參數(shù)資料
型號： MAX1980ETP
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter
中文描述： SWITCHING CONTROLLER, 550 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 5 X 5 MM, 0.80 MM HEIGHT, THIN, QFN-20
文件頁數(shù)： 21/33頁
文件大?。?/td> 1153K
代理商： MAX1980ETP
M
Quick-PWM Slave Controller with
Driver Disable for Multiphase DC-DC Converter
______________________________________________________________________________________
21
Current Limit Design Example
For the typical application circuit shown in Figure 1 V
IN
= 12V, V
OUT
= 1.3V, f
SW
= 300kHz,
η
= 2, I
LOAD(MAX)
= 50A, L = 0.6μH, R
DS(ON)(MAX)
= 6m
, R
DS(ON)(MIN )
= 3m
.
1) Determine the peak-to-peak inductor current and
the valley current limit:
2) Determine the master
’
s current-limit threshold from
the valley current limit and low-side MOSFETs
’
max-
imum on-resistance over temperature:
V
ITH(MASTER)
≥
21.8A
6m
= 130mV
Now select the resistive-divider values (R
A
and R
B
in Figure 5) to set the appropriate voltage at the
master
’
s ILIM input:
Selecting R
B
= 100k
±1% provides the following
value for R
A
:
3) Determine the slave
’
s current-limit threshold:
Select the resistive-divider values (R
C
and R
D
in
Figure 5) to set the appropriate voltage at the
slave
’
s ILIM input:
Selecting R
D
= 30.1k
±1% provides the following
value for R
A
:
4) Determine R
LIMIT
(Figure 5) from the above equation:
5) Finally, verify that that the total bias currents do not
exceed the 50μA maximum load of the master
’
s ref-
erence:
When unadjusted, the on-resistance variation of the
low-side MOSFETs results in a maximum current-limit
variation (
I
LIMIT
) determined by the following equation:
where A
RDS
= R
DS(ON)(MAX)
/R
DS(ON)(MIN)
. Using the
MAX1980 to adjust the master
’
s current-limit threshold
results in a maximum current-limit variation less than
the peak-to-peak inductor current:
Adjusted
I
LIMIT
≤
I
INDUCTOR
As shown in Figure 6, the resulting current-limit varia-
tion of the master is dramatically reduced. For the
above example, this control scheme reduces the cur-
rent-limit variation from 21.7A (unadjusted) to less than
6.4A (adjusted).
Output Capacitor Selection
The output filter capacitor must have low enough ESR to
meet output ripple and load-transient requirements, yet
have high enough ESR to satisfy stability requirements.
In CPU V
CORE
converters and other applications where
the output is subject to large load transients, the output
capacitor selection typically depends on how much
ESR is needed to prevent the output from dipping too
low under a load transient. Ignoring the sag due to
finite capacitance:
R
V
I
ESR
STEP
LOAD MAX
≤
(
)
Unadjusted
I
V
A
R
LIMIT
ITHM HIGH
(
RDS
DS ON MAX
(
=
)
)(
)
1
I
V
k
k
k
V
+
k
k
A
BIAS TOTAL
(
)
//
.
.
=
+
(
)
+
2
54
100
34 8
2
30 1
113
36
μ
R
k
k
3
x m
3
m
m
k
LIMIT
≤
(
)
≈
53 6
100
6
35
.
//
-
R
V
42
x
mV
x
k
k
C
=
≈
2
10
1
30 1
113
-
.
R
x
20
mV
A
μ
to
x
10
mV
A
μ
k
to
k
D
=
=
10
42
10
42
21
42
V
m
x
mV
m
6
A
mV
ITHS
≥
+
1 5
.
130
6 4
.
42
R
V
x
mV
x
k
k
A
=
≈
2
130
10
1
100
54
R
x
20
mV
A
μ
to
x
10
mV
A
μ
k
to
k
B
=
=
10
130
10
130
65
130
I
V x
300
V
V
.
V x
50
2
kHz x
2
H
A
I
A
x
A
A
INDUCTOR
LIMIT VALLEY
(
=
(
)
μ
=
=
=
1 3
.
12
1 3
0 6
12
6 4
.
1
6 4
.
21 8
.
.
)
-
-
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1980ETP+ 功能描述:DC/DC 開關(guān)控制器 PWM Slave Controller w/Driver Disable 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
MAX1980ETP+T 功能描述:DC/DC 開關(guān)控制器 PWM Slave Controller w/Driver Disable 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
MAX1980ETP+TG075 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1980ETP-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
MAX1980ETP-TG075 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
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