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参数资料
| 型号： | NCP300LSN47T1G |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/26页 |
| 文件大小： | 0K |
| 描述： | IC VOLT DETECT CMOS 4.7V 5TSOP |
| 标准包装： | 1 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 电压 - 阀值： | 4.7V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSOP（0.059"，1.50mm 宽）5 引线 |
| 供应商设备封装： | 5-TSOP |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCP300LSN47T1GOSCT |
NCP300, NCP301
So, V DET+_max can be easily figured out just using a single
variable V DET ? _typ .
For example, for NCP300LSN18T1G V DET ? _typ = 1.8 V;
then
V DET+_max + 1.8 1.09 + 1.962 V (eq. 8)
The NCP30X detection voltage option must be chosen such
that:
V CC_min t V DET+_max t V in_min (eq. 9)
PROPAGATION DELAY VARIATION
On the other hand (see above paragraph), a minimum
overdrive value from V threshold to V CC must be respected.
That means V in (minimum value of V CC ) must be higher
enough than V DET+ (V DET ? + hysteresis) at the risk of
significantly increasing propagation delay. (Figure 25) This
propagation delay is temperature sensitive.
To avoid acceptable time response, a minimum 100 mV
difference between V in and V DET+ must be selected.
The significance of V CC_min < V DET+_max is that it makes
sure the the reset from NCP30X remains asserted (in RESET
hold state) till after the power supply exceeds the V CC_min
requirement; this prevents incorrect device (uP) initiation.
Having V DET+_max < V in_min makes sure that the
NCP30X is able to start up when V in is at the V in_min .
The theoretical ideal V DET ? _typ voltage option to be
selected by the user, V DET ? _typ_ideal , can be given by the
following formula:
600
500
400
300
V DET+
t pHL
V DET ? _typ_ideal +
V in_min ) V CC_min
(2 1.09)
(eq. 10)
200
100
t pLH
3.168
The following example shows how to select the device
voltage option in a real world application.
1. Power supply output specification: 3.3 V $ 3%
2. Microprocessor core voltage specification: 3.3 V
$ 5%
So, we have:
V in_min + 3.3 V * 3% + 3.201 V (eq. 11)
V CC_min + 3.3 V * 5% + 3.135 V
(eq. 12)
0
3.0 3.5 4.0 4.5 5.0
V in , PULSE HIGH INPUT VOLTAGE (V)
Figure 25. t pLH and t pHL vs. Input Voltage
for the NCP301SNT1
5.5
Then the ideal voltage option = (3.201 + 3.135) / (2 * 1.09)
= 2.9064 V
Therefore, a device voltage option of 2.9 V will be the right
choice.
http://onsemi.com
16
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相关代理商/技术参数 |
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| NCP300LSN48T1 | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel 制造商:ON Semiconductor 功能描述: |
| NCP300LSN49T1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:ON Semiconductor 功能描述: |
| NCP301 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Voltage Detector Series |
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| NCP3011DTBR2G | 功能描述:电压模式 PWM 控制器 Single Output Buck 0.8V to 40V 70uA RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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