L6699DTR STMicroelectronics, L6699DTR Datasheet - Page 16

• Manufacturer Part Number: L6699DTR
• Description: AC/DC Switching Converters Enhanced High Volt Res CTRL 600V
• Manufacturer: STMicroelectronics

Specifications of L6699DTR

• Product Category: AC/DC Switching Converters

Application information
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Note that the “Driving logic…” block sets a minimum deadtime T
which T
switch, and also a maximum deadtime T
bridge. T
whichever is shorter.
Figure 9.
The actual deadtime T
adjustment circuit of
image shown in
It illustrates a detailed view of the low-to-high transition of the half bridge midpoint
(waveform labeled HB) along with the high-side gate-drive (HVG), the low-side gate-drive
(LVG) and the oscillator voltage on pin CF (OSC). Obviously, the information that follows
applies to the high-to-low transition as well.
Figure 7.
D
D_MAX
cannot go, to prevent simultaneous conduction of the high-side and the low-side
Detailed view of deadtime during low-to-high transition of half bridge
midpoint
Adaptive deadtime: principle
schematic
is internally set at either 700 ns or one fourth of the oscillator cycle,
Figure 9
Figure 7
D
that can be observed during operation does not depend only on the
.
. This fact can be explained with the aid of the oscilloscope
Doc ID 022835 Rev 2
D_MAX
Figure 8.
to guarantee proper operation of the half
Relevant timing diagrams
D_MIN
(≈ 230 ns) below
L6699