UCC27523, UCC27524, UCC27525, UCC27526
SLUSAQ3F –NOVEMBER 2011–REVISED MAY 2013
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APPLICATION INFORMATION
High-current gate-driver devices are required in switching power applications for a variety of reasons. In order to
effect fast switching of power devices and reduce associated switching-power losses, a powerful gate-driver
device employs between the PWM output of control devices and the gates of the power semiconductor devices.
Further, gate-driver devices are indispensable when having the PWM controller device directly drive the gates of
the switching devices is sometimes not feasible. With advent of digital power, this situation is often encountered
because the PWM signal from the digital controller is often a 3.3-V logic signal which is not capable of effectively
turning on a power switch. A level-shifting circuitry is needed to boost the 3.3-V signal to the gate-drive voltage
(such as 12 V) in order to fully turn on the power device and minimize conduction losses. Traditional buffer-drive
circuits based on NPN/PNP bipolar transistors in totem-pole arrangement, being emitter-follower configurations,
prove inadequate with digital power because they lack level-shifting capability. Gate-driver devices effectively
combine both the level-shifting and buffer-drive functions. Gate-driver devices also find other needs such as
minimizing the effect of high-frequency switching noise by locating the high-current driver physically close to the
power switch, driving gate-drive transformers and controlling floating power-device gates, reducing power
dissipationx and thermal stress in controller devices by moving gate-charge power losses into the controller.
Finally, emerging wide band-gap power-device technologies such as GaN based switches, which are capable of
supporting very high switching frequency operation, are driving special requirements in terms of gate-drive
capability. These requirements include operation at low VDD voltages (5 V or lower), low propagation delays,
tight delay matching and availability in compact, low-inductance packages with good thermal capability. In
summary gate-driver devices are an extremely important component in switching power combining benefits of
high-performance, low-cost, component-count, board-space reduction and simplified system design.
ENB
UCC2752x
ENA
1
2
3
4
ENA
ENB
OUTA
VDD
8
7
6
5
INA
INA
V+
GND
INB
GND
INB
OUTB
GND
GND
UDG-11225
Figure 27. UCC2752x Typical Application Diagram (x = 3, 4 Or 5)
14
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