400 ns. If, when the soft-start phase
is completed, an over current event occurs during the on time (peak-current-protection) or
during the off time (valley-current-protection) the device enters in HICCUP mode: the high-
side and low-side MOSFET(s) are turned off, the soft-start capacitor is discharged with a
constant current of 10 µA and when the voltage at the SS pin reaches 0.5 V the soft-start
phase restarts. During the soft-start phase the OCP provides a constant-current-protection.
If during the T
immediately turned off (after the masking time and the internal delay) and returned on at the
next PWM cycle. The limit of this protection is that the T
plus propagation delay because during the masking time the peak-current-protection is
disabled. In case of very hard short circuit, even with this short T
escalate. The valley-current-protection is very helpful in this case to limit the current. If
during the off-time the OCL comparator triggers an over current, the high-side MOSFET(s)
is not turned on until the current is over the valley-current-limit. This implies that, if it is
necessary, some pulses of the high-side MOSFET(s) will be skipped, guaranteeing a
maximum current due to the following formula:
●
●
ON
Peak current limit
Valley current limit
the OCH comparator triggers an over current the high-side MOSFET(s) is
Table 4.
Pins function):
109%
ON
can't be less than masking time
ON
, the current could
Device description
V
V
LGate
OUT
FB
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