L6598_04 STMICROELECTRONICS [STMicroelectronics], L6598_04 Datasheet - Page 6

• Manufacturer Part Number: L6598_04
• Description: HIGH VOLTAGE RESONANT CONTROLLER
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

L6598
Figure 6. Oscillator/Output Timing Diagram
C f
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, T
, in which the switching frequen-
SS
cy shifts from f
to f
. This feature is explained in the following description (ref. fig.7 and fig.8).
start
min
Figure 7. Soft Start and frequency shifting block
Iss
Ifstart
Ifmin
Iosc
gm
OSC
Css
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