參數(shù)資料
型號(hào)： MAX1641D
廠商： Maxim Integrated Products, Inc.
英文描述： Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier
中文描述： 可調(diào)輸出，開(kāi)關(guān)模式同步整流電流源
文件頁(yè)數(shù)： 8/11頁(yè)
文件大?。?/td> 116K
代理商： MAX1641D
M
The voltage at SET is given by:
R1 = R2 (V
REF
/ V
SET
-1 ); 10k
< R2 < 300k
where V
REF
= 2V and V
SET
is proportional to the
desired output current level.
The MAX1640/MAX1641 are specified for V
SET
between 0V and V
REF
. For V
SET
> V
REF
, output current
increases linearly (with reduced accuracy) until it
clamps at V
SET
≈
4V.
Pulse-T ric kle Mode: S elec ting the
Pulse-T ric kle Current
Pulling D0 low and D1 high selects pulse-trickle mode.
This current equals V
SET
/ (13.3R
SENSE
) and remains
on for 12.5% of the period set by R
TOFF
. Pulse-trickle
current maintains full charge across the battery and
can slowly charge a cold battery before fast charging
commences.
Off Mode: T urning Off the Output Current
Pulling D0 and D1 low turns off the P-channel FET and
hence the output current flow. This mode also controls
end of charge and protects the battery against exces-
sive temperatures.
S etting the Maximum Output
V oltage Level
The maximum output voltage should be programmed to
a level higher than the output/battery voltage (I
LOAD
x
R
LOAD
). An external resistor-divider between the output
and ground (Figure 4) sets the voltage at TERM. Once
the voltage at TERM exceeds the reference, the internal
comparator turns off the P-channel FET, terminating
current flow. Select R4 in the 10k
to 500k
range.
R3 is given by:
R3 = R4 (V
OUT
/ V
TERM
) -1
PERIOD = 3.2 x 10 x R
(sec)
TOFF
Adjustable-Output, S witc h-Mode
Current S ourc e with S ync hronous Rec tifier
8
_______________________________________________________________________________________
D1
0
0
DO
0
1
MODE
OFF
Top-Off
OUTPUT CURRENT (A)
0
V
SET
/ (13.3R
SENSE
)
V
SET
/ (13.3R
SENSE
)
12.5% duty cycle
1
0
Pulse-Trickle
1
1
Fast Charge
V
SET
/ (13.3R
SENSE
)
Table 1. Selecting Output Current Levels
MAX1640
MAX1641
REF
SET
R1
R2
Figure 3. Adjusting the Output Current Level
MAX1640
CS+
TERM
CS-
R3
R
SENSE
BATT
L
R4
Figure 4a. Setting the Maximum Output Voltage Level
MAX1641
CS+
TERM
CS-
R3
BATT
R4
R
SENSE
L
Figure 4b. Setting the Maximum Output Voltage Level
相關(guān)PDF資料
PDF描述
MAX1641EEE Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier
MAX1642 High-Efficiency, Step-Up DC-DC Converters for 1V Inputs
MAX1642EUA High-Efficiency, Step-Up DC-DC Converters for 1V Inputs
MAX1643EUA High-Efficiency, Step-Up DC-DC Converters for 1V Inputs
MAX1642-MAX1643 High-Efficiency, Step-Up DC-DC Converters for 1V Inputs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1641EEE 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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
MAX1641EEE+ 功能描述:電流型 PWM 控制器 Adj-Out Switch Mode Current Source RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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
MAX1641EEE+T 功能描述:電流型 PWM 控制器 Adj-Out Switch Mode Current Source RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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
MAX1641EEE-T 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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
MAX1642EUA 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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