參數(shù)資料
型號： 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)動禁止功能，用于多相DC-DC轉(zhuǎn)換器
文件頁數(shù)： 12/33頁
文件大?。?/td> 1153K
代理商： MAX1980
M
Quick-PWM Slave Controller with
Driver Disable for Multiphase DC-DC Converter
12
______________________________________________________________________________________
The trigger input
’
s polarity is selected by connecting
POL to V
CC
(rising edge) or to GND (falling edge).
At the slave controller
’
s core is the one-shot that sets
the high-side switch
’
s on-time. This fast, low-jitter one-
shot adjusts the on-time in response to the input volt-
age and the difference between the inductor currents in
the master and the slave. Two identical transconduc-
tance amplifiers (G
MM
= G
MS
) integrate the difference
between the master and slave current-sense signals.
The summed output is connected to COMP, allowing
adjustment of the integration time constant with a com-
pensation capacitor connected at COMP. The resulting
compensation current and voltage may be determined
by the following equations:
(
=
+
where Z
COMP
is the impedance at the COMP output.
The PWM controller uses this integrated signal (V
COMP
)
to set the slave controller
’
s on time. When the master
and slave current-sense signals (CM+ to CM- and CS+
to CS-) become unbalanced, the transconductance
amplifiers adjust the slave controller
’
s on time, allowing
the slave inductor current to increase or decrease until
the current-sense signals are properly balanced:
= (Master
’
s on time) + (Slave
’
s on-time
correction due to current imbalance)
This control algorithm results in balanced inductor cur-
rents with the slave switching frequency synchronized to
the master. Since the master operates at nearly constant
frequency, the slave will as well. The benefits of a con-
stant switching frequency are twofold: first, the frequency
can be selected to avoid noise-sensitive regions of the
spectrum; second, the inductor ripple-current operating
point remains relatively constant, resulting in easy design
methodology and predictable output-voltage ripple.
Multiple phase switching effectively distributes the load
among the external components, thereby improving the
overall efficiency. Distributing the load current between
multiple phases lowers the peak inductor current by the
number of phases (1/
η
) when compared to a single-
phase converter. This significantly reduces the I
2
R losses
across the inductor
’
s series resistance, the MOSFETs
on-resistance, and the board resistance.
t
K
V
V
K
V
V
K
I
V
ON
COMP
IN
OUT
IN
COMP C
IN
=
=
+
I
V
G
V
V
G
V
V
V
I
Z
COMP
MM
CM
CM
MS
CS
CS
COMP
OUT
COMP
COMP
=
)
(
)
+
+
-
-
-
-
-
Table 2. Component Suppliers
MANUFACTURER
PHONE
COUNTRY CODE
WEBSITE
MOSFETS
Fairchild Semiconductor
International Rectifier
Siliconix
CAPACITORS
Kemet
Panasonic
1-888-522-5372
1-310-322-3331
1-203-268-6261
www.fairchildsemi.com
www.irf.com
www.vishay.com
1-408-986-0424
1-847-468-5624
www.kemet.com
www.panasonic.com
Sanyo
65-281-3226 (Singapore)
1-408-749-9714
www.secc.co.jp
Taiyo Yuden
03-3667-3408 (Japan)
1-408-573-4150
www.t-yuden.com
INDUCTORS
Coilcraft
Coiltronics
Sumida
1-800-322-2645
1-561-752-5000
1-408-982-9660
www.coilcraft.com
www.coiltronics.com
www.sumida.com
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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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