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CPC1580P Datasheet(PDF) 10 Page - Clare, Inc. |
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CPC1580P Datasheet(HTML) 10 Page - Clare, Inc. |
10 / 11 page CPC1580 10 www.clare.com R00G 6. Design Switching Frequency The maximum switching frequency is the last design value to be calculated, because the over-voltage protection and the storage capacitor play a significant role in determining the result. Inasmuch as those factors are already determined, the following gives a good approximation for the maximum switching frequency. The maximum switching frequency is a function of the gate charge of the MOSFET, the storage capacitor (CST), and ROVP. The maximum switching frequency relationship in Hz is: Where: • M=3 (multiplication factor for temperature and pro- cess variations • t ON and tOFF are CPC1580 data sheet parameters • t RISE, VD is the rise time of the drain voltage and tCHG is the charge time of the storage capacitor and the over-voltage protection circuitry as derived in Section 3.2: choose the greater of tRISE,VD or tCHG for the calculation • t FALL,VD is the fall time across the transistor There is no minimum switching frequency since the CPC1580 uses photovoltaic diodes to keep the output charged while LED current flows. FMAX < 1 M • (tON + tOFF + (tRISE,VD | tCHG) + tFALL,VD) -1 |
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