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L6598D Datasheet(PDF) 9 Page - STMicroelectronics |
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L6598D Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 24 page L6598 Block diagram description Doc ID 6554 Rev 7 9/24 5 Block diagram description 5.1 High/low side driving section An high and low side driving section provide the proper driving to the external power MOS or IGBT. An high sink/source driving current (450/250 mA typ) ensure fast switching times also when size for power MOS are used. The internal logic ensures a minimum dead time to avoid cross-conduction of the power devices. 5.2 Timing and oscillator section The device is provided of a soft start function. It consists in a period of time, TSS, in which the switching frequency shifts from fstart to fmin. This feature is explained in the following description (ref. fig.7 and fig.8). Figure 6. Soft start and frequency shifting block During the soft start time the current ISS charges the capacitor CSS, generating a voltage ramp which is delivered to a transconductance amplifier, as shown in fig. 7. Thus this voltage signal is converted in a growing current which is subtracted to Ifstart. Therefore the current which drives the oscillator to set the frequency during the soft start is equal to: Equation 1 Equation 2 I osc I fmin I fstart g mVCss t () – () + I fmin I fstart g mIss C ss -------------- – ⎝⎠ ⎛⎞ + == where I fmin V REF R fmin -------------- I fstart V REF R fstart ---------------- V REF 2V = , = , = |
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