STEVAL-ISA043V2 STMicroelectronics, STEVAL-ISA043V2 Datasheet - Page 7

• Manufacturer Part Number: STEVAL-ISA043V2
• Description: BOARD EVAL BASED ON ST1S06
• Manufacturer: STMicroelectronics

Specifications of STEVAL-ISA043V2

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 3.3V
• Current - Output: 1.5A
• Voltage - Input: 2.7 ~ 6V
• Regulator Topology: Buck
• Frequency - Switching: 1.5MHz
• Board Type: Fully Populated
• Utilized Ic / Part: ST1S06
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: ST1S06PUR
• Kit Application Type: Power Management - Voltage Regulator
• Application Sub Type: Synchronous Buck Converter
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-6420; STEVAL-ISA043V2

AN2371
3
Short-circuit protection
In Over-current Protection mode, when the peak current reaches the current limit, the device
reduces the t
and, in most of the applications, this is enough to limit the current to I
In any event, in case of a heavy short-circuit at the output (V
application conditions (V
peak could reach values higher than I
current ripple during the ON and OFF phases:
●
Equation 14
●
Equation 15
Where V
of the inductor. In short-circuit conditions, V
applied to the inductor is very small and it can be that the current ripple in this phase does
not compensate for the current ripple during the t
easily measured through the inductor with V
In case the application has to sustain the short-circuit condition for a long time, the external
components (mainly inductor and diode) must be selected based on this value.
ON phase
OFF phase
D
is the voltage drop across the internal NDMOS and DCRL is the series resistance
ON
to its minimum value. In these conditions, the duty cycle is strongly reduced
cc
value and parasitic effect of external components), the current
∆
∆
I
I
L
L
=
=
(
---------------------------------------------------------------- -
(
------------------------------------------------------------------ -
V
V
D
IN
LIM
+
–
V
V
. This can be understood considering the inductor
OUT
OUT
OUT
OUT
L
L
+
–
DCR
is negligible. So, during the t
DCR
= 0V (short-circuit) and V
ON
. The maximum current peak can be
L
L
⋅
⋅
I
I )
)
⋅
⋅
t
OUT
OFF
t
ON
=0 V) and depending on the
Short-circuit protection
LIM
.
CC
OFF
=Vinmax.
, the voltage
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