STEVAL-ISA052V1 STMicroelectronics, STEVAL-ISA052V1 Datasheet - Page 46
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STEVAL-ISA052V1
Manufacturer Part Number
STEVAL-ISA052V1
Description
KIT EVAL PM6675S HE CTLR 2A REG
Manufacturer
STMicroelectronics
Specifications of STEVAL-ISA052V1
Main Purpose
DC/DC, Step Down with LDO
Outputs And Type
2, Non-Isolated
Voltage - Output
1.5V, 0.6 ~ 3.3V
Current - Output
10A, 2A
Voltage - Input
4.5 ~ 28 V
Regulator Topology
Buck
Board Type
Fully Populated
Utilized Ic / Part
PM6675
Product
Power Management Modules
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Frequency - Switching
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
497-8426
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-ISA052V1
Manufacturer:
STMicroelectronics
Quantity:
1
Application information
8.1.6
46/53
VOUT current limit setting
The valley current limit is set by R
current. The valley of the inductor current I
Equation 46
The output current limit depends on the current ripple as shown in
Figure 48. Valley current limit waveforms
As the valley threshold is fixed, the greater the current ripple, the greater the DC output
current will be. If an output current limit greater than I
range is required, the minimum current ripple must be considered in the previous formula.
Then the resistor R
Equation 47
where R
temperature effect and the worst case value in R
The accuracy of the valley current also depends on the offset of the internal comparator (±5
mV).
The negative valley-current limit (if the device works in forced-PWM mode) is given by:
Equation 48
DSon
is the drain-source on-resistance of the low-side switch. Consider the
MAX LOAD 1
Current
Valley current limit
CSNS
Inductor current
is:
I
CSNS
Lvalley
R
CSNS
I
NEG
and must be chosen to support the maximum load
=
I
=
LOAD
Lvalley
MAX LOAD 2
=
R
DSon
110
R
(max)
100
DSon
DSon
is:
mV
⋅
uA
I
Lvalley
−
LOAD
calculation (typically +0.4 % / °C).
∆
2
I
L
(max) over all the input voltage
Inductor current
Figure 48
Time
:
PM6675S