STEVAL-ISA052V2 STMicroelectronics, STEVAL-ISA052V2 Datasheet - Page 41

• Manufacturer Part Number: STEVAL-ISA052V2
• Description: BOARD EVAL BASED ON PM6675A
• Manufacturer: STMicroelectronics
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of STEVAL-ISA052V2

• Design Resources: STEVAL-ISA052V2 Gerber Files STEVAL-ISA052V2 Schematic STEVAL-ISA052V2 Bill of Material
• Main Purpose: DC/DC, Step Down with LDO
• Outputs And Type: 2, Non-Isolated
• Voltage - Output: 1.5V, 0.6 ~ 3.3V
• Voltage - Input: 4.5 ~ 36 V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: PM6675AS
• Input Voltage: 4.5 V to 36 V
• Output Voltage: 1.5 V
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed
• For Use With/related Products: PM6675AS
• Other names: 497-8413

PM6675AS
8.1.5
8.1.6
Diode selection
A rectifier across the synchronous switch is recommended. The rectifier works as a voltage
clamp across the synchronous rectifier and reduces the negative inductor swing during the
dead time between turning the high-side MOSFET off and the synchronous rectifier on.
Moreover it increases the efficiency of the system.
The reverse voltage should be greater than the maximum input voltage V
minimum recovery reverse charge is preferable.
Table 17.
VOUT current limit setting
The valley current limit is set by R
current. The valley of the inductor current I
Equation 45
The output current limit depends on the current ripple as shown in
Figure 38. Valley current limit waveforms
Being fixed the valley threshold, the more the current ripple is greater, the more the DC
output current is greater. If an output current limit greater than over all the input voltage
range is required, the minimum current ripple must be considered in the previous formula.
Then the resistor R
Equation 46
Manufacturer
ST
ST
ST
Evaluated free-wheeling rectifiers
MAX LOAD 1
Current
Valley current limit
CSNS
Inductor current
is:
STPS1L30M
STPS1L30A
STPS1L60A
Type
I
CSNS
Lvalley
R
CSNS
and must be chosen to support the maximum load
=
Inductor current
I
=
LOAD
Lvalley
MAX LOAD 2
R
DSon
Forward voltage (V)
(max)
100
Table 17
is:
⋅
uA
I
Lvalley
−
0.34
0.34
0.56
∆
2
I
L
shows some evaluated diodes.
Application information
Figure 38
Time
Rated reverse
voltage (V)
INmax
30
30
60
:
and a
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