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參數(shù)資料
| 型號(hào)： | EV1593DN-00A |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 3A, 28V, 385KHz Step-Down Converter |
| 中文描述： | 第3A，28V的，385KHz降壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大?。?/td> | 326K |
| 代理商： | EV1593DN-00A |
MP1593 – 3A, 28V, 385KHz STEP-DOWN CONVERTER
MP1593 Rev. 1.9
9/14/2006
www.MonolithicPower.com
9
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
Table 3—Compensation Values for Typical
Output Voltage/Capacitor Combinations
V
OUT
1.8V
L
C2
100
μ
F
Ceramic
47
μ
F
Ceramic
22
μ
Fx2
Ceramic
22
μ
Fx2
Ceramic
22
μ
Fx2
Ceramic
100
μ
F
SP-CAP
47
μ
F
SP-CAP
47
μ
F
SP-CAP
47
μ
F
SP CAP
560
μ
F Al.
30m
ESR
560
μ
F Al
30m
ESR
470
μ
F Al.
30m
ESR
220
μ
F Al.
30m
ESR
R3
5.6k
3.3nF
C3
C6
None
4.7
μ
H
2.5V
4.7-
6.8
μ
H
6.8-
10
μ
H
10-
15
μ
H
15-
22
μ
H
4.7
μ
H
3.9k
5.6nF
None
3.3V
5.6k
8.2nF
None
5V
7.5k
10nF
None
12V
10k
3.3nF
None
1.8
5.6k
3.3nF
100pF
2.5V
4.7-
6.8
μ
H
6.8-
10
μ
H
10-
15
μ
H
4.7-
6.8
μ
H
6.8-
10
μ
H
10-
15
μ
H
15-
22
μ
H
4.7k
5.6nF
None
3.3V
6.8k
10nF
None
5V
10k
10nF
None
2.5V
10k
5.6nF
1.5nF
3.3V
10k
8.2nF
1.5nF
5V
15k
5.6nF
1nF
12V
15k
4.7nF
390pF
To optimize the compensation components for
conditions not listed in Table 3, the following
procedure can be used.
1. Choose the compensation resistor (R3) to set
the desired crossover frequency. Determine R3
by the following equation:
FB
OUT
V
CS
EA
C
V
G
G
f
2
C
×
2
3
R
×
×
×
π
=
Where f
C
is the desired crossover frequency
(which typically has a value no higher than
38KHz).
2. Choose the compensation capacitor (C3) to
achieve the desired phase margin. For
applications with typical inductor values, setting
the compensation zero, f
Z1
, below one forth of
the crossover frequency provides sufficient
phase margin.
Determine C3 by the following equation:
C
f
3
R
2
4
3
C
×
×
π
>
Where R3 is the compensation resistor value.
3. Determine if the second compensation
capacitor (C6) is required. It is required if the ESR
zero of the output capacitor is located at less than
half of the 385KHz switching frequency, or the
following relationship is valid:
2
f
R
2
C
2
1
S
ESR
<
×
×
π
Where C2 is the output capacitance value, R
ESR
is
the ESR value of the output capacitor and f
S
is the
switching frequency. If this is the case, then add
the second compensation capacitor (C6) to set
the pole f
P3
at the location of the ESR zero.
Determine C6 by the equation:
3
R
R
2
C
6
C
ESR
×
=
Where C2 is the output capacitance value, R
ESR
is
the ESR value of the output capacitor and R3 is
the compensation resistor.
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.
MP1593
SW
BS
3
1
10nF
5V
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 (V
OUT
>12V) applications.
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