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XCL211 Datasheet(PDF) 9 Page - Torex Semiconductor |
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XCL211 Datasheet(HTML) 9 Page - Torex Semiconductor |
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9 / 16 page  9/16 XCL211/XCL212 Series ■ OPERATIONAL DESCRIPTION (Continued) <PFM Switch Current> (*1) In PFM control operation, until coil current reaches to a specified level (IPFM), the IC keeps the P-channel MOS driver transistor on. In this case, time that the P-channel MOS driver transistor is kept on (tON) can be given by the following formula. Please refer to IPFM① tON = L × IPFM / (VIN - VOUT) <PFM Duty Limit> (*1) In PFM control operation, the PFM duty limit (DTYLIMIT_PFM) is set to 200% (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-channel MOS driver transistor to be turned off even when coil current doesn’t reach to IPFM. Please refer to IPFM② (*1) XCL211 Series is excluded. Fig. Fig. |
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