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ISL6557ACB-T Datasheet(PDF) 11 Page - Intersil Corporation |
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ISL6557ACB-T Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 19 page 11 To enable the controller, VCC must be greater than the POR threshold; the voltage on EN must be greater than 1.23V and VID cannot be equal to 11111. Once these conditions are true, the controller immediately initiates a soft start sequence. SOFT-START The soft-start time, tSS, is determined by an 11-bit counter that increments with every pulse of the phase clock. For example, a converter switching at 250kHz has a soft-start time of T SS 2048 f SW ------------- 8.2ms == (EQ. 5) ISL6557A |
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Similar Description - ISL6557ACB-T |
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