參數(shù)資料
型號： 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、無損檢測、同步整流和OVP
文件頁數(shù)： 25/27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
______________________________________________________________________________________
25
3.43kHz << f
C
< 120kHz; select f
C
= 120kHz.
Since f
zMOD
< f
C
:
Select the nearest standard value: C
C
= 220pF
Select the nearest standard value: C
F
= 10pF:
R3 = R
C
= 220k
C8 = C
C
= 220pF
C7 = C
F
= 10pF
Applic ations Information
PC Board Layout Guidelines
Careful PC board layout is critical to achieve low
switching losses and clean, stable operation. The
switching power stage requires particular attention.
Follow these guidelines for good PC board layout:
1)
Place IC decoupling capacitors as close to IC pins
as possible. Keep separate the power ground
plane and the signal ground plane. Place the input
ceramic decoupling capacitor directly across and
as close as possible to the high-side MOSFET’s
drain and the low-side MOSFET’s source. This is to
help contain the high switching current within this
small loop.
2)
For output current greater than 10A, a four-layer PC
board is recommended. Pour a signal ground
plane in the second layer underneath the IC to min-
imize noise coupling.
3)
Connect input, output, snubber, and VL capacitors
to the power ground plane; connect all other
capacitors to the signal ground plane.
4)
Place the inductor current-sense resistor and capaci-
tor as close to the inductor as possible. Make a
Kelvin connection to minimize the effect of PC board
trace resistance. Place the input bias balance resistor
and bypass capacitor (R5 and C10 in Figures 7 and
8) near CS-. Run two closely parallel traces from
across the capacitor (C9 in Figures 7 and 8) to CS+
and CS-. Place the decoupling capacitor C11 close
to CS+ and CS- pins.
5)
Place the MOSFET as close as possible to the IC to
minimize trace inductance of the gate-drive loop. If
parallel MOSFETs are used, keep the trace lengths
to both gates equal.
6)
Connect the drain leads of the power MOSFET to a
large copper area to help cool the device. Refer to
the power MOSFET data sheet for recommended
copper area.
7)
Place the feedback and compensation components
as close to the IC pins as possible. Connect the
feedback-divider resistor from FB to the output as
close as possible to the farthest output capacitor.
Refer to the MAX8544 evaluation kit for an example layout.
C
R
f
pF
F
C
zMOD
=
×
×
=
×
×
×
=
1
2
1
2
220 10
(
88 4
(
10
8 2
.
3
3
π
π
)
.
)
C
R
f
+
L
×
C
)
×
)(0 8 10
3
R
f
L
R
pF
C
LOAD
S
OUT
LOAD
S
C
=
×
×
×
(
=
×
+
=
.
(
)(
6
)
3
.
(
)(0 8 10
) (
)
0 167 600 10
360 10
0 167
600 10
220 10
202
3
6
6
R
V
V
f
g
G
f
k
C
OUT
FB
C
mEA
MOD fc
zMOD
=
×
×
×
=
×
×
×
×
=
(
)
.
.
(
)
.
(
.
)
2 5
0 8
120 10
110 10
0 175
88 4
10
220
3
6
3
G
G
f
f
MOD fc
MOD dc
pMOD
zMOD
3
(
)
(
)
.
.
.
.
=
×
=
×
×
=
4 5
3 43 10
88 4
10
0 175
3
f
C
ESR
1
kHz
zMOD
OUT
=
×
×
=
×
×
=
1
2
2
360 10
0 005
.
88 4
6
π
π
(
)
.
f
f
f
pMOD
C
S
5
<<
≤
f
C
R
R
f
f
L
L
ESR
kHz
pMOD
OUT
LOAD
LOAD
S
S
=
×
×
×
+
×
×
+
=
×
×
×
×
+
×
+
=
1
2
1
2
360 10
0 167
.
600 10
(
0 8 10
.
0 167
.
600 10
(
0 8 10
.
0 005
.
3 43
.
6
3
6
3
6
π
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 上升時間: 下降時間: 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 上升時間: 下降時間: 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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