参数资料
型号: NCP301LSN47T1G
厂商: ON Semiconductor
文件页数: 16/26页
文件大小: 0K
描述: IC VOLT DETECT OD 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: 开路漏极或开路集电极
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: NCP301LSN47T1GOSCT
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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