ISL89367 Datasheet, PDF (1/13 Pages) Intersil Corporation – High Speed, Dual Channel, 6A, MOSFET Driver With Programmable Rising and Falling Edge Delay Timers

High Speed, Dual Channel, 6A, MOSFET Driver With
Programmable Rising and Falling Edge Delay Timers
ISL89367
The ISL89367 is a high-speed, 6A, 2 channel MOSFET driver
optimized for synchronous rectifier applications. Internal timers
can be programmed with resistors to delay the rising and/or
falling edges of the outputs. Logically ANDed dual inputs are also
provided. One input is for the PWM signal and the second can be
used as an enable. A third control input is used to optionally
invert the logical polarity of the driver outputs.
Comparator like logical inputs allows this driver to be configured
for any logic level from 3.3V to 10 VDC. The precision logic
thresholds provided by the comparators allow the use of external
RC circuits to generate longer time delays than are possible with
the internal timers. The comparators also allow the driver to be
configured with a low output voltage that is negative relative to
the logic ground if desired. This is useful for applications that
require a negative turn-off gate drive voltage for driving FETs with
logic thresholds.
At high switching frequencies, these MOSFET drivers use very
little bias current. Separate, non-overlapping drive circuits are
used to drive each CMOS output FET to prevent shoot-thru
currents in the output stage.
An under voltage lockout (UV) insures that the driver outputs
remain off (low) during turn-on until V_DD is sufficiently high for
correct logic control. This prevents unexpected behavior when
VDD bias is being applied or removed.
Features
• 2 outputs with 6A peak drive currents (sink and source) with
output voltage range of 4.5V to 16V.
• Typical ON-resistance ~1Ω.
• Specified Miller plateau drive currents.
• EPAD provides very low thermal impedance (θ_JC = 3°C/W).
• Dual logic inputs with hysteresis for high noise immunity.
• Rising and/or falling output edge delays programmed with
resistors.
• ~ 20ns rise and fall time driving a 10nF load.
• Low operating bias currents
Applications
• Synchronous Rectifier (SR) Driver
• Switch mode power supplies
• Motor Drives, Class D amplifiers, UPS, Inverters
• Pulse Transformer Driver
• Clock/Line Driver
3.3V
ENABLE ^VREF+
INVA
PWM
INVB
VREF-
FDELA
RDELA
12V
/OUTA
OUTB
GND
RDELB
FDELB
FIGURE 1. TYPICAL APPLICATION
350
300
250
+125°C (WORST CASE)
200
150
+25°C (TYPICAL)
100
50
-40°C (WORST CASE)
0
0
5
10
15
20
RDT (2k to 20k)
FIGURE 2. PROGRAMMABLE TIME DELAYS
January 31, 2011
1
FN7727.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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