SG2525A-SG3525A
Figure 8.
Figure 9
.
For single-ended supplies, the driver outputs are
grounded.The V
C
terminal is switched to groundby
the totem-pole source transistors on alternate oscil-
lator cycles.
Figure 10.
In conventional push-pull bipolar designs, forward
base drive is controlled by R
1
- R
3
. Rapid turn-off
times for the power devices are achieved with
speed-up capacitors C
1
and C
2
.
Figure 11.
Thelow source impedanceof the outputdrivers pro-
vides rapid charging of Power Mos input capaci-
tance while minimizing external components.
Low power transformers can be driven directly.
Automaticresetoccurs duringdeadtime, whenboth
ends of the primary winding are switched to ground.
9/12
STMICROELECTRONICS [ STMICROELECTRONICS ]
