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High Speed, Dual Channel, 6A, Power MOSFET Driver
With Programmable Delays
ISL89166, ISL89167, ISL89168
The ISL89166, ISL89167, and ISL89168 are high-speed, 6A,
dual channel MOSFET drivers. These parts are similar to the
ISL89160, ISL89161, ISL89162 drivers but use the NC pins for
programming the rising edge time delays of the outputs used for
dead time control.
As an alternative to using external RC circuits for time delays, the
programmable delays on the RDTA and RDTB pins allows the
user to delay the rising edge of the respective outputs just by
connecting an appropriate resistor value between these pins and
ground. The accuracy and temperature characteristics of the
time delays are specified freeing the user of the need to select
appropriate external resistors and capacitors that traditionally
are applied to the logic inputs to delay the output edges.
At high switching frequencies, these MOSFET drivers use very
little internal bias currents. Separate, non-overlapping drive
circuits are used to drive each CMOS output FET to prevent
shoot-thru currents in the output stage.
The start-up sequence is design to prevent unexpected glitches
when V
DD
is being turned on or turned off. When V
DD
< ~1V, an
internal 10k resistor between the output and ground helps to
keep the output voltage low. When ~1V <V
DD
< UV, both outputs
are driven low with very low resistance and the logic inputs are
ignored. This insures that the driven FETs are off. When
V
DD
> UVLO, and after a short delay, the outputs now respond to
the logic inputs.
Features
•Typical ON-resistance <1
• Specified Miller plateau drive currents
• Very low thermal impedance (
JC
= 3°C/W)
• Hysteretic Input logic levels for 3.3V CMOS, 5V CMOS, and TTL
• Precision threshold inputs for optional time delays with
external RC components
• Instead of RC components for time delays, a resistor can be
used to program delays
• 20ns rise and fall time driving a 10nF load.
• NC pins may be connected to ground or VDD for flexible PCB
layout options
Applications
• Synchronous Rectifier (SR) Driver
• Switch mode power supplies
• Motor Drives, Class D amplifiers, UPS, Inverters
• Pulse Transformer Driver
• Clock/Line Driver
8
6
7
1
4
3
2
5
EPAD
V
DD
4.7µF
RDTBRDTA
INA
INB
GND
OUTA
OUTB
FIGURE 1. TYPICAL APPLICATION
0
50
100
150
200
250
300
350
0 5 10 15 20
DELAY (ns)
RDT (2k to 20k)
FIGURE 2. PROGRAMMABLE TIME DELAYS
-40°C (WORST CASE)
+25°C (TYPICAL)
+125°C (WORST CASE)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|Copyright Intersil Americas LLC 2011-2013. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
February 26, 2013
FN7720.2
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