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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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L6759D 데이터시트(PDF) 38 Page - STMicroelectronics |
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L6759D 데이터시트(HTML) 38 Page - STMicroelectronics |
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38 / 51 page  Main oscillator L6759D 38/51 Doc ID 023240 Rev 1 Figure 14. ROSC vs. FSW per phase (ROSC to GND - left; ROSC to 3.3V - right) 10.1 LSLESS startup and pre-bias output Any time the device resumes from an “OFF” code and at the first power-up, in order to avoid any kind of negative undershoot on the load side, the L6759D performs a special sequence in enabling the drivers: during the soft-start phase, the LS driver results as disabled (LS=OFF - PWMx set to HiZ and ENDRV = 0) until the first PWM pulse. After the first PWM pulse, PWMx outputs switch between logic “0” and logic “1” and ENDRV is set to logic “1”. This particular sequence avoids a 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 the case of overvoltage if needed. Figure 15. LSLESS startup: enabled (left) and disabled (right) |
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