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SS23 数据表(PDF) 8 Page - Monolithic Power Systems

部件名 SS23
功能描述  2A, 380 KHz Step-Down Converter
Download  10 Pages
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制造商  MPS [Monolithic Power Systems]
网页  http://www.monolithicpower.com
标志 MPS - Monolithic Power Systems

SS23 数据表(HTML) 8 Page - Monolithic Power Systems

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MP1580 – 2A, 380KHz STEP-DOWN CONVERTER
MP1580 Rev. 3.0
www.MonolithicPower.com
8
12/5/2005
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
TM
Determine
if
the
second
compensation
capacitor, C6, is required. It is required if the
ESR zero of the output capacitor happens at
less than four times the crossover frequency.
Or:
1
f
R
2
C
8
C
ESR
×
×
×
π
or
1
V
R
3
R
10
34
.
7
OUT
ESR
5
×
×
×
If
this
is
the
case,
add
the
second
compensation capacitor. Determine the value
by the equation:
3
R
R
2
C
6
C
)
MAX
(
ESR
×
=
Where RESR(MAX) is the maximum ESR of the
output capacitor.
For example:
VOUT = 3.3V
C2= 22µF Ceramic (ESR = 10mΩ)
=
×
×
×
×
k
9
.
9
)
3
.
3
(
)
10
22
(
)
10
37
.
1
(
3
R
6
8
Use the nearest standard value of 10kΩ.
nF
6
.
1
10
10
3
.
3
)
10
22
(
22
.
0
3
C
3
6
=
×
×
×
×
>
Use a standard value of 2nF
014
.
0
f
R
2
C
2
C
ESR
=
×
×
×
π
which is less than 1, therefore no second
compensation capacitor is required.
Table 5—Recommended Components for
Standard Output Voltages
VOUT
R1
L1 Minimum
1.22V
0Ω
6.8µH
1.5V
2.32kΩ
6.8µH
1.8V
4.75kΩ
10µH
2.5V
10.5kΩ
10µH
3.3V
16.9kΩ
15µH
5.0V
30.9kΩ
22µH
Negative Output Voltage
The MP1580 can be configured as a buck-
boost regulator to supply negative output
voltage.
Because the GND pin of the IC is now
connected to the negative output voltage, the
maximum allowable input voltage is the IC input
voltage rating (25V) minus the negative output
voltage value. A typical application circuit is
shown in Figure 3.
External Bootstrap Diode
It is recommended that an external bootstrap
diode be added when the system has a 5V
fixed input or the power supply generates a 5V
output. This helps improve the efficiency of the
regulator. The bootstrap diode can be a low
cost one such as IN4148 or BAT54.
MP1580
SW
BS
10nF
5V
MP1580_F02
Figure 2—External Bootstrap Diode
This diode is also recommended for high duty
cycle operation (when
IN
OUT
V
V
>65%) and high
output voltage (VOUT>12V) applications.


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