application
INFO
UC1714/5
UC2714/5
UC3714/5
available
Complementary Switch FET Drivers
FEATURES
DESCRIPTION
• Single Input (PWM and TTL
These two families of high speed drivers are designed to provide drive
waveforms for complementary switches. Complementary switch configura-
tions are commonly used in synchronous rectification circuits and active
clamp/reset circuits, which can provide zero voltage switching. In order to
facilitate the soft switching transitions, independently programmable delays
between the two output waveforms are provided on these drivers. The de-
lay pins also have true zero voltage sensing capability which allows imme-
diate activation of the corresponding switch when zero voltage is applied.
These devices require a PWM-type input to operate and can be interfaced
with commonly available PWM controllers.
Compatible)
• High Current Power FET Driver, 1.0A
Source/2A Sink
• Auxiliary Output FET Driver, 0.5A
Source/1A Sink
• Time Delays Between Power and
Auxiliary Outputs Independently
Programmable from 50ns to 500ns
In the UC1714 series, the AUX output is inverted to allow driving a
p-channel MOSFET. In the UC1715 series, the two outputs are configured
in a true complementary fashion.
• Time Delay or True Zero-Voltage
Operation Independently Configurable
for Each Output
• Switching Frequency to 1MHz
• Typical 50ns Propagation Delays
• ENBL Pin Activates 220µA Sleep
Mode
• Power Output is Active Low in Sleep
Mode
• Synchronous Rectifier Driver
BLOCK DIAGRAM
2
PWR
50ns –500ns
TIMER
INPUT
T1
6
7
S
Q
R
UC1714
ONLY
V
REF
4
1
AUX
VCC
50ns –500ns
TIMER
S
Q
V
5V
BIAS
ENBL
LOGIC
GATES
CC
T2
5
R
V
REF
TIMER
REF
3V
GND
3
GND
1.4V
ENBL
8
ENABLE
Note: Pin numbers refer to J, N and D packages.
UDG-99028
SLUS170A - FEBRUARY 1999 - REVISED JANUARY 2002