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RNA51957APT0 Datasheet(PDF) 11 Page - Renesas Technology Corp |
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RNA51957APT0 Datasheet(HTML) 11 Page - Renesas Technology Corp |
11 / 14 page RNA51957A, B Preliminary R03DS0010EJ0500 Rev.5.00 Page 11 of 13 Jun 19, 2012 Setting of Delay Capacity Please use capacitor Cd for the delay within the range of 10 F or less. When a value that is bigger than this is set, the problem such as following (1), (2), and (3) becomes remarkable. t VCC Output tpd tPHL Figure 9 Time Chart at Momentary Voltage-Decrease (1) The difference at delay time becomes remarkable. A long delay setting of tens of seconds is fundamentally possible. However, when set delay time is lengthened, the range of the difference relatively grows, too. When a set value is assumed to be ‘tpd’, the difference occurs in the range from 0.47 tpd to 2.05 tpd. For instance, 34 seconds can be calculated at 100 F. However, it is likely to vary within the ranges of 16-70 seconds. (2) Difficulty to react to a momentary voltage decrease. For example, the reaction time tPHL is 10 s when delay capacitor Cd = 0.1 F. The momentary voltage-decrease that is longer than such tPHL are occurs, the detection becomes possible. When the delay capacitance is enlarged, tPHL also becomes long. For instance, it becomes about 100 to 200 s in case of circuit constant C1 = 100 F. (Characteristic graph 1 is used and extrapolation in case of Cd = 100 F.) Therefore, it doesn't react to momentary voltage-decrease that is shorter than this. (3) Original delay time is not obtained. When the momentary voltage-decrease time ‘t’ is equivalent to tPHL, the discharge becomes insufficient and the charge starts at that state. This phenomenon occurs at large capacitance. And, original delay time tpd is not obtained. Please refer to characteristic graph 2. (Delay time versus input pulse width) 0.01 0.1 1 Delay Capacitance Cd ( μF) 10 100 1000 1 10 100 200 1 10 100 Pulse Width ( μs) Characteristic Graph 2 Delay Time vs. Momentary Voltage Decrease Pulse Width (Example data) Characteristic Graph 1 Reaction Time vs. Delay Capacitance (Example data) 1000 10000 10000 1000 100 10 1 0.01 μF Delay Capacitance 0.033 μF 0.1 μF 0.33 μF 1 μF 2.2 μF 3.3 μF Figure 10 Characteristic Graph |
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