STEVAL-ISA053V2 STMicroelectronics, STEVAL-ISA053V2 Datasheet - Page 34
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STEVAL-ISA053V2
Manufacturer Part Number
STEVAL-ISA053V2
Description
BOARD EVALUATION FOR PM6680A
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Specifications of STEVAL-ISA053V2
Design Resources
STEVAL-ISA053V2 Gerber Files PM6680A Eval Kit Schematic STEVAL-ISA053V2 Bill of Material
Main Purpose
DC/DC, Step Down with LDO
Outputs And Type
3, Non-Isolated
Voltage - Output
1.8V, 3.3V, 5V
Current - Output
2.5A, 2.5A, 100mA
Voltage - Input
6 ~ 28V
Regulator Topology
Buck
Frequency - Switching
200kHz, 300kHz
Board Type
Fully Populated
Utilized Ic / Part
PM6680A
Input Voltage
6 V to 36 V
Output Voltage
5 V
Product
Power Management Modules
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
PM6680A
Other names
497-6379
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-ISA053V2
Manufacturer:
STMicroelectronics
Quantity:
1
Design guidelines
34/48
Equation 22
Choose a synchronous rectifier with low R
variation of the phase node voltage can bring up even the low side gate through its gate-
drain capacitance C
that minimizes the ratio C
Below there is a list of some possible low side MOSFETs.
Table 10. Low side MOSFET manufacturer
Dual n-channel MOSFETs can be used in applications with a maximum output current of
about 3 A. Below there is a list of some MOSFET manufacturers.
Table 14.
A rectifier across the low side MOSFET 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. It
can increase the efficiency of the switching section, since it reduces the low side switch
losses. A shottky diode is suitable for its low forward voltage drop (0.3 V). The diode reverse
voltage must be greater than the maximum input voltage V
reverse charge is preferable. Below there is a list of some shottky diode manufacturers.
Table 15.
Manufacturer
Manufacturer
Manufacturer
ST
ST
ST
Dual MOSFET manufacturer
Schottky diode manufacturer
RSS
STPS1L40M
STS4DNF60L
P
, causing cross-conduction problems. Choose a low side MOSFET
Series
conduction
RSS
Type
STS7NF60L
/C
Type
GS
=
(C
R
Forward voltage
DSon
GS
R
DSon
= C
×
0.5
(V)
DSon
⎛
⎜ ⎜
⎝
50
R
1
ISS
[VC11] 19
DSon
(mΩ)
−
. When high side MOSFET turns on, the fast
V
- C
V
IN
OUT
(mΩ)
max
RSS
Gate charge
⎞
⎟ ⎟
⎠
).
×
Rated reverse
I
voltage (V)
LOAD
(nC)
15
INmax
0.0625
C
--------------
C
40
RSS
(max)
GS
. A minimum recovery
2
Rated reverse voltage
Rated reverse voltage
Reverse current
(V)
(V)
60
60
(uA)
21
PM6680A