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RNA51953B Datasheet(PDF) 7 Page - Renesas Technology Corp |
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RNA51953B Datasheet(HTML) 7 Page - Renesas Technology Corp |
7 / 10 page RNA51953A,B REJ03D0911-0100 Rev.1.00 Oct 10, 2008 Page 7 of 9 Notice for use About the Power Supply Line 1. About bypass capacitor Because the ripple and the spike of the high frequency noise and the low frequency are superimposed to the power supply line, it is necessary to remove these. Therefore, please install C1 and C2 for the low frequency and for the high frequency between the power supply line and the GND line as shown in following figure 3. Power-supply Output VCC RNA51953 GND C2 C1 + Delay capacitor Cd Example of ripple noise measures Figure 3 Example of Ripple Noise Measures Setting of Delay Capacity Please use capacitor Cd for the delay within the range of 10 µF 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 4 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 µF. 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 µs when delay capacitor Cd = 0.1 µF. 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 µs in case of circuit constant C1 = 100 µF. (Characteristic graph 1 is used and extrapolation in case of Cd = 100 µF.) 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) |
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