參數(shù)資料
型號(hào)： MAX1980
廠商： Maxim Integrated Products, Inc.
元件分類： DC/DC變換器
英文描述： Quick-PWM Slave Controller with Driver Disable for Multiphase DC-DC Converter
中文描述： Quick-PWM從控制器，帶有驅(qū)動(dòng)禁止功能，用于多相DC-DC轉(zhuǎn)換器
文件頁(yè)數(shù)： 20/33頁(yè)
文件大小： 1153K
代理商： MAX1980
M
Quick-PWM Slave Controller with
Driver Disable for Multiphase DC-DC Converter
20
______________________________________________________________________________________
where V
ITHM
, the master
’
s current-limit threshold, is typ-
ically 1/10th the voltage seen at the master
’
s ILIM input
(V
ITHM
= 0.1
V
LIM(MASTER)
, see the master con-
troller
’
s data sheet). Connect a resistive voltage-divider
from the master controller
’
s internal reference to GND,
with the master
’
s ILIM input connected to the center tap
(Figure 5). Use 1% tolerance resistors in the divider with
10μA to 20μA DC bias current to prevent significant
errors due to the ILIM pin
’
s input current:
Configure the slave controller so its LIMIT output begins
to roll off after the master current-limit threshold occurs:
where V
ITHS
, the slave
’
s current-limit threshold, is pre-
cisely one-tenth the voltage seen at the slave
’
s ILIM
input (V
ITHS
= 0.1
V
ILIM(SLAVE)
). Connect a second
resistive voltage-divider from the master controller
’
s
internal reference to GND, with the slave
’
s ILIM input
connected to the center tap (Figure 5). The external
adjustment range of 400mV to 1.5V corresponds to a
current-limit threshold of 40mV to 150mV. Use 1% toler-
ance resistors in the divider with 10μA to 20μA DC bias
current to prevent significant errors due to the ILIM
pin
’
s input current. Reducing the current-limit threshold
voltage lowers the sense resistor
’
s power dissipation,
but this also increases the relative measurement error:
Now, set the current-limit adjustment ratio (A
ADJ
=
V
ITHM(HIGH)
/V
ITHM(LOW)
) greater than the maximum to
minimum on-resistance ratio (A
RDS
= R
DS(ON)(MAX)
/
R
DS(ON)(MIN)
):
≥
+
Increasing A
ADJ
improves the master
’
s current-limit
accuracy but also increases the current limit
’
s noise
sensitivity. Therefore, R
LIMIT
may be selected using the
following equation:
(
(
)(
Finally, verify that the total load on the master
’
s refer-
ence does not exceed 50μA:
I
V
R
R
R
V
R
R
A
BIAS TOTAL
(
REF
B
//
A
LIMIT
REF
C
+
D
)
=
+
(
)
+
≤
50
μ
R
R
R R
R
R
LIMIT
A
DS ON MIN
DS ON MAX
DS ON MIN
(
≤
//
(
)(
)
)
)(
)
//
(
)(
)
(
)(
)
A
A
R
R
R
R
R
ADJ
ROS
A
LIMIT
B
DS ON MAX
DS ON MIN
≥
1
V
A
R
V
A
R
V
V
R
ILIM SLAVE
(
20
μ
D
ILIM SLAVE
(
10
μ
C
REF MASTER
(
ILIM SLAVE
(
D
)
)
)
)
1
≤
≤
=
V
R
V
R
I
ITHS
CM
ITHM HIGH
(
DS ON MAX
(
INDUCTOR
≥
+
)
)(
)
V
A
R
V
A
R
V
V
R
ILIM MASTER
(
20
μ
B
ILIM MASTER
(
10
μ
A
REF MASTER
(
ILIM MASTER
(
B
)
)
)
)
1
≤
≤
=
MAX1718
MAX1980
SLAVE
CONTROLLER
ILIM
LIMIT
MASTER
CONTROLLER
REF
ILIM
R
C
R
LIMIT
C
LIMIT
R
D
R
A
R
B
C
REF
Figure 5. Setting the Adjustable Current Limits
V
R
R
R
V
V
R
+
(
R
R
R
R
V
V
R
R
R
V
ITHM HIGH
(
B
+
A
B
REF
ITHM LOW
(
B
LIMIT
LIMIT
//
A
B
REF
ITHS
D
+
C
D
REF
)
)
//
=
=
)
=
1
10
1
10
1
10
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1980EGP 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
MAX1980EGP-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 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+ 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
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