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参数资料
| 型号： | NCV8141D2TR4 |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .5A D2PAK-7 |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 750 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 7 V ~ 26 V |
| 电压 - 压降（标准）： | 1.25V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 电流 - 限制（最小）： | 600mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-8，D²Pak（7 引线+接片），TO-263CA |
| 供应商设备封装： | D2PAK-7 |
| 包装： | 带卷 (TR) |
NCV8141
APPLICATION NOTES
NCV8141 DESIGN EXAMPLE
The NCV8141 with its unique integration of linear
regulator and control features: RESET, ENABLE and
WATCHDOG, provides a single IC solution for a
microprocessor power supply. The reset delay, reset
duration and watchdog frequency limit are all determined by
With a capacitor tolerance of ± 10%:
tWDI + (1.3 105) 1.2 1.1
tWDI + 141 ms (max)
tWDI + (1.3 105) 0.8 0.9
CDelay
CDELAY
a single capacitor. For a particular microprocessor the
overriding requirement is usually the reset delay (also
known as power on reset). The capacitor is chosen to meet
this requirement and the reset duration and watchdog
frequency follow.
The reset delay is given by:
tWDI + 76 ms (min)
The software must be written so that a watchdog signal
arrives at least every 76 ms.
tPOR(typ) + (4.75
105)CDELAY
FAIL
PASS
Assume that the reset delay must be 200 ms minimum.
From the NCV8141 data sheet the reset delay has a $ 37%
tolerance due to the regulator.
Assume the capacitor tolerance is $ 10%.
Hz
ms
7
141
13
76
tPOR(min) + (4.75
105
0.63)
CDELAY
0.9
Figure 12. WDI Signal for C Delay = 0.82 m F using
NCV8141
CDELAY(min) + POR
t (min)
2.69 105
CDELAY(min) + 0.743 m F
Closest standard value is 0.82 m F.
Minimum and maximum delays using 0.82 m F are 220 ms
and 586 ms.
The duration of the reset pulse is given by:
TWDI(RESET)(typ) + (1.0 104) CDELAY
This has a tolerance of ± 50% due to the IC, and ± 10% due
to the capacitor.
The duration of the reset pulse ranges from 3.69 ms to
13.5 ms.
The watchdog signal can be expressed as a frequency or
time. From a programmers point of view, time is more useful
since they must ensure that a watchdog signal is issued
consistently several times per second.
The watchdog time is given by:
tWDI + (1.3 105)CDELAY
There is a tolerance of ± 20% due to the NCV8141.
ENERGY CONSERVATION AND SMART FEATURES
Energy conservation is another benefit of using a
regulator with integrated microprocessor control features.
Using the NCV8141 as indicated in Figure 13, the
microprocessor can control its own power down sequence.
The momentary contact switch quickly charges C1 through
R1.
When the voltage across C1 reaches 3.95 V ( the enable
threshold), the output switches on and V OUT rises to 5.0 V.
After a delay period determined by C Delay , a frequency
programmable reset pulse train is generated at the reset
output. The pulse train continues until the correct watchdog
signal appears at the WDI lead. C1 is now left to discharge
through the input impedance of the enable lead
(approximately 150 k W ) and the enable signal disappears.
The output voltage remains at 5.0 V as long as the NCV8141
continues to receive the correct watchdog signal.
The microprocessor can power itself down by terminating
its watchdog signal. When the microprocessor finishes its
housekeeping or power down software routine, it stops
sending a watchdog signal. In response, the regulator
generates a reset signal and goes into a sleep mode where
V OUT drops to 0 V, shutting down the microprocessor.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8141D2TR4G | 功能描述:低压差稳压器 - LDO ANA WATCHDOG REG RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8184 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Micropower 70 mA Low Dropout Tracking Regulator/Line Driver |
| NCV8184/D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Micropower 70mA Low Dropout Tracking Regulator / Line Driver |
| NCV8184_06 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Micropower 70 mA Low Dropout Tracking Regulator/Line Driver |
| NCV8184D | 功能描述:低压差稳压器 - LDO 70mA Tracking RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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