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參數(shù)資料
| 型號： | MAX1627 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 5V/3.3V or Adjustable, 100% Duty-Cycle, High-Efficiency, Step-Down DC-DC Controllers(降壓型,輸出電壓5V/3.3V，輸出電流2A的DC-DC變換器) |
| 中文描述： | 5V/3.3V或可調(diào)、100%占空比、高效率、降壓型DC-DC控制器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 222K |
| 代理商： | MAX1627 |
least 100 times FB’s input bias current. Capacitor C
R2
is used to compensate the MAX1627 for even switch-
ing. Values between 0pF and 330pF work for many
applications. See the Stability and MAX1627 Feedback
Compensationsection for details.
Current-S ense-Resistor S elec tion
The current-sense comparator limits the peak switching
current to V
CS
/R
SENSE
, where R
SENSE
is the value of
the current-sense resistor and V
CS
is the current-sense
threshold. V
CS
is typically 100mV, but can range from
85mV to 115mV. Minimizing the peak switching current
will increase efficiency and reduce the size and cost of
external components. However, since available output
current is a function of the peak switching current, the
peak current limit must not be set too low.
Set the peak current limit above 1.3 times the maximum
load current by setting the current-sense resistor to:
Alternatively, select the current-sense resistor for 5V
and 3.3V output applications using the current-sense
resistor graphs in Figures 6a and 6b. The current-sense
resistor’s power rating should be 20% higher than:
Standard wire-wound resistors have an inductance
high enough to degrade performance, and are not rec-
ommended. Surface-mount (chip) resistors have very
little inductance and are well suited for use as current-
sense resistors. Power metal-strip resistors feature
1/2W and 1W power dissipation, 1% tolerance, and
inductance below 5nH. Resistance values between
10m
and 500m
are available.
Induc tor S elec tion
The essential parameters for inductor selection are
inductance and current rating. The MAX1626/MAX1627
operate with a wide range of inductance values. In many
applications, values between 10μH and 68μH take best
advantage of the controller’s high switching frequency.
Calculate the minimum inductance value as follows:
(
where 2μs is the minimum on-time. Inductor values
between two and six times L
(MIN)
are recommended.
L
=
V+
- V
(MIN)
(MAX)
OUT
)
(
)
x
s
V
R
CS MIN
CS
2
μ
R
= V
R
POWER RATING (W)
2
CS
CS MAX
(
)
R
=
V
1.3 x I
CS
CS(MIN)
OUT(MAX)
M
5V /3.3V or Adjustable, 100% Duty-Cyc le,
High-Effic ienc y, S tep-Down DC-DC Controllers
_______________________________________________________________________________________
9
R3
C
R2
R2
FROM
OUTPUT
TO FB
Figure 5. Adjustable-Output Operation Using the MAX1627
4.5
5.5
INPUT VOLTAGE (V)
5.0
6.0
12
10
14
16
M
3.0
3.5
2.5
2.0
1.5
1.0
0
0.5
V
OUT
= 5V
R
SENSE
= 0.03
R
SENSE
= 0.04
R
SENSE
= 0.05
R
SENSE
= 0.1
Figure 6a. MAX1626 5V-Operation Current-Sense Resistor
Graph
3.0
4.0
INPUT VOLTAGE (V)
3.5
4.5
12
10
14
16
M
3.0
3.5
2.5
2.0
1.5
1.0
0
0.5
V
OUT
= 3.3V
R
SENSE
= 0.03
R
SENSE
= 0.04
R
SENSE
= 0.05
R
SENSE
= 0.1
Figure 6b. MAX1626 3.3V-Operation Current-Sense Resistor
Graph
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1627ESA | 功能描述:DC/DC 開關(guān)控制器 5/3.3V or Adjustable 100% Duty Cycle 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 |
| MAX1627ESA+ | 功能描述:DC/DC 開關(guān)控制器 5/3.3V or Adjustable 100% Duty Cycle 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 |
| MAX1627ESA+ | 制造商:Maxim Integrated Products 功能描述:CONTROLLER STEP DOWN DC-DC 1627 制造商:Maxim Integrated Products 功能描述:CONTROLLER, STEP DOWN, DC-DC, 1627 |
| MAX1627ESA+G071 | 功能描述:DC/DC 開關(guān)控制器 Adjustable 100% Duty-Cycle High-Efficiency Step-Down DC-DC Controller 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 |
| MAX1627ESA+T | 功能描述:DC/DC 開關(guān)控制器 5/3.3V or Adjustable 100% Duty Cycle 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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