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M51955B Datasheet(PDF) 8 Page - Renesas Technology Corp |
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M51955B Datasheet(HTML) 8 Page - Renesas Technology Corp |
8 / 12 page M51955A,B/M51956A,B REJ03D0777-0200 Rev.2.00 Aug 20, 2007 Page 8 of 11 Power-supply Output Vin M51955 M51956 Input GND VCC1 VCC2 Independent Independent Power-supply Output M51955 M51956 Input GND VCC Vin GND VCC Example 1. Independent power supply system Please do enough verifying about transition characteristic of VCC1 and VCC2. Example 2. Logic pulse input (not recommended) Figure 4 3. Calculation of detecting voltage Detecting voltage Vs can be calculated by the following expression. However, the error margin is caused in the detecting voltage because input current Iin (standard 100 nA) exists if it sets too big resistance. Please set the constant to disregard this error margin. VS = 1.25 × + Iin × R1 error margin R1 + R2 R2 Power-supply Output Vin Iin → M51955 M51956 GND Input VCC R1 R2 Figure 5 Influence of Input Current 4. About the voltage input outside ratings Please do not input the voltage outside ratings to the input terminal. An internal protection diode becomes order bias, and a large current flows. |
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