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MC34280 Datasheet(PDF) 11 Page - ON Semiconductor |
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MC34280 Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 20 page MC34280 http://onsemi.com 11 DETAILED OPERATING DESCRIPTION (Cont’d) Figure 20. Simplified Block Diagram of Main Regulator +ve Edge Delay R S Q R S Q Qb 1–SHOT VBAT Voltage Reference Main Regulator with Synchronous Rectifier Voltage Reference & Current Bias AGND 1.22 V 0.5 V x2 RIref 480 kOhm VMAINFB CMAINb 100 pF VCOMP for Min. OFF Time AGND ILIM DGND VDD RMAINb 1000 kOhm L1 33uH CMAIN 100 uF VMAINSW VMAINGND DGND VDD M1 M2 senseFET Iref 2 x Iref ZLC for Max. ON Time COMP2 COMP3 COMP1 VMAIN + 30 32 31 1 8 IREF In Figure 22, regulator is operating at Discontinuous Conduction Mode, waveforms are similar to those of Figure 21. However, coil current drops to zero before next switching cycle starts. To estimate conduction mode, below equation can be used. Iroom + h T ON Vin2 2 L Vout * I LOAD where, η is efficiency, refer to Figure 6 if Iroom > 0, the regulator is at Discontinuous Conduction mode if Iroom = 0, the regulator is at Critical Conduction mode where coil current just drops to zero and next cycle starts. if Iroom < 0, the regulator is at Continuous Conduction mode For Continuous Conduction mode, provided that current limit is not reached, T SW + T ON 1 * h Vin Vout (S); I pk + I LOAD 1 * T ON T SW ) Vin T ON 2 L (A) For Discontinuous Conduction mode, provided that current limit is not reached, T SW + Vin @T 2 ON 2 @ L @ I LOAD @ Vout h@Vin * 1 (S); I pk + Vin L @ T ON (A) |
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