ISL89367FRTAZ【PDF 1/14 页】IC MOSFET DRIVER 2CH 6A 16TDFN

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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.

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

Features

? 2 outputs with 6A peak drive currents (sink and source) with

output voltage range of 4.5V to 16V

? Typical ON-resistance <1 ?

? 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

? Flexible logic options available by use of INVA and INVB pins

Applications

? Synchronous Rectifier (SR) Driver

? Switch mode power supplies

? Motor Drives, Class D amplifiers, UPS, Inverters

? Pulse Transformer Driver

? Clock/Line Driver

Related Literature

? AN1603 “ISL6752/54EVAL1Z ZVS DC/DC Power Supply with

Synchronous Rectifiers User Guide”

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.

350

3.3V

300

ENABLE

VREF+

INVA

FDELA

RDELA

250

200

+125°C (WORST CASE)

12V

/OUTA

OUTB

150

+25°C (TYPICAL)

PWM

INVB

GND

RDELB

FDELB

100

-40°C (WORST CASE)

VREF-

RDT (2k TO 20k)

FIGURE 1. TYPICAL APPLICATION

FIGURE 2. PROGRAMMABLE TIME DELAYS

October 8, 2012

FN7727.1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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.

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