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AN3392 Datasheet(PDF) 20 Page - STMicroelectronics |
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AN3392 Datasheet(HTML) 20 Page - STMicroelectronics |
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20 / 57 page  SPV1020 functions AN3392 20/57 Doc ID 018749 Rev 1 Figure 19. Normal/MPPT mode, DCM vs. CM FSM In the case of DCM, input current can be negligible and its sampled value may be strongly affected by the noise caused by the switching elements. Input power is computed as follows, avoiding the use of the input current: Equation 4 In the case of CM, input power is computed by multiplying the sampled voltage and the sampled current: Equation 5 Input voltage is sampled by an external resistive divider, while the input current is sampled internally to reduce the number of external components in the application. Figure 20 shows a simple schematic of the input voltage sensing circuitry (see Section 10 for values of the components shown). P tn () V 2 T on T on T off + () ⋅⋅ = P tn () VI ⋅ = |
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