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参数资料
| 型号： | MAX1640EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT MAX1640, MAX1641 |
| 标准包装： | 1 |
| 系列： | * |
MAX1640/MAX1641
Adjustable-Output, Switch-Mode
Current Source with Synchronous Rectifier
The voltage at SET is given by:
R1 = R2 (V REF / V SET -1 ); 10k Ω < R2 < 300k Ω
where V REF = 2V and V SET is proportional to the
MAX1641
L
desired output current level.
BATT
Table 1. Selecting Output Current Levels
D1
0
0
1
1
DO
0
1
0
1
MODE
OFF
Top-Off
Pulse-Trickle
Fast Charge
OUTPUT CURRENT (A)
0
V SET / (13.3R SENSE )
V SET / (13.3R SENSE )
12.5% duty cycle
V REF / (13.3R SENSE )
CS+
CS-
TERM
R SENSE
R3
R4
Figure 3b. Setting the Maximum Output Voltage Level
The MAX1640/MAX1641 are specified for V SET
between 0V and V REF . For V SET > V REF , output current
PERIOD = 3.2 x 10 x R TOFF (sec)
MAX1640
MAX1641
REF
R1
SET
R2
Figure 2. Adjusting the Output Current Level
L
MAX1640
CS+
R SENSE
CS-
increases linearly (with reduced accuracy) until it
clamps at V SET ≈ 4V.
Pulse-Trickle Mode: Selecting the
Pulse-Trickle 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.
-7
Off Mode: Turning 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.
Setting the Maximum Output
Voltage Level
The maximum output voltage should be programmed to
TERM
R3
R4
BATT
a level higher than the output/battery voltage (I LOAD x
R LOAD ). An external resistor-divider between the output
and ground (Figure 3) 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 Ω to 500k Ω range.
R3 is given by:
Figure 3a. Setting the Maximum Output Voltage Level
R3 = R4 ((V OUT / V TERM ) -1)
8
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1641C/D | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1641EEE | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1641EEE+ | 功能描述:电流型 PWM 控制器 Adj-Out Switch Mode Current Source RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1641EEE+T | 功能描述:电流型 PWM 控制器 Adj-Out Switch Mode Current Source RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1641EEE-T | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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