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STLD20D-DEF bảng dữ liệu(PDF) 17 Page - STMicroelectronics

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STLD20D-DEF bảng dữ liệu(HTML) 17 Page - STMicroelectronics

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STLD20D
Components selection
17/31
7.2
CIN and COUT capacitors selection
The capacitance values and its intrinsic resistance (ESR) must be selected in order to
reduce the output ripple.
The ceramic capacitor technology offers the best compromise between the space and the
performance (low ESR, value, voltage rating). Nevertheless, their values changes with the
time as well as with temperature, DC bias voltage and switching frequency. Thus it might be
necessary to use higher capacitor value if low ripple is an absolute need.
7.3
1.3. D, Boost diode selection
The diode selection is based upon two major criteria:
●
Low losses to get the best converter efficiency
●
Mechanical size
7.3.1
Electrical characteristic
VRRM (Repetitive peak reverse voltage) is the first parameter to consider in the selection of
the boost diode. Its value must be always higher than the reverse voltage (VR) occurring
during the steady state. Note that, some transient voltages occurs during the commutation
period due to the leakage inductance of the PCB. Generally, a power diode with a maximum
reverse voltage equal or just higher than 20V suits perfectly. Therefore a Schottky diode
technology can be used.
Schottky diode has a low forward voltage, nevertheless they have an additional reverse
current which provides additional losses at high ambient temperature.
Table 5.
Reference selection
Name
Ref
Height (mm)
L typ (µH)
DCR (
Ω)ISAT (A)
Murata
LQH32CN4R7M33
2
4.7
0.15
0.65
LQH32CN100K33
2
10
0.3
0.45
LQH32CN4R7M53
1.55
4.7
0.15
0.65
LQH32CN100K53
1.55
10
0.3
0.45
Coilcraft
LP04815-472MXC
1.5
4.7
0.15
0.77
LP04815-103MXC
1.5
10
0.23
0.55
Wurth Elektronik
(WE)
744031100
1.65
10
0.205
0.74
744031150
1.65
15
0.285
0.62
744042100
1.8
10
0.15
1.3
Sumida
CDRH2014-100
1.855
10
0.294
0.7
CLS4D14
1.5
6.8
0.13
0.8
CLS4D14
1.5
10
0.18
0.65
TDK
VLF3010AT 100HR49
shielded
10
10
0.67
0.49



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