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参数资料
| 型号： | MAX16913GEE/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/10页 |
| 文件大小： | 0K |
| 描述： | IC CURRENT SENSE SWITCH 16QSOP |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 电流感应放大器，电流开关 |
| 电流 - 电源： | 600µA |
| 电源电压： | 5 V ~ 18 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
Remote Antenna Current-Sense
Amplifier and Switches
Applications Information
Choosing the Sense Resistor
Ideally, the maximum load current develops the full-
REF
scale sense voltage across the current-sense resistor.
The current-sense amplifier output voltage is given by:
MAX16913
R 1
OLT
V AOUT (V) = [(V IN - V SENS )(V) x A V (V/V)] + 0.4(V)
where V AOUT is the output voltage of the current-sense
amplifier, and A V is the gain of the current-sense amplifier
of 13V/V (typ). Calculate the maximum value for R SENSE
so that the differential voltage across IN and SENS does
not exceed the minimum full-scale sense voltage (87mV):
Figure 3. Open-Load Threshold Selection
R 2
R SENSE ( Ω ) =
V DIFF(MIN) (V)
I LOAD(FULL-SCALE) (A)
For example, to set the open-load threshold at 10mA,
using a 1 Ω sense resistor, use the following method to
calculate the value of R 1 and R 2 :
where V DIFF(MIN) = V IN - V SENS = 87mV minimum at
maximum load current.
Use resistors specified for current-sensing applications
R 2 (k Ω )
(R 1 +R 2 )(k Ω )
=
(1 ( Ω ) × 0 . 01 ( A ) × 13 (V/V))+ 0.4V
3(V)
= 0.177
with a minimum resistance value of 0.65 Ω , and the
maximum resistance value of 4.7 Ω . 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 metal-film or wire-
wound resistors, they are a straight band of metal and
are available in values under 1 Ω . Because of the high
current that flows through R SENSE , avoid parasitic trace
resistance from causing errors in the sense voltage.
Open-Load Threshold Selection
For the MAX16913A, a resistive divider between REF,
OLT, and GND sets the open-load threshold. See
Figure 3.
Use the following formula to set the desired open-load
threshold:
Choose R 1 = 470k Ω and calculate R 2 as 101k Ω .
Input Capacitor
Connect a low-leakage ceramic capacitor from IN to
GND to limit the input voltage drop during momentary
output short-circuit conditions, and to protect the
device against transients due to inductance in the IN
line. For example, use at least a 0.1μF ceramic capaci-
tor if the input inductance (including any stray induc-
tance) is estimated to be 20μH. Larger capacitor values
reduce the voltage undershoot at the input.
Output Capacitor
In an analogous fashion to the input capacitor, an out-
put capacitor protects the device against transients
due to any series inductance in the output. Under no
conditions should the OUT pin voltage go below -0.3V
as specified in the Absolute Maximum Ratings. If a
capacitor alone is not sufficient to avoid large negative
R 2 (k Ω )
(R 1 +R 2 )(k Ω )
=
(R SENSE ( Ω ) × I OL ( A ) × A V (V/V))+ 0.4V
V REF (V)
transients on OUT, then a Schottky diode should be
used to clamp transients which go below ground. With
a 100μH output series inductor, a 220μF output capaci-
tor is needed to eliminate potential problems. With larg-
where I OL is the desired open-load current threshold;
A V is the current-sense amplifier gain (13V/V typ), and
V REF is the reference voltage (+3V typ). The sum of R 1
and R 2 should be large enough so that the output
impedance of the internal reference (5k Ω ) is negligible
compared to the sum of R 1 and R 2 , and has a minimum
effect on the accuracy of the adjusted open-load
threshold.
er inductor values or smaller capacitors, a Schottky
clamp diode will be necessary.
Layout and Thermal Dissipation
To optimize the switch response time to output short-
circuit condition, it is very important to keep all traces
as short as possible to reduce the effect of undesirable
parasitic inductance. Place input and output capacitors
as close as possible to the device (no more than 5mm).
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| MAX16914AUB/V+ | 功能描述:监控电路 Over Volt protector Ideal Diode RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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