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L6360 データシート(PDF) 37 Page - STMicroelectronics |
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L6360 データシート(HTML) 37 Page - STMicroelectronics |
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37 / 65 page  L6360 Device configuration Doc ID 022817 Rev 2 37/65 6.3 Demagnetization The power stage can be represented as in Figure 19. Figure 19. Power stage. Q2 is not present on L+ output When a power stage output (C/Q or L+) is connected to an inductance, the energy stored in the load is: Equation 1 This energy must be properly dissipated at the switch-off. Without an appropriate circuitry the output voltage would be pulled to very negative values, therefore recovering the stored energy through the power transistor's breakdown. To avoid this, the output voltage must be clamped so that the voltage across the power switch does not exceed its breakdown voltage. In the case of load connected between the C/QO pin and VCC, at switch-off (of the low-side switch) the output is pushed to a voltage higher than VCC. E 1 2 ---LI 2 = |
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