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L6756D データシート(PDF) 25 Page - STMicroelectronics |
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L6756D データシート(HTML) 25 Page - STMicroelectronics |
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25 / 36 page  L6756D Output voltage positioning 25/36 5.6.1 LSLESS start-up In order to avoid any kind of negative undershoot on the load side during start-up, L6756D performs a special sequence in enabling the drivers for both sections: during the soft-start phase, the LS driver results to be disabled (LS = OFF - Gx set to HiZ and DRVON = 0) until the first PWM pulse. After the first PWM pulse, Gx outputs switches between logic “0” and logic “1” and DRVON is set to logic “1”. This particular sequence avoids the dangerous negative spike on the output voltage that can happen if starting over a pre-biased output. Low-side MOSFET turn-on is masked only from the control loop point of view: protections are still allowed to turn-ON the low-side MOSFET in case of overvoltage if needed. Figure 10. LSLESS start-up: enabled (left) and disabled (right) |
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