參數(shù)資料
型號(hào)： MAX8543
廠商： Maxim Integrated Products, Inc.
英文描述： Dual J-K Negative-Edge-Triggered Flip-Flops With Clear And Preset 16-CDIP -55 to 125
中文描述： 降壓型控制器，具有預(yù)偏置啟動(dòng)、無損檢測(cè)、同步整流和OVP
文件頁數(shù)： 24/27頁
文件大?。?/td> 399K
代理商： MAX8543
M
S tep-Down Controllers with Prebias S tartup,
Lossless S ensing, S ync hronization, and OV P
24
______________________________________________________________________________________
The crossover frequency, f
C
, should be much higher
than the power-modulator pole f
PMOD
. Also, f
C
should
be less than or equal to 1/5th the switching frequency.
Select a value for f
C
in the range:
At the crossover frequency, the total loop gain must
equal 1, and is expressed as:
For the case where f
zMOD
is greater than f
C
:
then R
C
can be calculated as:
where g
mEA
= 110μS.
The error-amplifier compensation zero formed by R
C
and C
C
should be set at the modulator pole f
PMOD
. C
C
is calculated by:
×
+
(
If f
zMOD
is less than 5 x f
C
, add a second capacitor C
F
from COMP to GND. The value of C
F
is calculated as
follows:
As the load current decreases, the modulator pole also
decreases; however, the modulator gain increases
accordingly and the crossover frequency remains
the same.
For the case where f
zMOD
is less than f
C
:
The power-modulator gain at f
C
is:
The error-amplifier gain at f
C
is:
R
C
is calculated as:
where g
mEA
= 110μS.
C
C
is calculated from:
C
F
is calculated from:
Below is a numerical example to calculate R
C
and C
C
values of the typical operating circuit of Figure 1
(MAX8544):
A
VCS
= 11 (for ILIM1 = GND)
R
DC
= 2.5m
g
mc
= 1 / (A
VCS
x R
DC
) = 1 / (11 x 0.0025) = 36.7S
V
OUT
= 2.5V
I
OUT(MAX)
= 15A
R
LOAD
= V
OUT
/ I
OUT(MAX)
= 2.5 / 15 = 0.167
C
OUT
= 360μF
ESR = 5m
G
g
R
f
f
L
L
R
MOD dc
mc
LOAD
LOAD
S
S
(
)
(
)
.
.
(
)
.
.
(
)
.
.
=
×
×
×
×
+
=
×
×
(
(
)
)
+
×
=
36 36
0 167
600 10
0 8 10
0 167
600 10
0 8 10
4 50
3
6
3
6
C
R
f
F
C
zMOD
=
×
×
1
2
π
C
R
(
f
L
×
C
)
×
)
R
f
L
R
C
LOAD
LOAD
S
(
OUT
S
C
=
×
× ×
+
R
V
V
f
g
G
f
C
OUT
FB
C
mEA
MOD fc
zMOD
=
×
×
×
(
)
G
g
R
f
f
EA fc
mEA
C
zMOD
C
(
)
=
×
×
G
G
f
f
MOD fc
MOD dc
pMOD
zMOD
(
)
(
)
=
×
C
R
f
F
C
zMOD
=
×
×
1
2
π
C
R
f
L
×
C
)
×
)
R
f
L
R
C
LOAD
LOAD
S
(
OUT
S
C
=
× ×
R
V
g
V
G
C
OUT
FB
mEA
MOD fc
=
×
×
(
)
G
G
f
f
MOD fc
MOD dc
pMOD
C
(
)
(
)
=
×
G
g
R
EA fc
mEA
C
(
)
=
×
G
G
V
V
EA fc
MOD fc
FB
OUT
(
)
(
)
×
×
=
1
f
f
f
pMOD
C
S
5
<<
≤
f
C
R
pEA
F
C
=
×
×
1
2
π
f
C
R
zEA
C
C
=
×
×
1
2
π
相關(guān)PDF資料
PDF描述
MAX8544 Dual J-K Negative-Edge-Triggered Flip-Flops With Clear And Preset 20-LCCC -55 to 125
MAX8546EUB PLASTIC ENCAPSULATED DEVICES
MAX8556 3-Line To 8-Line Decoders/Demultiplexers 16-CFP -55 to 125
MAX8556ETE 3-Line To 8-Line Decoders/Demultiplexers 20-LCCC -55 to 125
MAX8557 3-Line To 8-Line Decoders/Demultiplexers 16-CFP -55 to 125
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX8543EEE 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX8543EEE+ 功能描述:電流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX8543EEE+T 功能描述:電流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX8543EEE-T 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX8544EEP 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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