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L6728HTR Arkusz danych(PDF) 11 Page - STMicroelectronics |
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L6728HTR Arkusz danych(HTML) 11 Page - STMicroelectronics |
11 / 32 page Obsolete Product(s) - Obsolete Product(s) L6728H Soft-start Doc ID 15725 Rev 1 11/32 7 Soft-start L6728H implements a soft-start to smoothly charge the output filter avoiding high in-rush currents to be required from the input power supply. The device gradually increases the internal reference from 0 V to 0.8 V in 4.5 ms (typ.), in closed loop regulation, linearly charging the output capacitors to the final regulation voltage. In the event of an over current triggering during soft start, the over current logic will override the soft start sequence and will shut down the PWM logic and both the high side and low side gates. This condition is latched, cycle VCC to recover. The device begins soft start phase only when VCC power supply is above UVLO threshold and over current threshold setting phase has been completed. 7.1 Low-side-less startup (LSLess) In order to avoid any kind of negative undershoot and dangerous return from the load during start-up, L6728H performs a special sequence in enabling LS driver to switch: during the soft-start phase, the LS driver results disabled (LS = OFF) until the HS starts to switch. This avoid the dangerous negative spike on the output voltage that can happen if starting over a pre-biased output. If the output voltage is pre-biased to a voltage higher than the final one, the HS would never start to switch. In this case, at the end of soft start time, LS is enabled and discharge the output to the final regulation value. This particular feature of the device masks the LS turn-on only from the control loop point of view: protections by-pass this turning ON the LS MOSFET in case of need. Figure 4. LSLess startup (left) vs non-LSLess startup (right) |
Podobny numer części - L6728HTR |
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Podobny opis - L6728HTR |
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