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CBC3150-D9C-TR1 Datasheet(PDF) 11 Page - Cymbet Corporation |
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CBC3150-D9C-TR1 Datasheet(HTML) 11 Page - Cymbet Corporation |
11 / 15 page EnerChip CC CBC3150 ©2009-2010 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com DS-72-03 Rev C Page 11 of 15 To determine the backup switchover hysteresis for Mode 2 operation, use Figure 9. Figure 8: Mode 2 Resistor Selection Graph Figure 9: Mode 2 Hysteresis as a Function of R2/R1 Battery Switchover Threshold Voltage vs. R2/R1 Ratio 0 1 2 3 4 5 6 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 R2/R1 Ratio Trip point Hysteresis in Battery Switchover Threshold Voltage vs. R2/R1 Ratio 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 R2/R1 Ratio Hysteresis EnerChip charging and backup power switchover threshold for 2.5 to 5.5 volt operation is selected by changing the value of R2 (see Figure 7). To determine the backup switchover point, set the value of R1 to 200kΩ and choose the value of R2 according to Figure 8. For example, to set a 3.0V trip point: If R1=200 kΩ then R2 = R1 x 0.72 = 144kΩ. Figure 7 shows a Mode 2 circuit with standard value resistors of 200kΩ and 143kΩ. |
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