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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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VNF1248F Datenblatt(PDF) 34 Page - STMicroelectronics |
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VNF1248F Datenblatt(HTML) 34 Page - STMicroelectronics |
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34 / 79 page  9.1 Control algorithm The following flow charts show the sequence of operations foreseen by CCM control algorithm, for those device states in which load charging is allowed. Figure 10. CCM in unlocked state (1) CCM turn on (CR#1) PWM pulses = max. number? Yes Yes No No VOUT > VOUT threshold? No No Yes Yes Unlocked CCM off Unlocked CCM off VDS < VDS threshold? CCM timeout elapsed? CCM operation (SR#1) status update Normal frequency generation PWM pulses CCM parameters (CR#3, CR#5) configuration Low frequency generation PWM pulses Customer Operation Device Operation Note: (1) Same flow chart in locked mode but it is not possible to perform the first step, CCM parameter configuration (CR#3, CR#5). In this case it needs to configure before enter in the locked state. Figure 11. CCM in fail-safe state CCM turn on (DIN toggling) PWM pulses = max. number? Yes Yes No No VOUT > VOUT threshold? No No Yes Yes Fail-safe CCM off VDS < VDS threshold? CCM timeout elapsed? CCM operation (SR#1) status update Normal frequency generation PWM pulses Low frequency generation PWM pulses Customer Operation Device Operation Fail-safe CCM off VNF1248F Capacitive charging mode–CCM DS14109 - Rev 7 page 34/79 |
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