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TC7660COA Scheda tecnica(PDF) 7 Page - Microchip Technology |
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TC7660COA Scheda tecnica(HTML) 7 Page - Microchip Technology |
7 / 18 page © 2005 Microchip Technology Inc. DS21486C-page 7 TCM680 4.5 Maximum Operating Limits The maximum input voltage rating must be observed. The TCM680 will clamp the input voltage to 5.8V. Exceeding this maximum threshold will cause exces- sive current to flow through the TCM680, potentially causing permanent damage to the device. 4.6 Switched Capacitor Converter Power Losses The overall power loss of a switched capacitor converter is affected by four factors: 1. Losses from power consumed by the internal oscillator, switch drive, etc. These losses will vary with input voltage, temperature and oscillator frequency. 2. Conduction losses in the non-ideal switches. 3. Losses due to the non-ideal nature of the external capacitors. 4. Losses that occur during charge transfer from the pump to reservoir capacitors when a voltage difference between the capacitors exists. The power loss for the TCM680 is calculated using the following equation: EQUATION PLOSS = (IOUT+) 2 X R OUT - + (I OUT-) 2 X R OUT + + I IN X VIN |
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