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| 型号： | MAX16946EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/21页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR MAX16946 |
| 其它有关文件： | Automotive Product Guide |
| 标准包装： | 1 |
| 主要目的： | 电源管理，LDO，开关 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MAX16946 |
| 主要属性： | 可调节开放负载和电流限制阈值 |
| 已供物品： | 板 |
MAX16946/MAX16947
Remote Antenna, Current-Sense and
LDO/Switches
R 2 =
V REF
? 1 ?
R SENSE OL V + 0.4V
× I
× A
R SENSE =
R 2 =
? 0.5 ? × 0.01A × 26V/V+0.4V ? 1 ?
Applications Information
Choosing the Sense Resistor
Ideally, the maximum load current develops the full-scale
sense voltage across the current-sense resistor. The
current-sense amplifier output voltage is given by:
V AOUT = A V x (V IN - V SENS ) + 0.4V
where V AOUT is the output voltage of the current-sense
amplifier, and A V is the gain of the current-sense ampli-
fier of 26V/V (typ).
Calculate the maximum value for R SENSE , so that the
amplified differential voltage across IN and SENS does
not exceed the short-circuit AOUT voltage threshold
of V SC = 1.7V (typ), which is defined in the Electrical
Characteristics table:
V SC ? 0.4V
I LOAD(FULL_SCALE) × A V
Typical sense resistor values range between 0.25 I and
2 I .
During normal operation, when the load current is less
than the short-circuit current threshold, the maximum
AOUT voltage is equal to V SC . When a short circuit to
ground is present and the device goes into autoretry,
the maximum AOUT voltage extends to V LIM , the volt-
age at LIM.
Keep inductance low if I SENSE has a large high-
frequency component. Wire-wound resistors have the
highest inductance, while metal film is somewhat better.
Low-inductance, metal-film resistors are also available.
Instead of being spiral wrapped around a core, as in
REF
metal-film or wire-wound resistors, they are a straight
band of metal and are available in values under 1 I .
Because of the high current that flows through R SENSE ,
eliminate parasitic trace resistance from causing errors
in the sense voltage.
Open-Load Current Threshold Selection
A resistive divider between REF, OLT, and GND sets the
open-load current threshold. See Figure 5.
Use the following formula to set the desired open-load
current threshold:
R 1
? ?
?
? ?
where I OL is the desired open-load current threshold,
A V is the current-sense amplifier gain (26V/V typical),
and V REF is the reference voltage (3V typ). Size R 1 and
R 2 large enough so that the equivalent resistance of the
resistive dividers used to set the open-load and current-
limit thresholds does not exceed the REF output 100 F A
drive capability.
For example, to set the open-load current threshold at
10mA, using a 0.5 I sense resistor, use the following
method to calculate the value of R 1 and R 2 :
R 1
? 3V ?
? ?
Choose R 1 = 470k I and calculate R 2 as 100k I .
REF
MAX16946
MAX16947
R 1
MAX16946
MAX16947
R 1
OLT
R 2
Figure 5. Open-Load Current Threshold Selection
16
LIM
R 2
Figure 6. Current-Limit Threshold Selection
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16946EVKIT# | 功能描述:电源管理IC开发工具 MAX16946 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX16946EVKIT+ | 功能描述:电源管理IC开发工具 MAX16946 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX16946GEE/V+ | 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MAX16946GEE/V+T | 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MAX16946GTE/V+ | 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
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