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XC9223D81DR Datasheet(PDF) 11 Page - Torex Semiconductor |
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XC9223D81DR Datasheet(HTML) 11 Page - Torex Semiconductor |
11 / 25 page 11/25 XC9223/XC9224 Series ■OPERATIONAL EXPLANATION (Continued) <PFM Switch Current> In PFM control operation, until coil current reaches to a specified level (IPFM), the IC keeps the P-ch MOSFET on. In this case, time that the P-ch MOSFET is kept on (TON) can be given by the following formula. TON= L ×IPFM (VIN−VOUT) →IPFM① <Maximum IPFM Limit> In PFM control operation, the maximum duty cycle (MAXPFM) is set to 50% (TYP.). Therefore, under the condition that the duty increases (e.g. the condition that the step-down ratio is small), it’s possible for P-ch MOSFET to be turned off even when coil current doesn’t reach to IPFM. →IPFM② IPFM ① Ton Lx I Lx IPFM 0mA IPFM ② IPFM 0mA Lx I Lx FOSC Maxumum IPFM Current |
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