L6598 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6598' PDF : 17 Pages View PDF
L6598
Figure 6. Oscillator/Output Timing Diagram
Cf
HVG
LVG
D98IN897
3 BLOCK’S DIAGRAM DESCRIPTION
3.1 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 size4 Power MOS are used.
The internal logic ensures a minimum dead time to avoid cross-conduction of the power devices.
3.2 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 frequen-
cy shifts from fstart to fmin. This feature is explained in the following description (ref. fig.7 and fig.8).
Figure 7. Soft Start and frequency shifting block
Iss
Ifstart
Ifmin
Iosc
gm
OSC
Css
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