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参数资料
| 型号： | LSP6501MSAC |
| 厂商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.3 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | MSOP-8 |
| 文件页数： | 7/10页 |
| 文件大小： | 347K |
| 代理商： | LSP6501MSAC |
LSP6501
1.6A, 1.3MHz, Boost DC-DC Converter
With Internal Switch
VER. 1.2
6/10
there are DC voltages bias on them. The higher the DC bias, the lower the effective capacitance. The Zxx
serie
itors are similar.
s capacitors (ex: Z5U) often drop more capacitance than what Yxx series capacitors (ex: Y5V) will drop.
And Yxx series are usually worse than Xxx series (ex: X5R). Therefore, it is better to use X5R/X7R type of
ceramic capacitors and don’t use Yxx series (ex: Y5V) or Zxx series (ex: Z5U) types of capacitor. Although
they could be cheaper than X5R or X7R, Yxx series and Zxx series’ permanence is not as good as X5R/X7R
and is easier to have problems like audio noise problem.
The lifetime of a ceramic capacitor is shorter if the DC-bias is close to its maximum DC rating. For
example, to a VOUT=12V application, a 25VDC capacitor should have a longer lifetime than a 16VDC capacitor
does, even when other characteristics of these two capac
Electrolytic capacitors have higher ESR than what ceramic capacitors do. If electrolytic capacitors are
used as output capacitors, the ESR should be low enough to meet the VOUT ripple voltage requirement:
Ripple
I
ESR
OUT
<<
For example, if the V
ripple voltage of a 5V output DC/DC converter should be smaller tha
Voltage
Peak
to
Peak
Ripple
V
)
(
OUT
n
250mVPeak-to-Peak and if the ripple current is 0.5A, an c pacitor whose ESR is << (0.25V/0.5A)≒500m should
be chosen. A 680uF of ESR<500 m capacitor can be used in this case.
citors or other capacitors that the
ESR
high, the ripple current
coul
3. S
t capacitor of the Boost
Converter. The capacitor(s) is better to be X7R/X5R type.
uency is larger than 300KHz, although the cost of
ould be cheaper. The DC-R of the chock wire should be as low as possible to reduce the
pow
a
Note that the ESR of electrolytic capacitor is highly dependent on the temperature - the lower the
temperature the higher the ESR and vice versa. This temperature dependence causes VOUT ripple problem
and system stability problem sometimes. It may need to use tantalum capa
are temperature independent for applications that temperature ranges are wide.
It is important to ensure the ripple current rating of the output capacitor is enough or the capacitor might
burn out during operation. To most electrolytic capacitors, the body temperatures should not be higher than
environment temperature plus 10°C. If the body temperature of the capacitor is too
d be higher than the rating of the capacitor. For example, if the air temperature that close to the input
capacitor is 45°C, it is better that the body temperature is << (45°C + 10°C ) = 55°C.
election of Input Capacitor
It is recommended to put a ceramic capacitor(s) of several uF to 10uF as inpu
4. Selection of Inductor
It is recommended to use ferrite core as the chock material. Don’t use iron powder core because the core
loss will be too high for applications that the operation freq
an iron powder core c
er loss.
Below is an equation about the inductor value:
)
3
(
)
(
)
(
,
SW
MAX
OUT
f
I
V
,
2
,
η
MIN
IN
OUT
MIN
IN
Where,
V
Voltage
Input
Minimum
V
H
Value
Inductor
L
SW
MAX
OUT
MIN
:
)
(
:
)
(
:
)
(
:
)
(
:
)
(
:
,
η
Using a higher value inductor can reduce the power loss of the Boost converter. Anyway, a higher value
inductor often is bigger in size or has higher DC-R, and the higher DC-R may increase the inductor power loss.
Shielding inductor has better EMI performance but the DC-R is often higher than non-shielding inductors of
the s
=
V
L
Efficiency
Typical
Hz
Frequency
Switching
f
A
Current
Output
Maximum
I
V
Voltage
Output
Typical
V
OUT
IN ,
ame size.
It is recommended to adopt an inductor value that the DC/DC converter will not transfer from
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